Fix: Combine tags correctly when transforming story files

.storybook/preview.ts

@@ -1,3 +1,4 @@
+import type { Preview } from '@storybook/react';
 import { isTestRunner } from './is-test-runner';
 
 const withSkippableTests = (StoryFn, { parameters }) => {
@@ -8,4 +9,9 @@ const withSkippableTests = (StoryFn, { parameters }) => {
   return StoryFn();
 };
 
-export const decorators = [withSkippableTests];
+const preview: Preview = {
+  tags: ['global-tag'],
+  decorators: [withSkippableTests],
+};
+
+export default preview;

README.md

@@ -220,7 +220,7 @@ module.exports = {
 
 ## Filtering tests (experimental)
 
-You might want to skip certain stories in the test-runner, run tests only against a subset of stories, or exclude certain stories entirely from your tests. This is possible via the `tags` annotation.
+You might want to skip certain stories in the test-runner, run tests only against a subset of stories, or exclude certain stories entirely from your tests. This is possible via the `tags` annotation. By default, the test-runner includes every story with the `"test"` tag. This tag is included by default in Storybook 8 for all stories, unless the user tells otherwise via [tag negation](https://storybook.js.org/docs/writing-stories/tags#removing-tags).
 
 This annotation can be part of a story, therefore only applying to it, or the component meta (the default export), which applies to all stories in the file:
 

src/csf/transformCsf.ts

@@ -2,7 +2,7 @@
 import { loadCsf } from '@storybook/csf-tools';
 import * as t from '@babel/types';
 import generate from '@babel/generator';
-import { toId, storyNameFromExport } from '@storybook/csf';
+import { toId, storyNameFromExport, combineTags } from '@storybook/csf';
 import dedent from 'ts-dedent';
 
 import { getTagOptions } from '../util/getTagOptions';
@@ -108,7 +108,8 @@ export const transformCsf = (
     beforeEachPrefixer,
     insertTestIfEmpty,
     makeTitle,
-  }: TransformOptions
+    previewAnnotations = { tags: [] },
+  }: TransformOptions & { previewAnnotations?: Record<string, any> }
 ) => {
   const { includeTags, excludeTags, skipTags } = getTagOptions();
 
@@ -126,7 +127,14 @@ export const transformCsf = (
         acc[key].play = annotations.play;
       }
 
-      acc[key].tags = csf._stories[key].tags || csf.meta?.tags || [];
+      acc[key].tags = combineTags(
+        'test',
+        'dev',
+        ...(csf.meta?.tags || []),
+        ...(csf._stories[key].tags || []),
+        ...previewAnnotations.tags
+      );
+
       return acc;
     },
     {}

src/playwright/transformPlaywright.test.ts

@@ -42,6 +42,7 @@ describe('Playwright', () => {
     delete process.env.STORYBOOK_INCLUDE_TAGS;
     delete process.env.STORYBOOK_EXCLUDE_TAGS;
     delete process.env.STORYBOOK_SKIP_TAGS;
+    delete process.env.STORYBOOK_PREVIEW_TAGS;
   });
 
   describe('tag filtering mechanism', () => {
@@ -324,22 +325,26 @@ describe('Playwright', () => {
       `);
     });
     it('should work in conjunction with includeTags, excludeTags and skipTags', () => {
-      process.env.STORYBOOK_INCLUDE_TAGS = 'play,design';
+      process.env.STORYBOOK_INCLUDE_TAGS = 'play,design,global-tag';
       process.env.STORYBOOK_SKIP_TAGS = 'skip';
       process.env.STORYBOOK_EXCLUDE_TAGS = 'exclude';
+      process.env.STORYBOOK_PREVIEW_TAGS = 'global-tag';
+
       // Should result in:
       // - A being excluded
       // - B being included, but skipped
       // - C being included
-      // - D being excluded
+      // - D being included
+      // - E being excluded
       expect(
         transformPlaywright(
           dedent`
         export default { title: 'foo/bar', component: Button };
         export const A = { tags: ['play', 'exclude'] };
         export const B = { tags: ['play', 'skip'] };
         export const C = { tags: ['design'] };
-        export const D = { };
+        export const D = { tags: ['global-tag'] };
+        export const E = { };
       `,
           filename
         )
@@ -436,6 +441,227 @@ describe('Playwright', () => {
                 }
               });
             });
+            describe("D", () => {
+              it("smoke-test", async () => {
+                const testFn = async () => {
+                  const context = {
+                    id: "example-foo-bar--d",
+                    title: "Example/foo/bar",
+                    name: "D"
+                  };
+                  if (globalThis.__sbPreVisit) {
+                    await globalThis.__sbPreVisit(page, context);
+                  }
+                  const result = await page.evaluate(({
+                    id,
+                    hasPlayFn
+                  }) => __test(id, hasPlayFn), {
+                    id: "example-foo-bar--d"
+                  });
+                  if (globalThis.__sbPostVisit) {
+                    await globalThis.__sbPostVisit(page, context);
+                  }
+                  if (globalThis.__sbCollectCoverage) {
+                    const isCoverageSetupCorrectly = await page.evaluate(() => '__coverage__' in window);
+                    if (!isCoverageSetupCorrectly) {
+                      throw new Error(\`[Test runner] An error occurred when evaluating code coverage:
+          The code in this story is not instrumented, which means the coverage setup is likely not correct.
+          More info: https://github.com/storybookjs/test-runner#setting-up-code-coverage\`);
+                    }
+                    await jestPlaywright.saveCoverage(page);
+                  }
+                  return result;
+                };
+                try {
+                  await testFn();
+                } catch (err) {
+                  if (err.toString().includes('Execution context was destroyed')) {
+                    console.log(\`An error occurred in the following story, most likely because of a navigation: "\${"Example/foo/bar"}/\${"D"}". Retrying...\`);
+                    await jestPlaywright.resetPage();
+                    await globalThis.__sbSetupPage(globalThis.page, globalThis.context);
+                    await testFn();
+                  } else {
+                    throw err;
+                  }
+                }
+              });
+            });
+            describe("E", () => {
+              it("smoke-test", async () => {
+                const testFn = async () => {
+                  const context = {
+                    id: "example-foo-bar--e",
+                    title: "Example/foo/bar",
+                    name: "E"
+                  };
+                  if (globalThis.__sbPreVisit) {
+                    await globalThis.__sbPreVisit(page, context);
+                  }
+                  const result = await page.evaluate(({
+                    id,
+                    hasPlayFn
+                  }) => __test(id, hasPlayFn), {
+                    id: "example-foo-bar--e"
+                  });
+                  if (globalThis.__sbPostVisit) {
+                    await globalThis.__sbPostVisit(page, context);
+                  }
+                  if (globalThis.__sbCollectCoverage) {
+                    const isCoverageSetupCorrectly = await page.evaluate(() => '__coverage__' in window);
+                    if (!isCoverageSetupCorrectly) {
+                      throw new Error(\`[Test runner] An error occurred when evaluating code coverage:
+          The code in this story is not instrumented, which means the coverage setup is likely not correct.
+          More info: https://github.com/storybookjs/test-runner#setting-up-code-coverage\`);
+                    }
+                    await jestPlaywright.saveCoverage(page);
+                  }
+                  return result;
+                };
+                try {
+                  await testFn();
+                } catch (err) {
+                  if (err.toString().includes('Execution context was destroyed')) {
+                    console.log(\`An error occurred in the following story, most likely because of a navigation: "\${"Example/foo/bar"}/\${"E"}". Retrying...\`);
+                    await jestPlaywright.resetPage();
+                    await globalThis.__sbSetupPage(globalThis.page, globalThis.context);
+                    await testFn();
+                  } else {
+                    throw err;
+                  }
+                }
+              });
+            });
+          });
+        }
+      `);
+    });
+    it('should work with tag negation', () => {
+      process.env.STORYBOOK_INCLUDE_TAGS = 'play';
+      // Should result in:
+      // - A being included
+      // - B being excluded
+      expect(
+        transformPlaywright(
+          dedent`
+        export default { title: 'foo/bar', component: Button, tags: ['play'] };
+        export const A = { };
+        export const B = { tags: ['!play']  };
+      `,
+          filename
+        )
+      ).toMatchInlineSnapshot(`
+        if (!require.main) {
+          describe("Example/foo/bar", () => {
+            describe("A", () => {
+              it("smoke-test", async () => {
+                const testFn = async () => {
+                  const context = {
+                    id: "example-foo-bar--a",
+                    title: "Example/foo/bar",
+                    name: "A"
+                  };
+                  if (globalThis.__sbPreVisit) {
+                    await globalThis.__sbPreVisit(page, context);
+                  }
+                  const result = await page.evaluate(({
+                    id,
+                    hasPlayFn
+                  }) => __test(id, hasPlayFn), {
+                    id: "example-foo-bar--a"
+                  });
+                  if (globalThis.__sbPostVisit) {
+                    await globalThis.__sbPostVisit(page, context);
+                  }
+                  if (globalThis.__sbCollectCoverage) {
+                    const isCoverageSetupCorrectly = await page.evaluate(() => '__coverage__' in window);
+                    if (!isCoverageSetupCorrectly) {
+                      throw new Error(\`[Test runner] An error occurred when evaluating code coverage:
+          The code in this story is not instrumented, which means the coverage setup is likely not correct.
+          More info: https://github.com/storybookjs/test-runner#setting-up-code-coverage\`);
+                    }
+                    await jestPlaywright.saveCoverage(page);
+                  }
+                  return result;
+                };
+                try {
+                  await testFn();
+                } catch (err) {
+                  if (err.toString().includes('Execution context was destroyed')) {
+                    console.log(\`An error occurred in the following story, most likely because of a navigation: "\${"Example/foo/bar"}/\${"A"}". Retrying...\`);
+                    await jestPlaywright.resetPage();
+                    await globalThis.__sbSetupPage(globalThis.page, globalThis.context);
+                    await testFn();
+                  } else {
+                    throw err;
+                  }
+                }
+              });
+            });
+          });
+        }
+      `);
+    });
+    it('should include "test" tag by default', () => {
+      // Should result in:
+      // - A being included
+      // - B being excluded
+      expect(
+        transformPlaywright(
+          dedent`
+        export default { title: 'foo/bar', component: Button };
+        export const A = { };
+        export const B = { tags: ['!test']  };
+      `,
+          filename
+        )
+      ).toMatchInlineSnapshot(`
+        if (!require.main) {
+          describe("Example/foo/bar", () => {
+            describe("A", () => {
+              it("smoke-test", async () => {
+                const testFn = async () => {
+                  const context = {
+                    id: "example-foo-bar--a",
+                    title: "Example/foo/bar",
+                    name: "A"
+                  };
+                  if (globalThis.__sbPreVisit) {
+                    await globalThis.__sbPreVisit(page, context);
+                  }
+                  const result = await page.evaluate(({
+                    id,
+                    hasPlayFn
+                  }) => __test(id, hasPlayFn), {
+                    id: "example-foo-bar--a"
+                  });
+                  if (globalThis.__sbPostVisit) {
+                    await globalThis.__sbPostVisit(page, context);
+                  }
+                  if (globalThis.__sbCollectCoverage) {
+                    const isCoverageSetupCorrectly = await page.evaluate(() => '__coverage__' in window);
+                    if (!isCoverageSetupCorrectly) {
+                      throw new Error(\`[Test runner] An error occurred when evaluating code coverage:
+          The code in this story is not instrumented, which means the coverage setup is likely not correct.
+          More info: https://github.com/storybookjs/test-runner#setting-up-code-coverage\`);
+                    }
+                    await jestPlaywright.saveCoverage(page);
+                  }
+                  return result;
+                };
+                try {
+                  await testFn();
+                } catch (err) {
+                  if (err.toString().includes('Execution context was destroyed')) {
+                    console.log(\`An error occurred in the following story, most likely because of a navigation: "\${"Example/foo/bar"}/\${"A"}". Retrying...\`);
+                    await jestPlaywright.resetPage();
+                    await globalThis.__sbSetupPage(globalThis.page, globalThis.context);
+                    await testFn();
+                  } else {
+                    throw err;
+                  }
+                }
+              });
+            });
           });
         }
       `);

src/playwright/transformPlaywright.ts

@@ -75,11 +75,13 @@ const makeTitleFactory = (filename: string) => {
 };
 
 export const transformPlaywright = (src: string, filename: string) => {
+  const tags = process.env.STORYBOOK_PREVIEW_TAGS?.split(',') ?? [];
   const transformOptions = {
     testPrefixer,
     insertTestIfEmpty: true,
     clearBody: true,
     makeTitle: makeTitleFactory(filename),
+    previewAnnotations: { tags },
   };
 
   const result = transformCsf(src, transformOptions);