Remove GenericController and add tests

pkg/nginx/controller/utils_test.go

@@ -1,41 +0,0 @@
-/*
-Copyright 2015 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 controller
-
-import "testing"
-
-func TestDiff(t *testing.T) {
-	tests := []struct {
-		a     []byte
-		b     []byte
-		empty bool
-	}{
-		{[]byte(""), []byte(""), true},
-		{[]byte("a"), []byte("a"), true},
-		{[]byte("a"), []byte("b"), false},
-	}
-
-	for _, test := range tests {
-		b, err := diff(test.a, test.b)
-		if err != nil {
-			t.Fatalf("unexpected error returned: %v", err)
-		}
-		if len(b) == 0 && !test.empty {
-			t.Fatalf("expected empty but returned %s", b)
-		}
-	}
-}