test: use github mock instead of fixture for context

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

__tests__/context.test.ts

@@ -1,34 +1,12 @@
-import {afterEach, beforeEach, describe, expect, test, it, vi} from 'vitest';
-import * as dotenv from 'dotenv';
-import * as fs from 'fs';
-import * as path from 'path';
+import {beforeEach, describe, expect, test, it, vi} from 'vitest';
 import {Context} from '@actions/github/lib/context.js';
 import {Git} from '@docker/actions-toolkit/lib/git.js';
-import {GitHub} from '@docker/actions-toolkit/lib/github.js';
 import {Toolkit} from '@docker/actions-toolkit/lib/toolkit.js';
 
 import * as context from '../src/context.js';
 
 const toolkit = new Toolkit({githubToken: 'fake-github-token'});
 
-beforeEach(() => {
-  vi.clearAllMocks();
-  vi.spyOn(GitHub, 'context', 'get').mockImplementation((): Context => {
-    const ctx = new Context();
-    const payload = ctx.payload as {
-      commits?: Array<{id: string; timestamp: string}>;
-      head_commit?: {id: string; timestamp: string};
-    };
-    if (ctx.sha && !payload.commits?.length && !payload.head_commit) {
-      payload.head_commit = {
-        id: ctx.sha,
-        timestamp: '2024-11-13T13:42:28.000Z'
-      };
-    }
-    return ctx;
-  });
-});
-
 describe('getInputs', () => {
   beforeEach(() => {
     process.env = Object.keys(process.env).reduce((object, key) => {
@@ -113,24 +91,12 @@ describe('getInputs', () => {
 });
 
 describe('getContext', () => {
-  const originalEnv = process.env;
-  beforeEach(() => {
-    process.env = {
-      ...originalEnv,
-      ...dotenv.parse(fs.readFileSync(path.join(__dirname, 'fixtures/event_create_branch.env')))
-    };
-  });
-  afterEach(() => {
-    process.env = originalEnv;
-  });
-
   it('workflow', async () => {
     const ctx = await context.getContext(context.ContextSource.workflow, toolkit);
     expect(ctx.ref).toEqual('refs/heads/dev');
     expect(ctx.sha).toEqual('5f3331d7f7044c18ca9f12c77d961c4d7cf3276a');
     expect(ctx.commitDate).toEqual(new Date('2024-11-13T13:42:28.000Z'));
   });
-
   it('git', async () => {
     vi.spyOn(Git, 'context').mockImplementation((): Promise<Context> => {
       return Promise.resolve({

__tests__/setup.unit.ts

@@ -1,4 +1,5 @@
 import fs from 'node:fs';
+import {createRequire} from 'node:module';
 import os from 'node:os';
 import path from 'node:path';
 import {vi} from 'vitest';
@@ -12,13 +13,17 @@ process.env = Object.assign({}, process.env, {
   RUNNER_TOOL_CACHE: path.join(tmpDir, 'runner-tool-cache')
 });
 
-vi.mock('@actions/github', () => ({
+const require = createRequire(import.meta.url);
+type RequireCacheEntry = NonNullable<(typeof require.cache)[string]>;
+
+const githubMock = {
   context: {
     repo: {
       owner: 'docker',
       repo: 'actions-toolkit'
     },
-    ref: 'refs/heads/master',
+    ref: 'refs/heads/dev',
+    sha: '5f3331d7f7044c18ca9f12c77d961c4d7cf3276a',
     runId: 2188748038,
     runNumber: 15,
     payload: {
@@ -232,4 +237,23 @@ vi.mock('@actions/github', () => ({
       }
     }
   })
-}));
+};
+
+vi.mock('@actions/github', () => githubMock);
+
+for (const mod of ['@actions/github', '@docker/actions-toolkit/node_modules/@actions/github']) {
+  try {
+    const resolved = require.resolve(mod);
+    vi.doMock(resolved, () => githubMock);
+    require.cache[resolved] = {
+      id: resolved,
+      filename: resolved,
+      loaded: true,
+      exports: githubMock,
+      children: [],
+      paths: []
+    } as RequireCacheEntry;
+  } catch {
+    // Ignore unresolved optional paths; vi.mock handles module-level mocking.
+  }
+}