Test actual transformations

3 files changed, 15 insertions, 2 deletions

diff --git a/test/fixtures/files/racecar-100x100-monochrome.jpg b/test/fixtures/files/racecar-100x100-monochrome.jpg
new file mode 100644
index 0000000000..39e683747e
--- /dev/null
+++ b/test/fixtures/files/racecar-100x100-monochrome.jpg
diff --git a/test/fixtures/files/racecar-100x100.jpg b/test/fixtures/files/racecar-100x100.jpg
new file mode 100644
index 0000000000..2a515a4912
--- /dev/null
+++ b/test/fixtures/files/racecar-100x100.jpg
diff --git a/test/variant_test.rb b/test/variant_test.rb
index 0368960fbf..e41842a80c 100644
--- a/test/variant_test.rb
+++ b/test/variant_test.rb
@@ -8,10 +8,23 @@ class ActiveStorage::VariantTest < ActiveSupport::TestCase
   end
 
   test "resized variation" do
-    assert_match /racecar.jpg/, @blob.variant(resize: "100x100").processed.url
+    variant = @blob.variant(resize: "100x100").processed
+
+    assert_match /racecar.jpg/, variant.url    
+    assert_same_image "racecar-100x100.jpg", variant    
   end
 
   test "resized and monochrome variation" do
-    assert_match /racecar.jpg/, @blob.variant(resize: "100x100", monochrome: true).processed.url
+    variant = @blob.variant(resize: "100x100", monochrome: true).processed
+
+    assert_match /racecar.jpg/, variant.url
+    assert_same_image "racecar-100x100-monochrome.jpg", variant    
   end
+
+  private
+    def assert_same_image(fixture_filename, variant)
+      assert_equal \
+        File.binread(File.expand_path("../fixtures/files/#{fixture_filename}", __FILE__)),
+        File.binread(variant.service.send(:path_for, variant.key))
+    end
 end