feat(experimental): add TestAttachment.bodyEncoding

docs/api/advanced/artifacts.md

@@ -82,13 +82,22 @@ export interface TestAttachment {
   path?: string
   /** Inline attachment content as a string or raw binary data */
   body?: string | Uint8Array
+  /**
+   * @experimental
+   * How the string `body` is encoded.
+   * - `'base64'` (default): body is already base64-encoded
+   * - `'utf-8'`: body is a utf8 string
+   */
+  bodyEncoding?: 'base64' | 'utf-8'
 }
 ```
 
 The `TestAttachment` interface represents a file or data attachment associated with a test artifact.
 
 Attachments can be either file-based (via `path`) or inline content (via `body`). The `contentType` helps consumers understand how to interpret the attachment data.
 
+If you pass a string `body`, Vitest assumes it is already base64-encoded unless you set `bodyEncoding: 'utf-8'`. When you pass `body` as a `Uint8Array`, Vitest automatically encodes it as base64. The `bodyEncoding` option only applies to inline `body` attachments, not `path` attachments.
+
 ### `TestArtifactLocation`
 
 ```ts

docs/guide/test-annotations.md

@@ -17,6 +17,12 @@ test('hello world', async ({ annotate }) => {
 
   const file = createTestSpecificFile()
   await annotate('creates a file', { body: file })
+
+  await annotate('creates a file with text', {
+    contentType: 'text/markdown',
+    body: 'Hello **markdown**',
+    bodyEncoding: 'utf-8',
+  })
 })
 ```
 

packages/runner/src/artifact.ts

@@ -174,8 +174,14 @@ export function manageArtifactAttachment(attachment: TestAttachment): void {
   if (attachment.body && attachment.path) {
     throw new TypeError(`Test attachment requires only one of "body" or "path" to be set. Both are specified.`)
   }
+  if (attachment.path && attachment.bodyEncoding) {
+    throw new TypeError(`Test attachment with "path" should not have "bodyEncoding" specified.`)
+  }
   // convert to a string so it's easier to serialise
   if (attachment.body instanceof Uint8Array) {
     attachment.body = encodeUint8Array(attachment.body)
   }
+  if (attachment.body != null) {
+    attachment.bodyEncoding ??= 'base64'
+  }
 }

packages/runner/src/types/tasks.ts

@@ -1263,6 +1263,17 @@ export interface TestAttachment {
   path?: string
   /** Inline attachment content as a string or raw binary data */
   body?: string | Uint8Array | undefined
+  // TODO: change default to utf-8 on next major
+  /**
+   * @experimental
+   * How the string `body` is encoded.
+   * - `'base64'` (default): body is already base64-encoded
+   * - `'utf-8'`: body is a utf8 string
+   *
+   * `body: Uint8Array` is always auto-encoded to string with `bodyEncoding: 'base64'`
+   * regardless of this option.
+   */
+  bodyEncoding?: 'base64' | 'utf-8'
 }
 
 export interface Location {

packages/ui/client/composables/attachments.ts

@@ -13,6 +13,9 @@ export function getAttachmentUrl(attachment: TestAttachment): string {
     return `/__vitest_attachment__?path=${encodeURIComponent(attachment.path)}&contentType=${contentType}&token=${(window as any).VITEST_API_TOKEN}`
   }
   // attachment.body is always a string outside of the test frame
+  if (attachment.bodyEncoding === 'utf-8') {
+    return `data:${contentType},${encodeURIComponent(attachment.body as string)}`
+  }
   return `data:${contentType};base64,${attachment.body}`
 }
 

test/cli/test/annotations.test.ts

@@ -23,6 +23,8 @@ test('simple', async ({ annotate }) => {
   await annotate('with base64 body', { body: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/' })
   await annotate('with Uint8Array body', { body: new Uint8Array(Array.from({ length: 256 }).map((_, i) => i)) })
   await annotate('with contentType', { body: '', contentType: 'text/plain' })
+  await annotate('bodyEncoding utf-8', { body: 'Hello world', bodyEncoding: 'utf-8', contentType: 'text/plain' })
+  await annotate('bodyEncoding base64', { body: btoa('Hello world'), bodyEncoding: 'base64', contentType: 'text/plain' })
 })
 
 describe('suite', () => {
@@ -112,6 +114,8 @@ describe('API', () => {
         "[annotate] simple with base64 body notice path=undefined contentType=undefined body=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
         "[annotate] simple with Uint8Array body notice path=undefined contentType=undefined body=AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==",
         "[annotate] simple with contentType notice path=undefined contentType=text/plain body=",
+        "[annotate] simple bodyEncoding utf-8 notice path=undefined contentType=text/plain body=Hello world",
+        "[annotate] simple bodyEncoding base64 notice path=undefined contentType=text/plain body=SGVsbG8gd29ybGQ=",
         "[result] simple",
         "[ready] second",
         "[annotate] second 5 notice path=undefined contentType=undefined body=undefined",
@@ -133,7 +137,7 @@ describe('API', () => {
             "location": {
               "column": 11,
               "file": "<root>/basic.test.ts",
-              "line": 18,
+              "line": 20,
             },
             "message": "5",
             "type": "notice",
@@ -145,7 +149,7 @@ describe('API', () => {
             "location": {
               "column": 11,
               "file": "<root>/basic.test.ts",
-              "line": 19,
+              "line": 21,
             },
             "message": "6",
             "type": "notice",
@@ -208,6 +212,7 @@ describe('API', () => {
           {
             "attachment": {
               "body": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
+              "bodyEncoding": "base64",
             },
             "location": {
               "column": 9,
@@ -220,6 +225,7 @@ describe('API', () => {
           {
             "attachment": {
               "body": "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==",
+              "bodyEncoding": "base64",
             },
             "location": {
               "column": 9,
@@ -232,6 +238,7 @@ describe('API', () => {
           {
             "attachment": {
               "body": "",
+              "bodyEncoding": "base64",
               "contentType": "text/plain",
             },
             "location": {
@@ -242,6 +249,34 @@ describe('API', () => {
             "message": "with contentType",
             "type": "notice",
           },
+          {
+            "attachment": {
+              "body": "Hello world",
+              "bodyEncoding": "utf-8",
+              "contentType": "text/plain",
+            },
+            "location": {
+              "column": 9,
+              "file": "<root>/basic.test.ts",
+              "line": 14,
+            },
+            "message": "bodyEncoding utf-8",
+            "type": "notice",
+          },
+          {
+            "attachment": {
+              "body": "SGVsbG8gd29ybGQ=",
+              "bodyEncoding": "base64",
+              "contentType": "text/plain",
+            },
+            "location": {
+              "column": 9,
+              "file": "<root>/basic.test.ts",
+              "line": 15,
+            },
+            "message": "bodyEncoding base64",
+            "type": "notice",
+          },
         ],
       }
     `)
@@ -290,6 +325,8 @@ describe('reporters', () => {
               # notice: with base64 body
               # notice: with Uint8Array body
               # notice: with contentType
+              # notice: bodyEncoding utf-8
+              # notice: bodyEncoding base64
           ok 2 - suite # time=<time> {
               1..1
               ok 1 - second # time=<time>
@@ -323,6 +360,8 @@ describe('reporters', () => {
           # notice: with base64 body
           # notice: with Uint8Array body
           # notice: with contentType
+          # notice: bodyEncoding utf-8
+          # notice: bodyEncoding base64
       ok 2 - basic.test.ts > suite > second # time=<time>
           # notice: 5
           # notice: 6
@@ -367,6 +406,10 @@ describe('reporters', () => {
                       </property>
                       <property name="notice" value="with contentType">
                       </property>
+                      <property name="notice" value="bodyEncoding utf-8">
+                      </property>
+                      <property name="notice" value="bodyEncoding base64">
+                      </property>
                   </properties>
               </testcase>
               <testcase classname="basic.test.ts" name="suite &gt; second" time="0">
@@ -417,9 +460,13 @@ describe('reporters', () => {
 
       ::notice file=<root>/basic.test.ts,line=13,column=9::with contentType
 
-      ::notice file=<root>/basic.test.ts,line=18,column=11::5
+      ::notice file=<root>/basic.test.ts,line=14,column=9::bodyEncoding utf-8
+
+      ::notice file=<root>/basic.test.ts,line=15,column=9::bodyEncoding base64
+
+      ::notice file=<root>/basic.test.ts,line=20,column=11::5
 
-      ::notice file=<root>/basic.test.ts,line=19,column=11::6
+      ::notice file=<root>/basic.test.ts,line=21,column=11::6
       "
     `)
   })
@@ -460,12 +507,16 @@ describe('reporters', () => {
            ↳ with Uint8Array body
          ❯ basic.test.ts:13:9 notice
            ↳ with contentType
+         ❯ basic.test.ts:14:9 notice
+           ↳ bodyEncoding utf-8
+         ❯ basic.test.ts:15:9 notice
+           ↳ bodyEncoding base64
 
        ✓ basic.test.ts > suite > second <time>
 
-         ❯ basic.test.ts:18:11 notice
+         ❯ basic.test.ts:20:11 notice
            ↳ 5
-         ❯ basic.test.ts:19:11 notice
+         ❯ basic.test.ts:21:11 notice
            ↳ 6
 
       "

test/cli/test/artifacts.test.ts

@@ -196,6 +196,7 @@ describe('API', () => {
             "attachments": [
               {
                 "body": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
+                "bodyEncoding": "base64",
               },
             ],
             "location": {
@@ -209,6 +210,7 @@ describe('API', () => {
             "attachments": [
               {
                 "body": "AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==",
+                "bodyEncoding": "base64",
               },
             ],
             "location": {
@@ -222,6 +224,7 @@ describe('API', () => {
             "attachments": [
               {
                 "body": "",
+                "bodyEncoding": "base64",
                 "contentType": "text/plain",
               },
             ],

test/ui/fixtures/annotated.test.ts

@@ -21,11 +21,17 @@ test('annotated image test', async ({ annotate }) => {
   })
 })
 
-test('annotated with body', async ({ annotate }) => {
-  await annotate('body annotation', {
+test('annotated with body base64', async ({ annotate }) => {
+  await annotate('body base64 annotation', {
     contentType: 'text/markdown',
-    // requires pre-encoded base64 for raw string
-    // https://github.com/vitest-dev/vitest/issues/9633
-    body: btoa('Hello **markdown**'),
+    body: btoa('Hello base64 **markdown**'),
+  })
+})
+
+test('annotated with body utf-8', async ({ annotate }) => {
+  await annotate('body utf-8 annotation', {
+    contentType: 'text/markdown',
+    body: 'Hello utf-8 **markdown**',
+    bodyEncoding: 'utf-8',
   })
 })

test/ui/test/html-report.spec.ts

@@ -52,9 +52,9 @@ test.describe('html report', () => {
     await page.goto(pageUrl)
 
     // dashboard
-    await expect(page.getByTestId('pass-entry')).toContainText('16 Pass')
+    await expect(page.getByTestId('pass-entry')).toContainText('17 Pass')
     await expect(page.getByTestId('fail-entry')).toContainText('2 Fail')
-    await expect(page.getByTestId('total-entry')).toContainText('18 Total')
+    await expect(page.getByTestId('total-entry')).toContainText('19 Total')
 
     // unhandled errors
     await expect(page.getByTestId('unhandled-errors')).toContainText(
@@ -160,25 +160,46 @@ test.describe('html report', () => {
       await expect(img).not.toHaveJSProperty('naturalWidth', 0)
     })
 
-    await test.step('annotated with body', async () => {
-      const item = page.getByLabel('annotated with body')
+    await test.step('annotated with body base64', async () => {
+      const item = page.getByLabel('annotated with body base64')
       await item.click({ force: true })
       await page.getByTestId('btn-report').click({ force: true })
 
       const annotation = page.getByRole('note')
       await expect(annotation).toHaveCount(1)
 
-      await expect(annotation).toContainText('body annotation')
+      await expect(annotation).toContainText('body base64 annotation')
       await expect(annotation).toContainText('notice')
       await expect(annotation).toContainText('fixtures/annotated.test.ts:25:9')
 
       const downloadPromise = page.waitForEvent('download')
       await annotation.getByRole('link').click()
       const download = await downloadPromise
-      expect(download.suggestedFilename()).toBe('body-annotation.md')
+      expect(download.suggestedFilename()).toBe('body-base64-annotation.md')
       const downloadPath = await download.path()
       const content = readFileSync(downloadPath, 'utf-8')
-      expect(content).toBe('Hello **markdown**')
+      expect(content).toBe('Hello base64 **markdown**')
+    })
+
+    await test.step('annotated with body utf-8', async () => {
+      const item = page.getByLabel('annotated with body utf-8')
+      await item.click({ force: true })
+      await page.getByTestId('btn-report').click({ force: true })
+
+      const annotation = page.getByRole('note')
+      await expect(annotation).toHaveCount(1)
+
+      await expect(annotation).toContainText('body utf-8 annotation')
+      await expect(annotation).toContainText('notice')
+      await expect(annotation).toContainText('fixtures/annotated.test.ts:32:9')
+
+      const downloadPromise = page.waitForEvent('download')
+      await annotation.getByRole('link').click()
+      const download = await downloadPromise
+      expect(download.suggestedFilename()).toBe('body-utf-8-annotation.md')
+      const downloadPath = await download.path()
+      const content = readFileSync(downloadPath, 'utf-8')
+      expect(content).toBe('Hello utf-8 **markdown**')
     })
   })
 
@@ -190,18 +211,20 @@ test.describe('html report', () => {
     await page.getByTestId('btn-code').click({ force: true })
 
     const annotations = page.getByRole('note')
-    await expect(annotations).toHaveCount(6)
+    await expect(annotations).toHaveCount(7)
 
     await expect(annotations.first()).toHaveText('notice: hello world')
     await expect(annotations.nth(1)).toHaveText('notice: second annotation')
     await expect(annotations.nth(2)).toHaveText('warning: beware!')
     await expect(annotations.nth(3)).toHaveText(/notice: file annotation/)
     await expect(annotations.nth(4)).toHaveText('notice: image annotation')
-    await expect(annotations.nth(5)).toHaveText(/notice: body annotation/)
+    await expect(annotations.nth(5)).toHaveText(/notice: body base64 annotation/)
+    await expect(annotations.nth(6)).toHaveText(/notice: body utf-8 annotation/)
 
     await expect(annotations.nth(3).getByRole('link')).toHaveAttribute('href', /data\/\w+/)
     await expect(annotations.nth(4).getByRole('link')).toHaveAttribute('href', /data\/\w+/)
     await expect(annotations.nth(5).getByRole('link')).toHaveAttribute('href', /^data:text\/markdown;base64,/)
+    await expect(annotations.nth(6).getByRole('link')).toHaveAttribute('href', /^data:text\/markdown,/)
   })
 
   test('tags filter', async ({ page }) => {