test file not exist error

internal/resource/file.go

@@ -160,7 +160,8 @@ func (f *File) Read(ctx context.Context) ([]byte, error) {
   info, e := os.Stat(f.Path)
 
   if e != nil {
-    panic(e)
+    f.State = "absent"
+    return nil, e
   }
 
   f.Mtime = info.ModTime()

internal/resource/file_test.go

@@ -77,6 +77,18 @@ func TestReadFile(t *testing.T) {
 	assert.YAMLEq(t, expected, string(r))
 }
 
+func TestReadFileError(t *testing.T) {
+  ctx := context.Background()
+  file, _ := filepath.Abs(filepath.Join(TempDir, "missingfile.txt"))
+
+  f := NewFile()
+  assert.NotEqual(t, nil, f)
+  f.Path = file
+  _, e := f.Read(ctx)
+  assert.True(t, os.IsNotExist(e))
+  assert.Equal(t, "absent", f.State)
+}
+
 func TestCreateFile(t *testing.T) {
 	file, _ := filepath.Abs(filepath.Join(TempDir, "foo.txt"))