support this.data

index.js

@@ -1,6 +1,17 @@
 import Test from './lib/test.js'
 import ansi from 'ansi-escape-sequences'
 import { pathToFileURL } from 'node:url'
+import os from 'node:os'
+import util from 'node:util'
+
+/* TODO: Factor out node-specific code */
+
+function indent (input, indentWith) {
+  const lines = input.split(os.EOL).map(line => {
+    return indentWith + line
+  })
+  return lines.join(os.EOL)
+}
 
 class TestRunner {
   tests
@@ -30,7 +41,7 @@ class TestRunner {
     function createTests (arr, map, file) {
       for (const [name, testFn] of map) {
         const test = new Test(name, testFn)
-        test.data.file = file
+        test.metadata.file = file
         tests.push(test)
       }
     }
@@ -55,7 +66,10 @@ class TestRunner {
 
     this.tests = tests
     for await (const test of this.run()) {
-      console.log(`${ansi.format('✔', ['green'])} ${ansi.format(test.data.file, ['magenta'])} ${test.name}`)
+      console.log(`${ansi.format('✔', ['green'])} ${ansi.format(test.metadata.file, ['magenta'])} ${test.name}`)
+      if (test.data) {
+        console.log(indent(os.EOL + util.inspect(test.data, { colors: true }) + os.EOL, '  '))
+      }
     }
   }
 }

lib/test.js

@@ -2,7 +2,8 @@ class Test {
   name
   testFn
   result
-  data = {} // optional associated metadata, consumed by runner user (e.g. to store the test file name) not the runner itself
+  metadata = {} // optional associated metadata, consumed by runner user (e.g. to store the test file name) not the runner itself
+  data // user context data displayed in the output alongside the text result
 
   constructor (name, testFn, options = {}) {
     this.name = name

test/fixture/two.js

@@ -0,0 +1,7 @@
+const test = new Map()
+
+test.set('two', function two () {
+  throw new Error('broken')
+})
+
+export { test }

test/test.js

@@ -4,7 +4,7 @@ import { strict as a } from 'assert'
 
 /* Node.js version 12 compatible - no module-level await. */
 
-/* Sync tess passes, storing the result */
+/* Sync test passes, storing the result */
 async function one () {
   const actuals = []
   const test1 = new Test('one', function one () {
@@ -18,9 +18,37 @@ async function one () {
 }
 one()
 
-/* Cli loads and runs a test file */
-async function cli () {
+/* Sync test fails, crashing the process */
+async function syncFail () {
+  const actuals = []
+  const test1 = new Test('one', function one () {
+    actuals.push('one')
+    throw new Error('broken')
+  })
+  const runner = new TestRunner([test1])
+  try {
+    await runner.runAll()
+    throw new Error('Should not reach here')
+  } catch (err) {
+    a.equal(err.message, 'broken')
+    a.equal(test1.result, undefined)
+    a.deepEqual(actuals, ['one'])
+  }
+}
+syncFail()
+
+{ /* Cli loads and runs a test file, test passes */
+  const runner = new TestRunner()
+  runner.start(['./test/fixture/one.js'])
+}
+
+{ /* Cli loads and runs a test file, test fails */
   const runner = new TestRunner()
-  await runner.start(['./test/fixture/one.js'])
+  runner.start(['./test/fixture/two.js'])
+    .then(() => {
+      throw new Error('Should not reach here')
+    })
+    .catch(err => {
+      a.equal(err.message, 'broken')
+    })
 }
-cli()