fix(vitest): clarify slowTestThreshold, print slow tests in non-TTY mode (#6715)

Author: sheremet-va

Diff for: docs/advanced/reporters.md

@@ -196,6 +196,10 @@ export interface TestResultSkipped {
 }
 
 export interface TestDiagnostic {
+  /**
+   * If the duration of the test is above `slowTestThreshold`.
+   */
+  slow: boolean
   /**
    * The amount of memory used by the test in bytes.
    * This value is only available if the test was executed with `logHeapUsage` flag.

Diff for: docs/config/index.md

@@ -2174,7 +2174,7 @@ Path to custom tsconfig, relative to the project root.
 - **Default**: `300`
 - **CLI**: `--slow-test-threshold=<number>`, `--slowTestThreshold=<number>`
 
-The number of milliseconds after which a test is considered slow and reported as such in the results.
+The number of milliseconds after which a test or suite is considered slow and reported as such in the results.
 
 ### chaiConfig {#chaiconfig}
 

Diff for: packages/vitest/src/node/cli/cli-config.ts

@@ -656,7 +656,7 @@ export const cliOptionsConfig: VitestCLIOptions = {
   },
   slowTestThreshold: {
     description:
-      'Threshold in milliseconds for a test to be considered slow (default: `300`)',
+      'Threshold in milliseconds for a test or suite to be considered slow (default: `300`)',
     argument: '<threshold>',
   },
   teardownTimeout: {

Diff for: packages/vitest/src/node/reporters/base.ts

@@ -10,7 +10,7 @@ import type { Vitest } from '../core'
 import type { Reporter } from '../types/reporter'
 import type { ErrorWithDiff, UserConsoleLog } from '../../types/general'
 import { hasFailedSnapshot } from '../../utils/tasks'
-import { F_POINTER, F_RIGHT } from './renderers/figures'
+import { F_CHECK, F_POINTER, F_RIGHT } from './renderers/figures'
 import {
   countTestErrors,
   divider,
@@ -131,13 +131,7 @@ export abstract class BaseReporter implements Reporter {
       state += ` ${c.dim('|')} ${c.yellow(`${skipped.length} skipped`)}`
     }
     let suffix = c.dim(' (') + state + c.dim(')')
-    if (task.result.duration) {
-      const color
-        = task.result.duration > this.ctx.config.slowTestThreshold
-          ? c.yellow
-          : c.gray
-      suffix += color(` ${Math.round(task.result.duration)}${c.dim('ms')}`)
-    }
+    suffix += this.getDurationPrefix(task)
     if (this.ctx.config.logHeapUsage && task.result.heap != null) {
       suffix += c.magenta(
         ` ${Math.floor(task.result.heap / 1024 / 1024)} MB heap used`,
@@ -154,13 +148,36 @@ export abstract class BaseReporter implements Reporter {
     title += `${task.name} ${suffix}`
     logger.log(title)
 
-    // print short errors, full errors will be at the end in summary
-    for (const test of failed) {
-      logger.log(c.red(`   ${taskFail} ${getTestName(test, c.dim(' > '))}`))
-      test.result?.errors?.forEach((e) => {
-        logger.log(c.red(`     ${F_RIGHT} ${(e as any)?.message}`))
-      })
+    for (const test of tests) {
+      const duration = test.result?.duration
+      if (test.result?.state === 'fail') {
+        const suffix = this.getDurationPrefix(test)
+        logger.log(c.red(`   ${taskFail} ${getTestName(test, c.dim(' > '))}${suffix}`))
+
+        test.result?.errors?.forEach((e) => {
+          // print short errors, full errors will be at the end in summary
+          logger.log(c.red(`     ${F_RIGHT} ${(e as any)?.message}`))
+        })
+      }
+      // also print slow tests
+      else if (duration && duration > this.ctx.config.slowTestThreshold) {
+        logger.log(
+          `   ${c.yellow(c.dim(F_CHECK))} ${getTestName(test, c.dim(' > '))}${c.yellow(
+            ` ${Math.round(duration)}${c.dim('ms')}`,
+          )}`,
+        )
+      }
+    }
+  }
+
+  private getDurationPrefix(task: Task) {
+    if (!task.result?.duration) {
+      return ''
     }
+    const color = task.result.duration > this.ctx.config.slowTestThreshold
+      ? c.yellow
+      : c.gray
+    return color(` ${Math.round(task.result.duration)}${c.dim('ms')}`)
   }
 
   onWatcherStart(

Diff for: packages/vitest/src/node/reporters/reported-tasks.ts

@@ -155,9 +155,12 @@ export class TestCase extends ReportedTaskImplementation {
     if (!result || result.state === 'run' || !result.startTime) {
       return undefined
     }
+    const duration = result.duration || 0
+    const slow = duration > this.project.globalConfig.slowTestThreshold
     return {
+      slow,
       heap: result.heap,
-      duration: result.duration!,
+      duration,
       startTime: result.startTime,
       retryCount: result.retryCount ?? 0,
       repeatCount: result.repeatCount ?? 0,
@@ -441,6 +444,10 @@ export interface TestResultSkipped {
 }
 
 export interface TestDiagnostic {
+  /**
+   * If the duration of the test is above `slowTestThreshold`.
+   */
+  slow: boolean
   /**
    * The amount of memory used by the test in bytes.
    * This value is only available if the test was executed with `logHeapUsage` flag.

Diff for: test/reporters/tests/merge-reports.test.ts

@@ -89,13 +89,13 @@ test('merge reports', async () => {
     test 1-2
 
      ❯ first.test.ts  (2 tests | 1 failed) <time>
-       × test 1-2
+       × test 1-2 <time>
          → expected 1 to be 2 // Object.is equality
     stdout | second.test.ts > test 2-1
     test 2-1
 
      ❯ second.test.ts  (3 tests | 1 failed) <time>
-       × test 2-1
+       × test 2-1 <time>
          → expected 1 to be 2 // Object.is equality
 
      Test Files  2 failed (2)