Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/util/label_observer_unittest.mm

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/chrome/browser/ui/util/label_observer.h"
+
+#import "base/mac/scoped_nsobject.h"
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest_mac.h"
+#include "testing/platform_test.h"
+#include "url/gurl.h"
+
+namespace {
+
+class LabelObserverTest : public PlatformTest {
+ protected:
+  void SetUp() override {
+    label_.reset([[UILabel alloc] initWithFrame:CGRectZero]);
+  }
+
+  UILabel* label() { return label_.get(); }
+  LabelObserver* observer() { return [LabelObserver observerForLabel:label()]; }
+
+  base::scoped_nsobject<UILabel> label_;
+};
+
+// Tests that all types of LabelObserverActions are successfully called.
+TEST_F(LabelObserverTest, SimpleTest) {
+  __block BOOL text_action_called = NO;
+  [observer() addTextChangedAction:^(UILabel* label) {
+    text_action_called = YES;
+  }];
+  label().text = @"text";
+  EXPECT_TRUE(text_action_called);
+  __block BOOL layout_action_called = NO;
+  [observer() addLayoutChangedAction:^(UILabel* label) {
+    layout_action_called = YES;
+  }];
+  [label() sizeToFit];
+  EXPECT_TRUE(layout_action_called);
+  __block BOOL style_action_called = NO;
+  [observer() addStyleChangedAction:^(UILabel* label) {
+    style_action_called = YES;
+  }];
+  label().textColor = [UIColor blueColor];
+  EXPECT_TRUE(style_action_called);
+}
+
+// Tests that a LabelObserverAction that causes another KVO callback does not
+// get called twice
+TEST_F(LabelObserverTest, CallCountTest) {
+  __block NSUInteger text_action_call_count = 0;
+  [observer() addTextChangedAction:^(UILabel* label) {
+    ++text_action_call_count;
+    label.text = [label.text stringByAppendingString:@"x"];
+  }];
+  label().text = @"x";
+  EXPECT_EQ(1U, text_action_call_count);
+  EXPECT_NSEQ(label().text, @"xx");
+}
+
+// Tests that LabelObserverActions are called in the same order in which they
+// are added.
+TEST_F(LabelObserverTest, ObserverActionOrderTest) {
+  __block BOOL first_action_called = NO;
+  __block BOOL second_action_called = NO;
+  [observer() addTextChangedAction:^(UILabel* label) {
+    EXPECT_FALSE(first_action_called);
+    EXPECT_FALSE(second_action_called);
+    first_action_called = YES;
+  }];
+  [observer() addTextChangedAction:^(UILabel* label) {
+    EXPECT_TRUE(first_action_called);
+    EXPECT_FALSE(second_action_called);
+    second_action_called = YES;
+  }];
+  label().text = @"test";
+  EXPECT_TRUE(first_action_called);
+  EXPECT_TRUE(second_action_called);
+}
+
+}  // namespace