add tests for string constants in BS files

test/test/spec/const_spec.rb

@@ -16,3 +16,15 @@ describe "Constants starting with a lower-case character" do
     LowerCaseConstant.should == 42
   end
 end
+
+describe "#define foo @\"value\" constants (NSString)" do
+  it "can be retrieved" do
+    TestNSStringConstant.should == 'foo'
+  end
+end
+
+describe "#define foo \"value\" constants (C string)" do
+  it "can be retrieved" do
+    TestStringConstant.should == 'foo'
+  end
+end

test/test/vendor/code/code.h

@@ -58,3 +58,6 @@ static inline int TestInlineFunction(int x, int y, int z) {
 extern int lowerCaseConstant;
 @interface lowerCaseClass : NSObject
 @end
+
+#define TestStringConstant "foo"
+#define TestNSStringConstant @"foo"