Implement option to write output to a file in ec test

cmd/test/test.go

@@ -118,6 +118,7 @@
  "no-fail",
  "suppress-exceptions",
  "output",
+ "file",
  "parser",
  "policy",
  "proto-file-dirs",
@@ -150,6 +151,11 @@
  return fmt.Errorf("unmarshal parameters: %w", err)
  }
 
+ outputFilePath, err := cmd.Flags().GetString("file")
+ if err != nil {
+ return fmt.Errorf("reading flag: %w", err)
+ }
+
  results, resultsErr := runner.Run(ctx, fileList)
  var exitCode int
  if runner.FailOnWarn {
@@ -171,7 +177,14 @@
  if err != nil {
  return appstudioErrorHandler(runner.NoFail, "output results", err)
  }
- fmt.Printf("%s\n", reportOutput)
+
+ if outputFilePath != "" {
+ err := os.WriteFile(outputFilePath, reportOutput, 0600)
+ if err != nil {
+ return fmt.Errorf("creating output file: %w", err)
+ }
+ }
+ fmt.Fprintln(cmd.OutOrStdout(), string(reportOutput)+"\n")
 
  } else {
  // Conftest handles the output
@@ -180,15 +193,33 @@
  return fmt.Errorf("running test: %w", resultsErr)
  }
 
+ var outputFile *os.File
+ if outputFilePath != "" {
+ outputFile, err = os.Create(outputFilePath)
+ if err != nil {
+ return fmt.Errorf("creating output file: %w", err)
+ }
+ defer outputFile.Close()
+ }
+
  outputter := output.Get(runner.Output, output.Options{
  NoColor: runner.NoColor,
  SuppressExceptions: runner.SuppressExceptions,
  Tracing: runner.Trace,
  JUnitHideMessage: viper.GetBool("junit-hide-message"),
+ File: outputFile,
  })
  if err := outputter.Output(results); err != nil {
  return fmt.Errorf("output results: %w", err)
  }
+
+ if outputFilePath != "" {
+ contents, err := os.ReadFile(outputFile.Name())
+ if err != nil {
+ return fmt.Errorf("copying output file to stdout: %w", err)
+ }
+ fmt.Fprintln(cmd.OutOrStdout(), string(contents))
+ }
  }
 
  // When the no-fail parameter is set, there is no need to figure out the error code
@@ -219,6 +250,7 @@
  cmd.Flags().String("capabilities", "", "Path to JSON file that can restrict opa functionality against a given policy. Default: all operations allowed")
 
  cmd.Flags().StringP("output", "o", output.OutputStandard, fmt.Sprintf("Output format for conftest results - valid options are: %s", append(output.Outputs(), OutputAppstudio)))
+ cmd.Flags().String("file", "", "File path to write output to")
  cmd.Flags().Bool("junit-hide-message", false, "Do not include the violation message in the JUnit test name")
 
  cmd.Flags().StringSliceP("policy", "p", []string{"policy"}, "Path to the Rego policy files directory")