(refactor): split build tests into separate files per fixture

- better organized that way as the tests are somewhat independent of
  one another and previously even I was confused where to put different
  types of tests

- also refactor some test naming and some redundant usage of flags
  - especially for 0-config, where flags shouldn't be used

- and remove testEnvironment comment as it's already set in jest config

(optim): now that it's one fixture per file, we only need to copy the
fixture directory once per file, which should be a speed boost
- and sometimes may not need to re-run `tsdx build` when not necessary
- also the different test files get parallelized, which is also faster

- before: 53s avg on my machine, after: 37s avg on my machine
  - avg for running all tests
  - pretty BIG difference

test/tests/tsdx-build-default.test.js

@@ -0,0 +1,75 @@
+const shell = require('shelljs');
+const util = require('../fixtures/util');
+
+shell.config.silent = false;
+
+const fixtureName = 'build-default';
+const stageName = `stage-${fixtureName}`;
+
+describe('tsdx build :: zero-config defaults', () => {
+  beforeAll(() => {
+    util.teardownStage(stageName);
+    util.setupStageWithFixture(stageName, fixtureName);
+  });
+
+  it('should compile files into a dist directory', () => {
+    const output = shell.exec('node ../dist/index.js build');
+
+    expect(shell.test('-f', 'dist/index.js')).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-default.cjs.development.js')
+    ).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-default.cjs.production.min.js')
+    ).toBeTruthy();
+    expect(shell.test('-f', 'dist/build-default.esm.js')).toBeTruthy();
+
+    expect(shell.test('-f', 'dist/index.d.ts')).toBeTruthy();
+
+    expect(output.code).toBe(0);
+  });
+
+  it('should create the library correctly', () => {
+    const lib = require(`../../${stageName}/dist`);
+    expect(lib.foo()).toBe('bar');
+    expect(lib.__esModule).toBe(true);
+  });
+
+  it('should clean the dist directory before rebuilding', () => {
+    shell.mv('package.json', 'package-og.json');
+    shell.mv('package2.json', 'package.json');
+
+    const output = shell.exec('node ../dist/index.js build');
+    expect(shell.test('-f', 'dist/index.js')).toBeTruthy();
+
+    // build-default files have been cleaned out
+    expect(
+      shell.test('-f', 'dist/build-default.cjs.development.js')
+    ).toBeFalsy();
+    expect(
+      shell.test('-f', 'dist/build-default.cjs.production.min.js')
+    ).toBeFalsy();
+    expect(shell.test('-f', 'dist/build-default.esm.js')).toBeFalsy();
+
+    // build-default-2 files have been added
+    expect(
+      shell.test('-f', 'dist/build-default-2.cjs.development.js')
+    ).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-default-2.cjs.production.min.js')
+    ).toBeTruthy();
+    expect(shell.test('-f', 'dist/build-default-2.esm.js')).toBeTruthy();
+
+    expect(shell.test('-f', 'dist/index.d.ts')).toBeTruthy();
+
+    expect(output.code).toBe(0);
+
+    // reset package.json files
+    shell.mv('package.json', 'package2.json');
+    shell.mv('package-og.json', 'package.json');
+  });
+
+  afterAll(() => {
+    util.teardownStage(stageName);
+  });
+});

test/tests/tsdx-build-invalid.test.js

@@ -0,0 +1,40 @@
+const shell = require('shelljs');
+const util = require('../fixtures/util');
+
+shell.config.silent = false;
+
+const fixtureName = 'build-invalid';
+const stageName = `stage-${fixtureName}`;
+
+describe('tsdx build :: invalid build', () => {
+  beforeAll(() => {
+    util.teardownStage(stageName);
+    util.setupStageWithFixture(stageName, fixtureName);
+  });
+
+  it('should fail gracefully with exit code 1 when build failed', () => {
+    const code = shell.exec('node ../dist/index.js build').code;
+    expect(code).toBe(1);
+  });
+
+  it('should only transpile and not type check', () => {
+    const code = shell.exec('node ../dist/index.js build --transpileOnly').code;
+
+    expect(shell.test('-f', 'dist/index.js')).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-invalid.cjs.development.js')
+    ).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-invalid.cjs.production.min.js')
+    ).toBeTruthy();
+    expect(shell.test('-f', 'dist/build-invalid.esm.js')).toBeTruthy();
+
+    expect(shell.test('-f', 'dist/index.d.ts')).toBeTruthy();
+
+    expect(code).toBe(0);
+  });
+
+  afterAll(() => {
+    util.teardownStage(stageName);
+  });
+});

test/tests/tsdx-build-withTsconfig.test.js

@@ -0,0 +1,63 @@
+const shell = require('shelljs');
+const util = require('../fixtures/util');
+
+shell.config.silent = false;
+
+const fixtureName = 'build-withTsconfig';
+const stageName = `stage-${fixtureName}`;
+
+describe('tsdx build :: build with custom tsconfig.json options', () => {
+  beforeAll(() => {
+    util.teardownStage(stageName);
+    util.setupStageWithFixture(stageName, fixtureName);
+  });
+
+  it('should use the declarationDir when set', () => {
+    const output = shell.exec('node ../dist/index.js build');
+
+    expect(shell.test('-f', 'dist/index.js')).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-withtsconfig.cjs.development.js')
+    ).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-withtsconfig.cjs.production.min.js')
+    ).toBeTruthy();
+    expect(shell.test('-f', 'dist/build-withtsconfig.esm.js')).toBeTruthy();
+
+    expect(shell.test('-f', 'dist/index.d.ts')).toBeFalsy();
+    expect(shell.test('-f', 'typings/index.d.ts')).toBeTruthy();
+    expect(shell.test('-f', 'typings/index.d.ts.map')).toBeTruthy();
+
+    expect(output.code).toBe(0);
+  });
+
+  it('should set __esModule according to esModuleInterop', () => {
+    const lib = require(`../../${stageName}/dist/build-withtsconfig.cjs.production.min.js`);
+    // if esModuleInterop: false, no __esModule is added, therefore undefined
+    expect(lib.__esModule).toBe(undefined);
+  });
+
+  it('should read custom --tsconfig path', () => {
+    const output = shell.exec(
+      'node ../dist/index.js build --format cjs --tsconfig ./src/tsconfig.json'
+    );
+
+    expect(shell.test('-f', 'dist/index.js')).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-withtsconfig.cjs.development.js')
+    ).toBeTruthy();
+    expect(
+      shell.test('-f', 'dist/build-withtsconfig.cjs.production.min.js')
+    ).toBeTruthy();
+
+    expect(shell.test('-f', 'dist/index.d.ts')).toBeFalsy();
+    expect(shell.test('-f', 'typingsCustom/index.d.ts')).toBeTruthy();
+    expect(shell.test('-f', 'typingsCustom/index.d.ts.map')).toBeTruthy();
+
+    expect(output.code).toBe(0);
+  });
+
+  afterAll(() => {
+    util.teardownStage(stageName);
+  });
+});