add test for osv-scan parser not erroring when receiving an empty file

Author: northdpole

components/scanners/osv-scanner/internal/transformer/testdata/empty.json

@@ -121,10 +121,12 @@ func (b *OSVScannerTransformer) Transform(ctx context.Context) ([]*ocsf.Vulnerab
 	if err != nil {
 		return nil, errors.Errorf("could not read file %s", b.rawOutFile)
 	}
+
 	if len(fileContents) == 0 {
 		logger.Info("Scanner SARIF file is empty, exiting")
 		return []*ocsf.VulnerabilityFinding{}, nil
 	}
+
 	var report sarifschemav210.SchemaJson
 	if err := report.UnmarshalJSON(fileContents); err != nil {
 		return nil, errors.Errorf("%w: %w", ErrMalformedSARIFfile, err)

components/scanners/osv-scanner/internal/transformer/transformer.go

@@ -41,9 +41,11 @@ func TestTransformer_Transform(t *testing.T) {
 		transformMethodTest(t, ocsfTransformer.Transform, nil, 11)
 	})
 	t.Run("it should exit cleanly when there are no results", func(t *testing.T) {
-		path, err := os.Getwd()
-		require.NoError(t, err)
-		os.Setenv("RAW_OUT_FILE", "./testdata/empty.json")
+
+		path := filepath.Join(t.TempDir(), "empty.sarif.json")
+		require.NoError(t, os.WriteFile(path, []byte("{}"), 0644))
+		os.Setenv("RAW_OUT_FILE", path)
+
 		ocsfTransformer, err := New(
 			OSVScannerTransformerWithClock(clock),
 			OSVScannerTransformerWithProjectRoot(filepath.Join(path, ".")),