Function TestImportCycleDetection_FourFiles

pkg/parser/import_cycle_test.go:67–146

TestImportCycleDetection_FourFiles tests that a 4-file cycle (A→B→C→D→B) is detected This is the exact scenario from the issue requirements

(t *testing.T)

// TestImportCycleDetection_FourFiles tests that a 4-file cycle (A→B→C→D→B) is detected
// This is the exact scenario from the issue requirements
func TestImportCycleDetection_FourFiles(t *testing.T) {
	tempDir := testutil.TempDir(t, "test-*")

	// Create workflow A that imports B
	fileA := filepath.Join(tempDir, "a.md")
	fileAContent := `---
imports:
  - b.md
---
# Workflow A
`
	require.NoError(t, os.WriteFile(fileA, []byte(fileAContent), 0644), "Failed to write file A")

	// Create file B that imports C
	fileB := filepath.Join(tempDir, "b.md")
	fileBContent := `---
imports:
  - c.md
---
# File B
`
	require.NoError(t, os.WriteFile(fileB, []byte(fileBContent), 0644), "Failed to write file B")

	// Create file C that imports D
	fileC := filepath.Join(tempDir, "c.md")
	fileCContent := `---
imports:
  - d.md
---
# File C
`
	require.NoError(t, os.WriteFile(fileC, []byte(fileCContent), 0644), "Failed to write file C")

	// Create file D that imports B (creating cycle back to B)
	fileD := filepath.Join(tempDir, "d.md")
	fileDContent := `---
imports:
  - b.md
---
# File D
`
	require.NoError(t, os.WriteFile(fileD, []byte(fileDContent), 0644), "Failed to write file D")

	// Process imports from file A - should detect cycle B→C→D→B
	frontmatter := map[string]any{
		"imports": []string{"b.md"},
	}

	_, err := parser.ProcessImportsFromFrontmatterWithSource(frontmatter, tempDir, nil, fileA, fileAContent)
	require.Error(t, err, "Should detect import cycle")

	// Verify error is an ImportCycleError
	var cycleErr *parser.ImportCycleError
	require.ErrorAs(t, err, &cycleErr, "Error should be ImportCycleError")

	if cycleErr != nil {
		// Verify the full chain is present
		assert.NotEmpty(t, cycleErr.Chain, "Cycle chain should not be empty")