Re-introduce the partial magnifier

chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc

Index: chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc b/chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc
index 6a1a89a54ac8f8dae03fc203f90adc96a354f38f..86c918a8eee82ee3e7840894b07a28b80b86b813 100644
--- a/chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc
+++ b/chrome/browser/chromeos/accessibility/magnification_manager_browsertest.cc
@@ -24,11 +24,67 @@
 
 namespace chromeos {
 
+namespace {
+
+void SetMagnifierEnabled(bool enabled) {
+  MagnificationManager::Get()->SetMagnifierEnabled(enabled);
+}
+
+void SetMagnifierType(ash::MagnifierType type) {
+  MagnificationManager::Get()->SetMagnifierType(type);
+}
+
+void SetFullScreenMagnifierScale(double scale) {
+  ash::Shell::GetInstance()->
+      magnification_controller()->SetScale(scale, false);
+}
+
+double GetFullScreenMagnifierScale() {
+  return ash::Shell::GetInstance()->magnification_controller()->GetScale();
+}
+
+void SetSavedFullScreenMagnifierScale(double scale) {
+  MagnificationManager::Get()->SaveScreenMagnifierScale(scale);
+}
+
+double GetSavedFullScreenMagnifierScale() {
+  return MagnificationManager::Get()->GetSavedScreenMagnifierScale();
+}
+
+ash::MagnifierType GetMagnifierType() {
+  return MagnificationManager::Get()->GetMagnifierType();
+}
+
+bool IsMagnifierEnabled() {
+  return MagnificationManager::Get()->IsMagnifierEnabled();
+}
+
+Profile* profile() {
+  Profile* profile = ProfileManager::GetDefaultProfileOrOffTheRecord();
+  DCHECK(profile);
+  return profile;
+}
+
+PrefServiceBase* prefs() {
+  return PrefServiceBase::FromBrowserContext(profile());
+}
+
+void EnableScreenManagnifierToPref(bool enabled) {
+  prefs()->SetBoolean(prefs::kScreenMagnifierEnabled, enabled);
+}
+
+void SetScreenManagnifierTypeToPref(ash::MagnifierType type) {
+  prefs()->SetInteger(prefs::kScreenMagnifierType, type);
+}
+
+}  // anonymouse namespace
+
 class MagnificationManagerTest : public CrosInProcessBrowserTest,
                                  public content::NotificationObserver {
  protected:
   MagnificationManagerTest() : observed_(false),
-                               observed_type_(ash::MAGNIFIER_OFF) {}
+                               observed_enabled_(false),
+                               observed_type_(ash::DEFAULT_MAGNIFIER_TYPE) {}
   virtual ~MagnificationManagerTest() {}
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
@@ -37,16 +93,6 @@ class MagnificationManagerTest : public CrosInProcessBrowserTest,
                                     TestingProfile::kTestUserProfileDir);
   }
 
-  Profile* profile() {
-    Profile* profile = ProfileManager::GetDefaultProfileOrOffTheRecord();
-    DCHECK(profile);
-    return profile;
-  }
-
-  PrefServiceBase* prefs() {
-    return PrefServiceBase::FromBrowserContext(profile());
-  }
-
   virtual void SetUpOnMainThread() OVERRIDE {
     registrar_.Add(
         this,
@@ -54,37 +100,6 @@ class MagnificationManagerTest : public CrosInProcessBrowserTest,
         content::NotificationService::AllSources());
   }
 
-  void SetScreenManagnifierType(ash::MagnifierType type) {
-    MagnificationManager::Get()->SetMagnifier(type);
-  }
-
-  void SetScreenManagnifierTypeToPref(ash::MagnifierType type) {
-    prefs()->SetBoolean(prefs::kScreenMagnifierEnabled,
-                        (type != ash::MAGNIFIER_OFF) ? true : false);
-  }
-
-  void SetFullScreenMagnifierScale(double scale) {
-    ash::Shell::GetInstance()->
-        magnification_controller()->SetScale(scale, false);
-  }
-
-  double GetFullScreenMagnifierScale() {
-    return ash::Shell::GetInstance()->magnification_controller()->GetScale();
-  }
-
-  void SetSavedFullScreenMagnifierScale(double scale) {
-    MagnificationManager::Get()->SaveScreenMagnifierScale(scale);
-  }
-
-  double GetSavedFullScreenMagnifierScale() {
-    return MagnificationManager::Get()->GetSavedScreenMagnifierScale();
-  }
-
-  void CheckCurrentMagnifierType(
-      ash::MagnifierType type) {
-    EXPECT_EQ(MagnificationManager::Get()->GetMagnifierType(), type);
-  }
-
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
@@ -96,14 +111,15 @@ class MagnificationManagerTest : public CrosInProcessBrowserTest,
                 details).ptr();
 
         observed_ = true;
-        observed_type_ = accessibility_status->enabled ? ash::MAGNIFIER_FULL :
-                                                         ash::MAGNIFIER_OFF;
+        observed_enabled_ = accessibility_status->enabled;
+        observed_type_ = accessibility_status->magnifier_type;
         break;
       }
     }
   }
 
   bool observed_;
+  bool observed_enabled_;
   ash::MagnifierType observed_type_;
   content::NotificationRegistrar registrar_;
   DISALLOW_COPY_AND_ASSIGN(MagnificationManagerTest);
@@ -111,121 +127,200 @@ class MagnificationManagerTest : public CrosInProcessBrowserTest,
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginOffToOff) {
   // Confirms that magnifier is disabled on the login screen.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Logs in.
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
 
   // Confirms that magnifier is still disabled just after login.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   UserManager::Get()->SessionStarted();
 
   // Confirms that magnifier is still disabled just after login.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Enables magnifier.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
   // Confirms that magnifier is enabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToOff) {
   // Confirms that magnifier is disabled on the login screen.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Enables magnifier on login scren.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
 
   // Logs in (but the session is not started yet).
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
   // Confirms that magnifier is keeping enabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   UserManager::Get()->SessionStarted();
 
   // Confirms that magnifier is disabled just after login.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginOffToFull) {
   // Changes to full screen magnifier again and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Logs in (but the session is not started yet).
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
 
   // Confirms that magnifier is keeping disabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
   // Enable magnifier on the pref.
+  EnableScreenManagnifierToPref(true);
   SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
   SetSavedFullScreenMagnifierScale(2.5);
 
   UserManager::Get()->SessionStarted();
 
   // Confirms that the prefs are successfully loaded.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
 }
 
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginOffToPartial) {
+  // Changes to full screen magnifier again and confirms that.
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
+
+  // Logs in (but the session is not started yet).
+  UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
+
+  // Confirms that magnifier is keeping disabled.
+  EXPECT_FALSE(IsMagnifierEnabled());
+  // Enable magnifier on the pref.
+  EnableScreenManagnifierToPref(true);
+  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_PARTIAL);
+
+  UserManager::Get()->SessionStarted();
+
+  // Confirms that the prefs are successfully loaded.
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  // Full screen magnifier scale is 1.0x since it's 'partial' magnifier.
+  EXPECT_EQ(1.0, GetFullScreenMagnifierScale());
+}
+
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToFull) {
   // Changes to full screen magnifier again and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Logs in (but the session is not started yet).
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
 
   // Confirms that magnifier is keeping enabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   // Enable magnifier on the pref.
+  EnableScreenManagnifierToPref(true);
   SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
   SetSavedFullScreenMagnifierScale(2.5);
 
   UserManager::Get()->SessionStarted();
 
   // Confirms that the prefs are successfully loaded.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
 }
 
-IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ChangeMagnifierType) {
-  // Changes to full screen magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
-
-  // Changes to partial screen magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_PARTIAL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_PARTIAL);
-
-  // Disable magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
-
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, LoginFullToPartial) {
   // Changes to full screen magnifier again and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
-  // Logs in
+  // Logs in (but the session is not started yet).
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
-  UserManager::Get()->SessionStarted();
 
-  // Changes to full screen magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  // Confirms that magnifier is keeping enabled.
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+  // Enable magnifier on the pref.
+  EnableScreenManagnifierToPref(true);
+  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_PARTIAL);
 
-  // Changes to partial screen magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_PARTIAL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_PARTIAL);
+  UserManager::Get()->SessionStarted();
 
-  // Disable magnifier and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  // Confirms that the prefs are successfully loaded.
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
 
-  // Changes to full screen magnifier again and confirms that.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  // Full screen magnifier scale is 1.0x since it's 'partial' magnifier.
+  EXPECT_EQ(1.0, GetFullScreenMagnifierScale());
+}
+
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ChangeMagnifierType) {
+  // Enables/disables full screen magnifier.
+  SetMagnifierEnabled(false);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  // Enables/disables partial screen magnifier.
+  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  // Changes the magnifier type when the magnifier is enabled.
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  // Changes the magnifier type when the magnifier is disabled.
+  SetMagnifierEnabled(false);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
+
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_FALSE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, TypePref) {
@@ -234,48 +329,75 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, TypePref) {
   UserManager::Get()->SessionStarted();
 
   // Confirms that magnifier is disabled just after login.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Sets the pref as true to enable magnifier.
   SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
+  EnableScreenManagnifierToPref(true);
   // Confirms that magnifier is enabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+
+  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_PARTIAL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
 
   // Sets the pref as false to disabled magnifier.
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_OFF);
+  EnableScreenManagnifierToPref(false);
   // Confirms that magnifier is disabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Sets the pref as true to enable magnifier again.
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
+  EnableScreenManagnifierToPref(true);
   // Confirms that magnifier is enabled.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
 }
 
-IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ResumeSavedTypePref) {
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ResumeSavedTypeFullPref) {
   // Loads the profile of the user.
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
 
   // Sets the pref as true to enable magnifier before login.
+  EnableScreenManagnifierToPref(true);
   SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
 
   // Logs in.
   UserManager::Get()->SessionStarted();
 
   // Confirms that magnifier is enabled just after login.
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
+}
+
+IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ResumeSavedTypePartialPref) {
+  // Loads the profile of the user.
+  UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
+
+  // Sets the pref as true to enable magnifier before login.
+  EnableScreenManagnifierToPref(true);
+  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_PARTIAL);
+
+  // Logs in.
+  UserManager::Get()->SessionStarted();
+
+  // Confirms that magnifier is enabled just after login.
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, GetMagnifierType());
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ScalePref) {
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Sets 2.5x to the pref.
   SetSavedFullScreenMagnifierScale(2.5);
 
   // Enables full screen magnifier.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that 2.5x is restored.
   EXPECT_EQ(2.5, GetFullScreenMagnifierScale());
@@ -286,30 +408,33 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, ScalePref) {
 }
 
 IN_PROC_BROWSER_TEST_F(MagnificationManagerTest, InvalidScalePref) {
-  // TEST 1: too small scale
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  // TEST 1: Sets too small scale
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Sets too small value to the pref.
   SetSavedFullScreenMagnifierScale(0.5);
 
   // Enables full screen magnifier.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that the actual scale is set to the minimum scale.
   EXPECT_EQ(1.0, GetFullScreenMagnifierScale());
 
-  // TEST 2: too large scale
-  SetScreenManagnifierType(ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  // TEST 2: Sets too large scale
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(IsMagnifierEnabled());
 
   // Sets too large value to the pref.
   SetSavedFullScreenMagnifierScale(50.0);
 
   // Enables full screen magnifier.
-  SetScreenManagnifierType(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, GetMagnifierType());
 
   // Confirms that the actual scale is set to the maximum scale.
   EXPECT_EQ(4.0, GetFullScreenMagnifierScale());
@@ -321,30 +446,53 @@ IN_PROC_BROWSER_TEST_F(MagnificationManagerTest,
   UserManager::Get()->UserLoggedIn("owner@invalid.domain", true);
   UserManager::Get()->SessionStarted();
 
-  // Before the test, sets to full magnifier.
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  // Enable magnifier (without type)
+  EnableScreenManagnifierToPref(true);
+  EXPECT_TRUE(observed_);
 
   // Disables magnifier and confirms observer is invoked.
   observed_ = false;
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_OFF);
+  SetMagnifierEnabled(false);
   EXPECT_TRUE(observed_);
-  EXPECT_EQ(observed_type_, ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+
+  // Disables magnifier again and confirms observer is not invoked.
+  observed_ = false;
+  SetMagnifierEnabled(false);
+  EXPECT_FALSE(observed_);
 
   // Enables full screen magnifier and confirms observer is invoked.
   observed_ = false;
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_FULL);
+  SetMagnifierType(ash::MAGNIFIER_FULL);
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(observed_);
+
+  // Enables full screen magnifier again and confirms observer is invoked.
+  observed_ = false;
+  SetMagnifierEnabled(true);
+  EXPECT_TRUE(observed_);
+  EXPECT_TRUE(observed_enabled_);
+  EXPECT_EQ(ash::MAGNIFIER_FULL, observed_type_);
+
+  // Switches to partial screen magnifier and confirms observer is invoked.
+  observed_ = false;
+  SetMagnifierType(ash::MAGNIFIER_PARTIAL);
+  EXPECT_TRUE(observed_);
+  EXPECT_TRUE(observed_enabled_);
+  EXPECT_EQ(ash::MAGNIFIER_PARTIAL, observed_type_);
+
+  // Switches to partial screen magnifier and confirms observer is invoked.
+  observed_ = false;
+  SetMagnifierType(ash::MAGNIFIER_FULL);
   EXPECT_TRUE(observed_);
-  EXPECT_EQ(observed_type_, ash::MAGNIFIER_FULL);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_FULL);
+  EXPECT_TRUE(observed_enabled_);
+  EXPECT_EQ(ash::MAGNIFIER_FULL, observed_type_);
 
   // Disables magnifier again and confirms observer is invoked.
   observed_ = false;
-  SetScreenManagnifierTypeToPref(ash::MAGNIFIER_OFF);
+  SetMagnifierEnabled(false);
   EXPECT_TRUE(observed_);
-  EXPECT_EQ(observed_type_, ash::MAGNIFIER_OFF);
-  CheckCurrentMagnifierType(ash::MAGNIFIER_OFF);
+  EXPECT_FALSE(observed_enabled_);
+  EXPECT_FALSE(IsMagnifierEnabled());
 }
 
 }  // namespace chromeos