fix: adding new files w/ rollup shouldn't error

[tivac]

Fixes #421 by making the result of Processor.remove() always an array instead of sometimes null.

[TravisBuddy]

Travis tests have failed

Hey @tivac,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: 6

npm test -- --coverage --verbose --ci

> modular-css-root@0.0.0 test /home/travis/build/tivac/modular-css
> jest "--coverage" "--verbose" "--ci"

PASS packages/core/test/options.test.js
  /processor.js
    options
      cwd
        ✓ should use an absolute path (715ms)
        ✓ should accept a relative path but make it absolute (4ms)
      namer
        ✓ should use a custom naming function (8ms)
        ✓ should require a namer if a string is passed (37ms)
        ✓ should use the default naming function if a non-function is passed (3ms)
      map
        ✓ should generate source maps (52ms)
        ○ skipped 1 test
      exportGlobals
        ✓ should not export :global values when exportGlobals is false (5ms)
      rewrite
        ✓ should rewrite url() references by default (7ms)
        ✓ should not rewrite url() references when falsey (3ms)
        ✓ should pass through to postcss-url as config (27ms)
      lifecycle options
        before
          ✓ should run sync postcss plugins before processing (4ms)
          ✓ should run async postcss plugins before processing (6ms)
        processing
          ✓ should run sync postcss plugins processing processing (2ms)
          ✓ should run async postcss plugins processing processing (4ms)
          ✓ should include exports from 'modular-css-export' modules (2ms)
        after
          ✓ should use postcss-url by default (4ms)
          ✓ should run sync postcss plugins (4ms)
          ✓ should run async postcss plugins (4ms)
        done
          ✓ should run sync postcss plugins done processing (3ms)
          ✓ should run async postcss plugins done processing (5ms)
          ✓ should work with cssnano (no preset) (1057ms)
          ��� should work with cssnano (default preset) (16ms)

PASS packages/rollup/test/rollup.test.js
  /rollup.js
    ✓ should be a function (7ms)
    ✓ should generate exports (84ms)
    ✓ should be able to tree-shake results (12ms)
    ✓ should attach a promise to the bundle.generate response (9ms)
    ✓ should generate CSS (19ms)
    ✓ should generate JSON (9ms)
    ✓ should provide named exports (9ms)
    ✓ should generate external source maps (7ms)
    ✓ should warn & not export individual keys when they are not valid identifiers (9ms)
    ✓ should allow disabling of named exports (7ms)
    ✓ shouldn't disable sourcemap generation (13ms)
    ✓ should not output sourcemaps when they are disabled (13ms)
    ✓ should respect the CSS dependency tree (17ms)
    errors
      ✓ should throw errors in in before plugins (5ms)
      ✓ should throw errors in after plugins (7ms)
      ○ skipped 1 test
    watch
      ✓ should generate correct builds in watch mode when files change (315ms)
      ✓ should correctly update files within the dependency graph in watch mode when files change (315ms)
      ✓ should correctly add new css files in watch mode when files change (314ms)

PASS packages/core/test/api.test.js
  /processor.js
    API
      ✓ should be a function (19ms)
      ✓ should auto-instantiate if called without new (1ms)
      .string()
        ✓ should process a string (9ms)
      .file()
        ✓ should process a relative file (5ms)
        ✓ should process an absolute file (3ms)
      .remove()
        ✓ should remove a relative file (2ms)
        ✓ should remove an absolute file (1ms)
        ✓ should remove multiple files (18ms)
        ✓ should remove dependant files (16ms)
        ✓ should return an array of removed files (3ms)
      .dependencies()
        ✓ should return the dependencies of the specified file (11ms)
        ✓ should return the overall order of dependencies if no file is specified (12ms)
      .output()
        ✓ should return a postcss result (15ms)
        ✓ should generate css representing the output from all added files (12ms)
        ✓ should avoid duplicating files in the output (11ms)
        ✓ should generate a JSON structure of all the compositions (12ms)
        ✓ should order output by dependencies, then alphabetically (21ms)
        ✓ should support returning output for specified relative files (21ms)
        ✓ should support returning output for specified absolute files (9ms)
        ✓ should reject if called before input has been processed (6ms)
        ✓ should allow for seperate source map output (21ms)
      ._resolve()
        ✓ should run resolvers until a match is found (2ms)
        ✓ should fall back to a default resolver (2ms)

(node:6125) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
PASS packages/webpack/test/webpack.test.js
  /webpack.js
    ✓ should be a function (3ms)
    ✓ should output css to disk (490ms)
    ✓ should output json to disk (54ms)
    ✓ should output inline source maps (33ms)
    ✓ should output external source maps to disk (43ms)
    ✓ should report errors (96ms)
    ✓ should report warnings on invalid property names (35ms)
    ✓ should handle dependencies (61ms)
    ✓ should support ES2015 default exports (31ms)
    ✓ should support ES2015 named exports (30ms)
    ✓ should support disabling namedExports when the option is set (38ms)
    ✓ should generate correct builds in watch mode when files change (460ms)
    ✓ should generate correct builds when files change (60ms)

PASS packages/browserify/test/factor-bundle.test.js
  /browserify.js
    factor-bundle
      ✓ should be supported (226ms)
      ✓ should support files w/o commonalities (62ms)
      ✓ should properly handle files w/o dependencies (78ms)
      ✓ should support relative paths within factor-bundle files (71ms)
      ✓ should avoid outputting empty css files by default (70ms)
      ✓ should output empty css files when asked (67ms)

PASS packages/browserify/test/browserify.test.js
  /browserify.js
    basic functionality
      ✓ should not error if no options are supplied (19ms)
      ✓ should error if an invalid extension is applied (14ms)
      ✓ should error on invalid CSS (19ms)
      ✓ should replace require() calls with the exported identifiers (42ms)
      ✓ should correctly rewrite urls based on the destination file (41ms)
      ✓ should use the specified namer function (44ms)
      ✓ should include all CSS dependencies in output css (52ms)
      ✓ should write out the complete exported identifiers when `json` is specified (37ms)
      ✓ should not include duplicate files in the output multiple times (51ms)
      ✓ should output an inline source map when the debug option is specified (57ms)
      ✓ should output an external source map when the debug option is specified (47ms)

PASS packages/core/test/composition.test.js
  /processor.js
    composition
      ✓ should fail on invalid composes syntax (20ms)
      ✓ should fail if a composition references a non-existant class (3ms)
      ✓ should fail if a composition references a non-existant file (2ms)
      ✓ should fail if composes isn't the first property (2ms)
      ✓ should fail on rules that use multiple selectors (3ms)
      ✓ should compose a single class (3ms)
      ✓ should allow comments before composes (4ms)
      ✓ should compose from globals (4ms)
      ✓ should compose multiple classes (4ms)
      ✓ should compose from other files (9ms)

PASS packages/browserify/test/watchify.test.js
  /browserify.js
    watchify
      ✓ shouldn't cache file contents between watchify runs (270ms)
      ✓ shouldn't explode on invalid CSS (170ms)

PASS packages/postcss/test/postcss.test.js
  /postcss.js
    ✓ should be a function (1ms)
    ✓ should process CSS and output the result (34ms)
    ✓ should process CSS with dependencies and output the result (22ms)
    ✓ should process CSS and output exports as a message (3ms)
    ✓ should accept normal processor options (9ms)
    ✓ should accept a `json` property and write exports to that file (16ms)
    ✓ should be usable like a normal postcss plugin (5ms)
    ✓ should output json when used within postcss (5ms)
    ✓ should accept json args in either position with postcss (4ms)

PASS packages/core/test/values.test.js
  /processor.js
    values
      ✓ should fail on invalid value syntax (16ms)
      ✓ should fail if a value imports a non-existant reference (2ms)
      ✓ should support simple values (4ms)
      ✓ should support local values in value composition (11ms)
      ✓ should support importing variables from a file (8ms)
      ✓ should support exporting imported variables (10ms)
      ✓ should support value composition (5ms)
      ✓ should support value namespaces (6ms)
      ✓ should support value replacement in :external(...) (23ms)

PASS packages/aliases/test/aliases.test.js
  modular-css-aliases
    ✓ should return a falsey value if a file isn't found (4ms)
    ✓ should return the absolute path if a file is found (1ms)
    ✓ should check multiple aliases for files & return the first match (2ms)
    ✓ should be usable as a modular-css resolver (32ms)
    ✓ should fall through to the default resolver (9ms)

PASS packages/core/test/scoping.test.js
  /processor.js
    scoping
      ✓ should scope classes, ids, and keyframes (23ms)
      ✓ should handle pseudo classes correctly (6ms)
      ✓ should not allow :global classes to overlap with local ones (local before global) (3ms)
      ✓ should not allow :global classes to overlap with local ones (global before local) (16ms)
      ✓ should not allow empty :global() selectors (2ms)

PASS packages/core/test/keyframes.test.js
  /processor.js
    scoping
      ✓ should leave unknown animation names alone (17ms)
      ✓ should update scoped animations from the scoping plugin's message (4ms)
      ✓ should update the animation-name property (4ms)
      ✓ should update multiple animations properly (3ms)
      ✓ should update scoped prefixed animations from the scoping plugin's message (2ms)

PASS packages/browserify/test/issue-313.test.js
  /browserify.js
    /issues
      /313
        ✓ should include all dependencies after watchify update (223ms)

PASS packages/browserify/test/issue-58.test.js
  /browserify.js
    /issues
      /58
        ✓ should update when CSS dependencies change (234ms)

FAIL packages/cli/test/cli.test.js
  /cli.js
    ✕ should show help with no args (90ms)
    ✕ should default to outputting to stdout (86ms)
    ✕ should support outputting to a file (--out) (78ms)
    ✕ should support outputting compositions to a file (--json) (90ms)
    ✕ should return the correct error code on invalid CSS (81ms)
    ✕ should support disabling url() rewriting (--no-rewrite) (79ms)

  ● /cli.js › should show help with no args

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should default to outputting to stdout

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting to a file (--out)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting compositions to a file (--json)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should return the correct error code on invalid CSS

    expect(received).toMatch(expected)
    
    Expected value to match:
      "Invalid composes reference"
    Received:
      "module.js:478
        throw err;
        ^
    
    Error: Cannot find module 'modular-css-glob'

       6 |     
       7 |     mkdirp = require("mkdirp"),
    >  8 |     glob = require("modular-css-glob"),
       9 |     cli = require("meow")(`
      10 |         Usage
      11 |         $ modular-css [options] <glob>...
      
      at Object.<anonymous> (packages/cli/cli.js:8:12)
      at Function.Module._load (module.js:445:3)"
      at tester.then.out (packages/cli/test/cli.test.js:62:32)

  ● /cli.js › should support disabling url() rewriting (--no-rewrite)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

PASS packages/svelte/test/svelte.test.js
  /svelte.js
    ✓ should generate exports (67ms)
    ✓ should ignore files without <style> blocks (5ms)
    ✓ should ignore invalid {css.<key>} (3ms)

PASS packages/paths/test/paths.test.js
  modular-css-paths
    ✓ should return a falsey value if a file isn't found (2ms)
    ✓ should return the absolute path if a file is found (1ms)
    ✓ should check multiple paths for files & return the first match
    ✓ should be usable as a modular-css resolver (29ms)

PASS packages/svelte/test/rollup.test.js
  /rollup.js
    ✓ should generate exports (260ms)
    ✓ should not generate exports (114ms)

PASS packages/core/test/externals.test.js
  /processor.js
    externals
      ✓ should fail if not a valid composition reference (18ms)
      ✓ should fail if not referencing another file (2ms)
      ✓ should fail on bad class references (7ms)
      ✓ should support overriding external values (22ms)

PASS packages/namer/test/index.test.js
  modular-css-namer
    ✓ should hash its arguments (2ms)
    ✓ should differ within files (1ms)
    ✓ should re-use selectors for identical inputs (1ms)
    ✓ should differ between files (1ms)
    ✓ should wrap as necessary (170ms)

PASS packages/glob/test/glob.test.js
  /glob.js
    ✓ should be a function (1ms)
    ✓ should use a default search (46ms)
    ✓ should find files on disk & output css (11ms)
    ✓ should support exclusion patterns (11ms)

PASS packages/core/test/exports.test.js
  /processor.js
    exports
      ✓ should export an object of arrays containing strings (24ms)
      ✓ should export identifiers and their classes (17ms)

PASS packages/core/test/getters.test.js
  /processor.js
    getters
      .file
        ✓ should return all the files that have been added (51ms)
      .options
        ✓ should return the merged options object (1ms)

PASS packages/core/test/issues/issue-56.test.js
  /issues
    /56
      ✓ should prune rules that only compose, but leave them in the exports (27ms)

PASS packages/core/test/issues/issue-24.test.js
  /issues
    /24
      ✓ should be able to compose using a value (45ms)

PASS packages/core/test/issues/issue-98.test.js
  /issues
    /98
      ✓ should prune rules that only compose, but leave them in the exports (18ms)

PASS packages/core/test/unicode.test.js
  /processor.js
    unicode
      ✓ should support unicode classes & ids (39ms)

PASS packages/core/test/issues/issue-66.test.js
  /issues
    /66
      ✓ should ignore remove calls for unknown files (18ms)

PASS packages/core/test/issues/issue-261.test.js
  /issues
    /261
      ✓ should allow colons in rules that also use :external() (24ms)

-----------------------|----------|----------|----------|----------|-------------------|
File                   |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
-----------------------|----------|----------|----------|----------|-------------------|
All files              |    99.11 |       95 |    98.55 |    99.09 |                   |
 aliases               |      100 |      100 |      100 |      100 |                   |
  aliases.js           |      100 |      100 |      100 |      100 |                   |
 browserify            |    97.78 |    94.44 |    95.83 |    97.78 |                   |
  browserify.js        |    97.78 |    94.44 |    95.83 |    97.78 |            71,173 |
 browserify/test/lib   |      100 |      100 |      100 |      100 |                   |
  bundle.js            |      100 |      100 |      100 |      100 |                   |
 core                  |      100 |      100 |      100 |      100 |                   |
  processor.js         |      100 |      100 |      100 |      100 |                   |
 core/lib              |    98.53 |    91.67 |      100 |    98.48 |                   |
  graph-tiers.js       |    96.43 |    83.33 |      100 |     96.3 |                27 |
  identifiers.js       |      100 |      100 |      100 |      100 |                   |
  message.js           |      100 |      100 |      100 |      100 |                   |
  output.js            |      100 |      100 |      100 |      100 |                   |
  relative.js          |      100 |      100 |      100 |      100 |                   |
  resolve.js           |      100 |      100 |      100 |      100 |                   |
 core/plugins          |    99.65 |      100 |    98.57 |    99.65 |                   |
  composition.js       |      100 |      100 |      100 |      100 |                   |
  externals.js         |      100 |      100 |      100 |      100 |                   |
  graph-nodes.js       |      100 |      100 |      100 |      100 |                   |
  keyframes.js         |      100 |      100 |      100 |      100 |                   |
  scoping.js           |      100 |      100 |      100 |      100 |                   |
  values-composed.js   |      100 |      100 |      100 |      100 |                   |
  values-export.js     |    88.89 |      100 |       75 |    88.89 |                14 |
  values-imported.js   |      100 |      100 |      100 |      100 |                   |
  values-local.js      |      100 |      100 |      100 |      100 |                   |
  values-namespaced.js |      100 |      100 |      100 |      100 |                   |
  values-replace.js    |      100 |      100 |      100 |      100 |                   |
 glob                  |      100 |       50 |      100 |      100 |                   |
  glob.js              |      100 |       50 |      100 |      100 |                13 |
 namer                 |      100 |    83.33 |      100 |      100 |                   |
  index.js             |      100 |    83.33 |      100 |      100 |                42 |
 paths                 |      100 |      100 |      100 |      100 |                   |
  paths.js             |      100 |      100 |      100 |      100 |                   |
 postcss               |      100 |      100 |      100 |      100 |                   |
  postcss.js           |      100 |      100 |      100 |      100 |                   |
 rollup                |      100 |      100 |      100 |      100 |                   |
  rollup.js            |      100 |      100 |      100 |      100 |                   |
 svelte                |      100 |      100 |      100 |      100 |                   |
  methods.js           |      100 |      100 |      100 |      100 |                   |
  rollup.js            |      100 |      100 |      100 |      100 |                   |
  svelte.js            |      100 |      100 |      100 |      100 |                   |
 test-utils            |      100 |      100 |      100 |      100 |                   |
  namer.js             |      100 |      100 |      100 |      100 |                   |
  prefix.js            |      100 |      100 |      100 |      100 |                   |
  read.js              |      100 |      100 |      100 |      100 |                   |
  relative.js          |      100 |      100 |      100 |      100 |                   |
 webpack               |    95.08 |       75 |    92.86 |       95 |                   |
  loader.js            |    95.45 |    83.33 |      100 |    95.45 |                16 |
  plugin.js            |    94.87 |       70 |    90.91 |    94.74 |             14,25 |
-----------------------|----------|----------|----------|----------|-------------------|
Summary of all failing tests
FAIL packages/cli/test/cli.test.js
  ● /cli.js › should show help with no args

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should default to outputting to stdout

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting to a file (--out)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting compositions to a file (--json)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should return the correct error code on invalid CSS

    expect(received).toMatch(expected)
    
    Expected value to match:
      "Invalid composes reference"
    Received:
      "module.js:478
        throw err;
        ^
    
    Error: Cannot find module 'modular-css-glob'

       6 |     
       7 |     mkdirp = require("mkdirp"),
    >  8 |     glob = require("modular-css-glob"),
       9 |     cli = require("meow")(`
      10 |         Usage
      11 |         $ modular-css [options] <glob>...
      
      at Object.<anonymous> (packages/cli/cli.js:8:12)
      at Function.Module._load (module.js:445:3)"
      at tester.then.out (packages/cli/test/cli.test.js:62:32)

  ● /cli.js › should support disabling url() rewriting (--no-rewrite)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)


Test Suites: 1 failed, 2 skipped, 29 passed, 30 of 32 total
Tests:       6 failed, 5 skipped, 172 passed, 183 total
Snapshots:   192 passed, 192 total
Time:        18.974s
Ran all test suites.
npm ERR! Test failed.  See above for more details.

[TravisBuddy]

Travis tests have failed

Hey @tivac,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: 6

npm test -- --coverage --verbose --ci

> modular-css-root@0.0.0 test /home/travis/build/tivac/modular-css
> jest "--coverage" "--verbose" "--ci"

PASS packages/core/test/options.test.js
  /processor.js
    options
      cwd
        ✓ should use an absolute path (724ms)
        ✓ should accept a relative path but make it absolute (3ms)
      namer
        ✓ should use a custom naming function (10ms)
        ✓ should require a namer if a string is passed (41ms)
        ✓ should use the default naming function if a non-function is passed (2ms)
      map
        ✓ should generate source maps (46ms)
        ○ skipped 1 test
      exportGlobals
        ✓ should not export :global values when exportGlobals is false (6ms)
      rewrite
        ✓ should rewrite url() references by default (7ms)
        ✓ should not rewrite url() references when falsey (3ms)
        ✓ should pass through to postcss-url as config (22ms)
      lifecycle options
        before
          ✓ should run sync postcss plugins before processing (3ms)
          ✓ should run async postcss plugins before processing (5ms)
        processing
          ✓ should run sync postcss plugins processing processing (2ms)
          ✓ should run async postcss plugins processing processing (3ms)
          ✓ should include exports from 'modular-css-export' modules (1ms)
        after
          ✓ should use postcss-url by default (3ms)
          ✓ should run sync postcss plugins (3ms)
          ✓ should run async postcss plugins (3ms)
        done
          ✓ should run sync postcss plugins done processing (4ms)
          ✓ should run async postcss plugins done processing (5ms)
          ✓ should work with cssnano (no preset) (1021ms)
          ��� should work with cssnano (default preset) (15ms)

PASS packages/rollup/test/rollup.test.js
  /rollup.js
    ✓ should be a function (6ms)
    ✓ should generate exports (78ms)
    ✓ should be able to tree-shake results (14ms)
    ✓ should attach a promise to the bundle.generate response (14ms)
    ✓ should generate CSS (21ms)
    ✓ should generate JSON (12ms)
    ✓ should provide named exports (9ms)
    ✓ should generate external source maps (8ms)
    ✓ should warn & not export individual keys when they are not valid identifiers (10ms)
    ✓ should allow disabling of named exports (8ms)
    ✓ shouldn't disable sourcemap generation (12ms)
    ✓ should not output sourcemaps when they are disabled (14ms)
    ✓ should respect the CSS dependency tree (15ms)
    errors
      ✓ should throw errors in in before plugins (5ms)
      ✓ should throw errors in after plugins (5ms)
      ○ skipped 1 test
    watch
      ✓ should generate correct builds in watch mode when files change (407ms)
      ✓ should correctly update files within the dependency graph in watch mode when files change (316ms)
      ✓ should correctly add new css files in watch mode when files change (313ms)

PASS packages/core/test/api.test.js
  /processor.js
    API
      ✓ should be a function (18ms)
      ✓ should auto-instantiate if called without new (3ms)
      .string()
        ✓ should process a string (8ms)
      .file()
        ✓ should process a relative file (6ms)
        ✓ should process an absolute file (4ms)
      .remove()
        ✓ should remove a relative file (2ms)
        ✓ should remove an absolute file (2ms)
        ✓ should remove multiple files (17ms)
        ✓ should remove dependant files (17ms)
        ✓ should return an array of removed files (4ms)
      .dependencies()
        ✓ should return the dependencies of the specified file (14ms)
        ✓ should return the overall order of dependencies if no file is specified (10ms)
      .output()
        ✓ should return a postcss result (15ms)
        ✓ should generate css representing the output from all added files (13ms)
        ✓ should avoid duplicating files in the output (12ms)
        ✓ should generate a JSON structure of all the compositions (13ms)
        ✓ should order output by dependencies, then alphabetically (23ms)
        ✓ should support returning output for specified relative files (21ms)
        ✓ should support returning output for specified absolute files (10ms)
        ✓ should reject if called before input has been processed (6ms)
        ✓ should allow for seperate source map output (23ms)
      ._resolve()
        ✓ should run resolvers until a match is found (2ms)
        ✓ should fall back to a default resolver (2ms)

(node:6051) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
PASS packages/webpack/test/webpack.test.js
  /webpack.js
    ✓ should be a function (4ms)
    ✓ should output css to disk (528ms)
    ✓ should output json to disk (52ms)
    ✓ should output inline source maps (35ms)
    ✓ should output external source maps to disk (44ms)
    ✓ should report errors (92ms)
    ✓ should report warnings on invalid property names (37ms)
    ✓ should handle dependencies (59ms)
    ✓ should support ES2015 default exports (26ms)
    ✓ should support ES2015 named exports (26ms)
    ✓ should support disabling namedExports when the option is set (35ms)
    ✓ should generate correct builds in watch mode when files change (446ms)
    ✓ should generate correct builds when files change (72ms)

PASS packages/browserify/test/factor-bundle.test.js
  /browserify.js
    factor-bundle
      ✓ should be supported (260ms)
      ✓ should support files w/o commonalities (64ms)
      ✓ should properly handle files w/o dependencies (83ms)
      ✓ should support relative paths within factor-bundle files (75ms)
      ✓ should avoid outputting empty css files by default (76ms)
      ✓ should output empty css files when asked (72ms)

PASS packages/browserify/test/browserify.test.js
  /browserify.js
    basic functionality
      ✓ should not error if no options are supplied (22ms)
      ✓ should error if an invalid extension is applied (3ms)
      ✓ should error on invalid CSS (37ms)
      ✓ should replace require() calls with the exported identifiers (43ms)
      ✓ should correctly rewrite urls based on the destination file (40ms)
      ✓ should use the specified namer function (46ms)
      ✓ should include all CSS dependencies in output css (62ms)
      ✓ should write out the complete exported identifiers when `json` is specified (43ms)
      ✓ should not include duplicate files in the output multiple times (53ms)
      ✓ should output an inline source map when the debug option is specified (58ms)
      ✓ should output an external source map when the debug option is specified (50ms)

PASS packages/core/test/composition.test.js
  /processor.js
    composition
      ✓ should fail on invalid composes syntax (17ms)
      ✓ should fail if a composition references a non-existant class (4ms)
      ✓ should fail if a composition references a non-existant file (2ms)
      ✓ should fail if composes isn't the first property (2ms)
      ✓ should fail on rules that use multiple selectors (4ms)
      ✓ should compose a single class (4ms)
      ✓ should allow comments before composes (3ms)
      ✓ should compose from globals (5ms)
      ✓ should compose multiple classes (4ms)
      ✓ should compose from other files (8ms)

PASS packages/browserify/test/watchify.test.js
  /browserify.js
    watchify
      ✓ shouldn't cache file contents between watchify runs (261ms)
      ✓ shouldn't explode on invalid CSS (170ms)

PASS packages/postcss/test/postcss.test.js
  /postcss.js
    ✓ should be a function (2ms)
    ✓ should process CSS and output the result (25ms)
    ✓ should process CSS with dependencies and output the result (19ms)
    ✓ should process CSS and output exports as a message (4ms)
    ✓ should accept normal processor options (8ms)
    ✓ should accept a `json` property and write exports to that file (15ms)
    ✓ should be usable like a normal postcss plugin (6ms)
    ✓ should output json when used within postcss (4ms)
    ✓ should accept json args in either position with postcss (3ms)

PASS packages/core/test/values.test.js
  /processor.js
    values
      ✓ should fail on invalid value syntax (19ms)
      ✓ should fail if a value imports a non-existant reference (3ms)
      ✓ should support simple values (5ms)
      ✓ should support local values in value composition (12ms)
      ✓ should support importing variables from a file (11ms)
      ✓ should support exporting imported variables (11ms)
      ✓ should support value composition (7ms)
      ✓ should support value namespaces (7ms)
      ✓ should support value replacement in :external(...) (25ms)

PASS packages/aliases/test/aliases.test.js
  modular-css-aliases
    ✓ should return a falsey value if a file isn't found (2ms)
    ✓ should return the absolute path if a file is found (1ms)
    ✓ should check multiple aliases for files & return the first match (1ms)
    ✓ should be usable as a modular-css resolver (26ms)
    ✓ should fall through to the default resolver (10ms)

PASS packages/core/test/scoping.test.js
  /processor.js
    scoping
      ✓ should scope classes, ids, and keyframes (20ms)
      ✓ should handle pseudo classes correctly (5ms)
      ✓ should not allow :global classes to overlap with local ones (local before global) (3ms)
      ✓ should not allow :global classes to overlap with local ones (global before local) (2ms)
      ✓ should not allow empty :global() selectors (15ms)

PASS packages/core/test/keyframes.test.js
  /processor.js
    scoping
      ✓ should leave unknown animation names alone (23ms)
      ✓ should update scoped animations from the scoping plugin's message (4ms)
      ✓ should update the animation-name property (4ms)
      ✓ should update multiple animations properly (4ms)
      ✓ should update scoped prefixed animations from the scoping plugin's message (3ms)

PASS packages/browserify/test/issue-313.test.js
  /browserify.js
    /issues
      /313
        ✓ should include all dependencies after watchify update (245ms)

PASS packages/browserify/test/issue-58.test.js
  /browserify.js
    /issues
      /58
        ✓ should update when CSS dependencies change (253ms)

FAIL packages/cli/test/cli.test.js
  /cli.js
    ✕ should show help with no args (106ms)
    ✕ should default to outputting to stdout (93ms)
    ✕ should support outputting to a file (--out) (88ms)
    ✕ should support outputting compositions to a file (--json) (88ms)
    ✕ should return the correct error code on invalid CSS (90ms)
    ✕ should support disabling url() rewriting (--no-rewrite) (96ms)

  ● /cli.js › should show help with no args

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should default to outputting to stdout

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting to a file (--out)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting compositions to a file (--json)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should return the correct error code on invalid CSS

    expect(received).toMatch(expected)
    
    Expected value to match:
      "Invalid composes reference"
    Received:
      "module.js:478
        throw err;
        ^
    
    Error: Cannot find module 'modular-css-glob'

       6 |     
       7 |     mkdirp = require("mkdirp"),
    >  8 |     glob = require("modular-css-glob"),
       9 |     cli = require("meow")(`
      10 |         Usage
      11 |         $ modular-css [options] <glob>...
      
      at Object.<anonymous> (packages/cli/cli.js:8:12)
      at Function.Module._load (module.js:445:3)"
      at tester.then.out (packages/cli/test/cli.test.js:62:32)

  ● /cli.js › should support disabling url() rewriting (--no-rewrite)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

PASS packages/svelte/test/svelte.test.js
  /svelte.js
    ✓ should generate exports (75ms)
    ✓ should ignore files without <style> blocks (5ms)
    ✓ should ignore invalid {css.<key>} (4ms)

PASS packages/paths/test/paths.test.js
  modular-css-paths
    ✓ should return a falsey value if a file isn't found (2ms)
    ✓ should return the absolute path if a file is found (1ms)
    ✓ should check multiple paths for files & return the first match (1ms)
    ✓ should be usable as a modular-css resolver (30ms)

PASS packages/svelte/test/rollup.test.js
  /rollup.js
    ✓ should generate exports (257ms)
    ✓ should not generate exports (119ms)

PASS packages/core/test/externals.test.js
  /processor.js
    externals
      ✓ should fail if not a valid composition reference (19ms)
      ✓ should fail if not referencing another file (2ms)
      ✓ should fail on bad class references (7ms)
      ✓ should support overriding external values (29ms)

PASS packages/namer/test/index.test.js
  modular-css-namer
    ✓ should hash its arguments (2ms)
    ✓ should differ within files (1ms)
    ✓ should re-use selectors for identical inputs
    ✓ should differ between files (2ms)
    ✓ should wrap as necessary (152ms)

PASS packages/glob/test/glob.test.js
  /glob.js
    ✓ should be a function (2ms)
    ✓ should use a default search (50ms)
    ✓ should find files on disk & output css (12ms)
    ✓ should support exclusion patterns (10ms)

PASS packages/core/test/exports.test.js
  /processor.js
    exports
      ✓ should export an object of arrays containing strings (20ms)
      ✓ should export identifiers and their classes (15ms)

PASS packages/core/test/getters.test.js
  /processor.js
    getters
      .file
        ✓ should return all the files that have been added (45ms)
      .options
        ✓ should return the merged options object

PASS packages/core/test/issues/issue-56.test.js
  /issues
    /56
      ✓ should prune rules that only compose, but leave them in the exports (20ms)

PASS packages/core/test/issues/issue-24.test.js
  /issues
    /24
      ✓ should be able to compose using a value (53ms)

PASS packages/core/test/issues/issue-98.test.js
  /issues
    /98
      ✓ should prune rules that only compose, but leave them in the exports (24ms)

PASS packages/core/test/unicode.test.js
  /processor.js
    unicode
      ✓ should support unicode classes & ids (57ms)

PASS packages/core/test/issues/issue-66.test.js
  /issues
    /66
      ✓ should ignore remove calls for unknown files (17ms)

PASS packages/core/test/issues/issue-261.test.js
  /issues
    /261
      ✓ should allow colons in rules that also use :external() (26ms)

-----------------------|----------|----------|----------|----------|-------------------|
File                   |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
-----------------------|----------|----------|----------|----------|-------------------|
All files              |    99.11 |       95 |    98.55 |    99.09 |                   |
 aliases               |      100 |      100 |      100 |      100 |                   |
  aliases.js           |      100 |      100 |      100 |      100 |                   |
 browserify            |    97.78 |    94.44 |    95.83 |    97.78 |                   |
  browserify.js        |    97.78 |    94.44 |    95.83 |    97.78 |            71,173 |
 browserify/test/lib   |      100 |      100 |      100 |      100 |                   |
  bundle.js            |      100 |      100 |      100 |      100 |                   |
 core                  |      100 |      100 |      100 |      100 |                   |
  processor.js         |      100 |      100 |      100 |      100 |                   |
 core/lib              |    98.53 |    91.67 |      100 |    98.48 |                   |
  graph-tiers.js       |    96.43 |    83.33 |      100 |     96.3 |                27 |
  identifiers.js       |      100 |      100 |      100 |      100 |                   |
  message.js           |      100 |      100 |      100 |      100 |                   |
  output.js            |      100 |      100 |      100 |      100 |                   |
  relative.js          |      100 |      100 |      100 |      100 |                   |
  resolve.js           |      100 |      100 |      100 |      100 |                   |
 core/plugins          |    99.65 |      100 |    98.57 |    99.65 |                   |
  composition.js       |      100 |      100 |      100 |      100 |                   |
  externals.js         |      100 |      100 |      100 |      100 |                   |
  graph-nodes.js       |      100 |      100 |      100 |      100 |                   |
  keyframes.js         |      100 |      100 |      100 |      100 |                   |
  scoping.js           |      100 |      100 |      100 |      100 |                   |
  values-composed.js   |      100 |      100 |      100 |      100 |                   |
  values-export.js     |    88.89 |      100 |       75 |    88.89 |                14 |
  values-imported.js   |      100 |      100 |      100 |      100 |                   |
  values-local.js      |      100 |      100 |      100 |      100 |                   |
  values-namespaced.js |      100 |      100 |      100 |      100 |                   |
  values-replace.js    |      100 |      100 |      100 |      100 |                   |
 glob                  |      100 |       50 |      100 |      100 |                   |
  glob.js              |      100 |       50 |      100 |      100 |                13 |
 namer                 |      100 |    83.33 |      100 |      100 |                   |
  index.js             |      100 |    83.33 |      100 |      100 |                42 |
 paths                 |      100 |      100 |      100 |      100 |                   |
  paths.js             |      100 |      100 |      100 |      100 |                   |
 postcss               |      100 |      100 |      100 |      100 |                   |
  postcss.js           |      100 |      100 |      100 |      100 |                   |
 rollup                |      100 |      100 |      100 |      100 |                   |
  rollup.js            |      100 |      100 |      100 |      100 |                   |
 svelte                |      100 |      100 |      100 |      100 |                   |
  methods.js           |      100 |      100 |      100 |      100 |                   |
  rollup.js            |      100 |      100 |      100 |      100 |                   |
  svelte.js            |      100 |      100 |      100 |      100 |                   |
 test-utils            |      100 |      100 |      100 |      100 |                   |
  namer.js             |      100 |      100 |      100 |      100 |                   |
  prefix.js            |      100 |      100 |      100 |      100 |                   |
  read.js              |      100 |      100 |      100 |      100 |                   |
  relative.js          |      100 |      100 |      100 |      100 |                   |
 webpack               |    95.08 |       75 |    92.86 |       95 |                   |
  loader.js            |    95.45 |    83.33 |      100 |    95.45 |                16 |
  plugin.js            |    94.87 |       70 |    90.91 |    94.74 |             14,25 |
-----------------------|----------|----------|----------|----------|-------------------|
Summary of all failing tests
FAIL packages/cli/test/cli.test.js
  ● /cli.js › should show help with no args

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should default to outputting to stdout

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting to a file (--out)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should support outputting compositions to a file (--json)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)

  ● /cli.js › should return the correct error code on invalid CSS

    expect(received).toMatch(expected)
    
    Expected value to match:
      "Invalid composes reference"
    Received:
      "module.js:478
        throw err;
        ^
    
    Error: Cannot find module 'modular-css-glob'

       6 |     
       7 |     mkdirp = require("mkdirp"),
    >  8 |     glob = require("modular-css-glob"),
       9 |     cli = require("meow")(`
      10 |         Usage
      11 |         $ modular-css [options] <glob>...
      
      at Object.<anonymous> (packages/cli/cli.js:8:12)
      at Function.Module._load (module.js:445:3)"
      at tester.then.out (packages/cli/test/cli.test.js:62:32)

  ● /cli.js › should support disabling url() rewriting (--no-rewrite)

    expect(received).toBe(expected) // Object.is equality
    
    Expected value to be:
      0
    Received:
      1

       8 | 
       9 | function success(out) {
    > 10 |     expect(out.code).toBe(0);
      11 |     
      12 |     return out;
      13 | }
      
      at success (packages/cli/test/cli.test.js:10:22)


Test Suites: 1 failed, 2 skipped, 29 passed, 30 of 32 total
Tests:       6 failed, 5 skipped, 172 passed, 183 total
Snapshots:   192 passed, 192 total
Time:        19.278s
Ran all test suites.
npm ERR! Test failed.  See above for more details.

[TravisBuddy]

Hey @tivac,
Something went wrong with the build.

TravisCI finished with status errored, which means the build failed because something unrelated to the tests, like a problem a dependency or the build process itself.