Disable libvips unfuzzed operations (#226)

and add test coverage for (un)supported file types.

The avatar and logo variants move into the models and return nil for content
types that are no longer variable, so the controllers fall back to the initials
avatar and stock logo icon instead of raising `ActiveStorage::InvariableError`.

test/models/account_test.rb

@@ -15,4 +15,20 @@ class AccountTest < ActiveSupport::TestCase
     accounts(:signal).update!(settings: { "restrict_room_creation_to_administrators" => "false" })
     assert_not accounts(:signal).reload.settings.restrict_room_creation_to_administrators?
   end
+
+  test "logo_variant is a resized variant of a variable logo" do
+    accounts(:signal).logo.attach io: file_fixture("moon.jpg").open, filename: "moon.jpg", content_type: "image/jpeg"
+
+    assert_kind_of ActiveStorage::VariantWithRecord, accounts(:signal).logo_variant(:large)
+  end
+
+  test "logo_variant is nil when the logo cannot be resized" do
+    accounts(:signal).logo.attach io: file_fixture("pixel.bmp").open, filename: "pixel.bmp", content_type: "image/bmp"
+
+    assert_nil accounts(:signal).logo_variant(:large)
+  end
+
+  test "logo_variant is nil without a logo" do
+    assert_nil accounts(:signal).logo_variant(:large)
+  end
 end

test/models/user/avatar_test.rb

@@ -0,0 +1,19 @@
+require "test_helper"
+
+class User::AvatarTest < ActiveSupport::TestCase
+  test "avatar_variant is a resized variant of a variable avatar" do
+    users(:kevin).avatar.attach io: file_fixture("moon.jpg").open, filename: "moon.jpg", content_type: "image/jpeg"
+
+    assert_kind_of ActiveStorage::VariantWithRecord, users(:kevin).avatar_variant
+  end
+
+  test "avatar_variant is nil when the avatar cannot be resized" do
+    users(:kevin).avatar.attach io: file_fixture("pixel.bmp").open, filename: "pixel.bmp", content_type: "image/bmp"
+
+    assert_nil users(:kevin).avatar_variant
+  end
+
+  test "avatar_variant is nil without an avatar" do
+    assert_nil users(:kevin).avatar_variant
+  end
+end