[Mac] Properly show and hide the avatar button for the one-profile case.

chrome/browser/ui/cocoa/browser/avatar_button_controller_unittest.mm

Index: chrome/browser/ui/cocoa/browser/avatar_button_controller_unittest.mm
diff --git a/chrome/browser/ui/cocoa/browser/avatar_button_controller_unittest.mm b/chrome/browser/ui/cocoa/browser/avatar_button_controller_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..61abbb9645a1c1df1ffc51454d40b4e3e73ea98d
--- /dev/null
+++ b/chrome/browser/ui/cocoa/browser/avatar_button_controller_unittest.mm
@@ -0,0 +1,44 @@
+// Copyright (c) 2011 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.
+
+#import "chrome/browser/ui/cocoa/browser/avatar_button_controller.h"
+
+#include "base/memory/scoped_nsobject.h"
+#include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
+#include "chrome/browser/ui/cocoa/run_loop_testing.h"
+
+class AvatarButtonControllerTest : public CocoaProfileTest {
+ public:
+  virtual void SetUp() {
+    CocoaProfileTest::SetUp();
+    ASSERT_TRUE(browser());
+    browser()->InitBrowserWindow();
+
+    controller_.reset(
+        [[AvatarButtonController alloc] initWithBrowser:browser()]);
+    [[controller_ view] setHidden:YES];
+  }
+
+  NSButton* button() { return [controller_ buttonView]; }
+
+ private:
+  scoped_nsobject<AvatarButtonController> controller_;
+};
+
+TEST_F(AvatarButtonControllerTest, AddRemoveProfiles) {
+  EXPECT_TRUE([button() isHidden]);
+
+  testing_profile_manager()->CreateTestingProfile("one");
+
+  EXPECT_FALSE([button() isHidden]);
+
+  testing_profile_manager()->CreateTestingProfile("two");
+  EXPECT_FALSE([button() isHidden]);
+
+  testing_profile_manager()->DeleteTestingProfile("one");
+  EXPECT_FALSE([button() isHidden]);
+
+  testing_profile_manager()->DeleteTestingProfile("two");
+  EXPECT_TRUE([button() isHidden]);
+}