1 files changed, 72 insertions, 0 deletions
diff --git a/activestorage/test/models/variant_test.rb b/activestorage/test/models/variant_test.rb
new file mode 100644
index 0000000000..7157bfac3a
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+++ b/activestorage/test/models/variant_test.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+require "test_helper"
+require "database/setup"
+
+class ActiveStorage::VariantTest < ActiveSupport::TestCase
+  test "resized variation of JPEG blob" do
+    blob = create_file_blob(filename: "racecar.jpg")
+    variant = blob.variant(resize: "100x100").processed
+    assert_match(/racecar\.jpg/, variant.service_url)
+
+    image = read_image(variant)
+    assert_equal 100, image.width
+    assert_equal 67, image.height
+  end
+
+  test "resized and monochrome variation of JPEG blob" do
+    blob = create_file_blob(filename: "racecar.jpg")
+    variant = blob.variant(resize: "100x100", monochrome: true).processed
+    assert_match(/racecar\.jpg/, variant.service_url)
+
+    image = read_image(variant)
+    assert_equal 100, image.width
+    assert_equal 67, image.height
+    assert_match(/Gray/, image.colorspace)
+  end
+
+  test "center-weighted crop of JPEG blob" do
+    blob = create_file_blob(filename: "racecar.jpg")
+    variant = blob.variant(combine_options: {
+      gravity: "center",
+      resize: "100x100^",
+      crop: "100x100+0+0",
+    }).processed
+    assert_match(/racecar\.jpg/, variant.service_url)
+
+    image = read_image(variant)
+    assert_equal 100, image.width
+    assert_equal 100, image.height
+  end
+
+  test "resized variation of PSD blob" do
+    blob = create_file_blob(filename: "icon.psd", content_type: "image/vnd.adobe.photoshop")
+    variant = blob.variant(resize: "20x20").processed
+    assert_match(/icon\.png/, variant.service_url)
+
+    image = read_image(variant)
+    assert_equal "PNG", image.type
+    assert_equal 20, image.width
+    assert_equal 20, image.height
+  end
+
+  test "optimized variation of GIF blob" do
+    blob = create_file_blob(filename: "image.gif", content_type: "image/gif")
+
+    assert_nothing_raised do
+      blob.variant(layers: "Optimize").processed
+    end
+  end
+
+  test "variation of invariable blob" do
+    assert_raises ActiveStorage::Blob::InvariableError do
+      create_file_blob(filename: "report.pdf", content_type: "application/pdf").variant(resize: "100x100")
+    end
+  end
+
+  test "service_url doesn't grow in length despite long variant options" do
+    blob = create_file_blob(filename: "racecar.jpg")
+    variant = blob.variant(font: "a" * 10_000).processed
+    assert_operator variant.service_url.length, :<, 500
+  end
+end