if c.fileContents != "" {
				err := os.WriteFile(filepath.Join(c.dir, c.inFilename), []byte(c.fileContents), 0o644)
				if err != nil {
					t.Fatal(err)
				}
			}

			result, err := getDefaultCNINetwork(c.dir)
			if (c.expectedFailure && err == nil) || (!c.expectedFailure && err != nil) {
				t.Fatalf("expected failure: %t, got %v", c.expectedFailure, err)
			}

			if c.fileContents != "" {