some tests for new function

staging/src/k8s.io/code-generator/cmd/go-to-protobuf/protobuf/parser_test.go

@@ -0,0 +1,99 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package protobuf
+
+import (
+	"go/ast"
+	"testing"
+)
+
+func TestProtoParser(t *testing.T) {
+	ident := ast.NewIdent("FieldName")
+	tests := []struct {
+		expr ast.Expr
+		err  bool
+	}{
+		{
+			expr: ident,
+			err:  false,
+		},
+		{
+			expr: &ast.SelectorExpr{
+				Sel: ident,
+			},
+			err: false,
+		},
+		{
+			expr: &ast.StarExpr{
+				X: ident,
+			},
+			err: false,
+		},
+		{
+			expr: &ast.StarExpr{
+				X: &ast.StarExpr{
+					X: ident,
+				},
+			},
+			err: false,
+		},
+		{
+			expr: &ast.StarExpr{
+				X: &ast.SelectorExpr{
+					Sel: ident,
+				},
+			},
+			err: false,
+		},
+
+		{
+			expr: &ast.KeyValueExpr{
+				Key:   ident,
+				Colon: 0,
+				Value: ident,
+			},
+			err: true,
+		},
+		{
+			expr: &ast.StarExpr{
+				X: &ast.KeyValueExpr{
+					Key:   ident,
+					Colon: 0,
+					Value: ident,
+				},
+			},
+			err: true,
+		},
+	}
+
+	for _, test := range tests {
+		actual, err := getFieldName(test.expr, "Struct")
+		if !test.err {
+			if err != nil {
+				t.Errorf("%s: unexpected error %s", test.expr, err)
+			} else {
+				if actual != ident.Name {
+					t.Errorf("%s: expected %s, got %s", test.expr, ident.Name, actual)
+				}
+			}
+		} else {
+			if err == nil {
+				t.Errorf("%s: expected error did not occur, got %s instead", test.expr, actual)
+			}
+		}
+	}
+}