Function TestScanRespectsGitignoreNestedNegation

agent/agentgit/agentgit_test.go:188–230

(t *testing.T)

}

func TestScanRespectsGitignoreNestedNegation(t *testing.T) {
	t.Parallel()

	repoDir := initTestRepo(t)
	logger := slogtest.Make(t, nil)

	// Add a .gitignore that ignores node_modules/.
	require.NoError(t, os.WriteFile(filepath.Join(repoDir, ".gitignore"), []byte("node_modules/\n"), 0o600))
	gitCmd(t, repoDir, "add", ".gitignore")
	gitCmd(t, repoDir, "commit", "-m", "add gitignore")

	// Simulate the tailwindcss stubs directory which contains a nested
	// .gitignore with "!*" (negation that un-ignores everything).
	// Real git keeps the parent node_modules/ ignore rule, but go-git
	// incorrectly lets the child negation override it.
	stubsDir := filepath.Join(repoDir, "site", "node_modules", ".pnpm",
		"tailwindcss@3.4.18", "node_modules", "tailwindcss", "stubs")
	require.NoError(t, os.MkdirAll(stubsDir, 0o700))
	require.NoError(t, os.WriteFile(filepath.Join(stubsDir, ".gitignore"), []byte("!*\n"), 0o600))
	require.NoError(t, os.WriteFile(filepath.Join(stubsDir, "config.full.js"), []byte("module.exports = {}\n"), 0o600))
	require.NoError(t, os.WriteFile(filepath.Join(stubsDir, "tailwind.config.js"), []byte("// tw config\n"), 0o600))

	// Also create a normal file outside node_modules.
	require.NoError(t, os.WriteFile(filepath.Join(repoDir, "main.go"), []byte("package main\n"), 0o600))

	h := agentgit.NewHandler(logger)
	h.Subscribe([]string{filepath.Join(repoDir, "main.go")})

	ctx := context.Background()
	msg := h.Scan(ctx)
	require.NotNil(t, msg)
	require.Len(t, msg.Repositories, 1)

	diff := msg.Repositories[0].UnifiedDiff

	// The non-ignored file should appear in the diff.
	assert.Contains(t, diff, "main.go")
	// Files inside node_modules must not appear even though a nested
	// .gitignore contains "!*". The parent node_modules/ rule takes
	// precedence in real git.
	assert.NotContains(t, diff, "config.full.js")
	assert.NotContains(t, diff, "tailwind.config.js")
}

func TestScanDeltaEmission(t *testing.T) {
	t.Parallel()