Create a nicer interface for base::mac::GetValueFromDictionary

base/mac/foundation_util_unittest.mm

Index: base/mac/foundation_util_unittest.mm
diff --git a/base/mac/foundation_util_unittest.mm b/base/mac/foundation_util_unittest.mm
index 9c5daacaea40add4aecb2f626a8fe85db741a9d9..80def8144764c5d835bea46d78054e0db298d572 100644
--- a/base/mac/foundation_util_unittest.mm
+++ b/base/mac/foundation_util_unittest.mm
@@ -275,3 +275,58 @@ TEST(FoundationUtilTest, ObjCCast) {
   EXPECT_FALSE(base::mac::ObjCCastStrict<NSSet>(nil));
   EXPECT_FALSE(base::mac::ObjCCastStrict<NSString>(nil));
 }
+
+TEST(FoundationUtilTest, GetValueFromDictionary) {
+  int one = 1, two = 2, three = 3;
+  CFStringRef keys[3] = {
+    CFSTR("one"), CFSTR("two"), CFSTR("three")
+  };
+  CFNumberRef values[3] = {
+    CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &one),
+    CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &two),
+    CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &three)
+  };
+
+  base::mac::ScopedCFTypeRef<CFDictionaryRef> test_dict(
+      CFDictionaryCreate(kCFAllocatorDefault,
+                         (const void**)keys, (const void**)values, 3,
+                         &kCFCopyStringDictionaryKeyCallBacks,
+                         &kCFTypeDictionaryValueCallBacks));
+
+  // base::mac::GetValueFromDictionary<>(_, _) should produce the correct
+  // expected output.
+  EXPECT_EQ(values[0],
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("one")));
+  EXPECT_EQ(values[1],
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("two")));
+  EXPECT_EQ(values[2],
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("three")));
+
+  // Bad input should produce bad output.
+  EXPECT_FALSE(base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("four")));
+  EXPECT_FALSE(base::mac::GetValueFromDictionary<CFStringRef>(test_dict,
+                                                           CFSTR("one")));
+
+  // base::mac::GetValueFromDictionary<>(_, _) should have the same
+  // response as base::mac::GetValueFromDictionary(_, _, _) does.
+  EXPECT_EQ(base::mac::GetValueFromDictionary(test_dict, CFSTR("one"),
+                                              CFNumberGetTypeID()),
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("one")));
+  EXPECT_EQ(base::mac::GetValueFromDictionary(test_dict, CFSTR("two"),
+                                              CFNumberGetTypeID()),
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("two")));
+  EXPECT_EQ(base::mac::GetValueFromDictionary(test_dict, CFSTR("three"),
+                                              CFNumberGetTypeID()),
+            base::mac::GetValueFromDictionary<CFNumberRef>(test_dict,
+                                                           CFSTR("three")));
+  EXPECT_EQ(base::mac::GetValueFromDictionary(test_dict, CFSTR("one"),
+                                              CFStringGetTypeID()),
+            base::mac::GetValueFromDictionary<CFStringRef>(test_dict,
+                                                           CFSTR("one")));
+}