adding unit tests for file mode

builtin/audit/file/backend_test.go

@@ -0,0 +1,78 @@
+package file
+
+import (
+	"os"
+	"strconv"
+	"testing"
+
+	"github.com/hashicorp/vault/audit"
+	"github.com/hashicorp/vault/helper/salt"
+)
+
+func TestAuditFile_fileModeNew(t *testing.T) {
+	salter, _ := salt.NewSalt(nil, nil)
+	
+	modeStr := "0777"
+	mode, err := strconv.ParseUint(modeStr, 8, 32)
+	
+	file := "auditTest.txt"
+	
+	config := map[string]string{
+		"path": file,
+		"mode": modeStr,
+	}
+
+	_, err = Factory(&audit.BackendConfig{
+		Salt:   salter,
+		Config: config,
+	})
+	
+	if err != nil {
+		t.Fatalf("%v", err)
+	}
+
+    info,_ := os.Stat(file)
+    createdMode := info.Mode()
+	if createdMode != os.FileMode(mode) {
+		t.Fatalf("File Mode does not match.")
+	}
+	
+	err = os.Remove(file)
+}
+
+func TestAuditFile_fileModeExisting(t *testing.T) {
+	salter, _ := salt.NewSalt(nil, nil)
+	
+	modeStr := "0600"
+	m, err := strconv.ParseUint(modeStr, 8, 32)
+	mode := os.FileMode(m)
+	
+	file := "auditTest.txt"
+	
+	f, err := os.OpenFile(file, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0777)
+	err = f.Close()
+	if err != nil {
+		t.Fatalf("Failure to close the file.")
+	}
+	
+	config := map[string]string{
+		"path": file,
+	}
+
+	_, err = Factory(&audit.BackendConfig{
+		Salt:   salter,
+		Config: config,
+	})
+	
+	if err != nil {
+		t.Fatalf("%v", err)
+	}
+
+    info,_ := os.Stat(file)
+    createdMode := info.Mode()
+	if createdMode != mode {
+		t.Fatalf("File Mode does not match.")
+	}
+	
+	err = os.Remove(file)
+}