spec/unit/pixel_spec.rb in chunky_png-0.0.3 vs spec/unit/pixel_spec.rb in chunky_png-0.0.4

@@ -26,7 +26,22 @@
   
   it "should convert the individual color values back correctly" do
     @opaque.to_truecolor_bytes.should == [10, 100, 150]
     @non_opaque.to_truecolor_alpha_bytes.should == [10, 100, 150, 100]
   end
+  
+  describe '#compose' do
+    it "should use the foregorund pixel as is when an opaque pixel is given" do
+      (@white & @opaque).should == @opaque
+    end
+    
+    it "should use the background pixel as is when a fully_transparent pixel is given" do
+      (@white & @fully_transparent).should == @white
+    end
+    
+    it "should compose pixels correctly" do
+      (@white.compose_quick(@non_opaque)).should   == ChunkyPNG::Pixel.new(0x9fc2d6ff)
+      (@white.compose_precise(@non_opaque)).should == ChunkyPNG::Pixel.new(0x9fc2d6ff)
+    end
+  end
 end