ModelAttribute: Add `.methods_by_class` method

Allows us to get all `ModelAttribute`s given a certain class name.

Needed an `#==` method to be able to test object equality more easily so
I added one in.

I don't like that the `klass` is a lowercase symbol and the `klass`
attribute to `.methods_by_class` is a constantized string. Want to
correct that and make them uniform. Only did it this way because that's
how it was suggested in the ticket.

Refs #4401

1 files changed, 26 insertions, 0 deletions

diff --git a/spec/lib/model_attribute_spec.rb b/spec/lib/model_attribute_spec.rb
index ad1dd863f..73114ae1e 100644
--- a/spec/lib/model_attribute_spec.rb
+++ b/spec/lib/model_attribute_spec.rb
@@ -14,6 +14,23 @@ RSpec.describe ModelAttribute do
     end
   end
 
+  describe ".methods_by_class" do
+    it "returns all ModelAttributes for a given class" do
+      ModelAttribute.instance_variable_set(:@__all__, [
+        ModelAttribute.new(:route, :name, :string),
+        ModelAttribute.new(:route, :published_name, :string),
+        ModelAttribute.new(:route, :direction, :string),
+        ModelAttribute.new(:journey_pattern, :name, :string)
+      ])
+
+      expect(ModelAttribute.methods_by_class('Route')).to match_array([
+        ModelAttribute.new(:route, :name, :string),
+        ModelAttribute.new(:route, :published_name, :string),
+        ModelAttribute.new(:route, :direction, :string)
+      ])
+    end
+  end
+
   describe "#code" do
     it "returns a string representation of the attribute" do
       model_attr = ModelAttribute.new(:route, :name, :string)
@@ -21,4 +38,13 @@ RSpec.describe ModelAttribute do
       expect(model_attr.code).to eq('route#name')
     end
   end
+
+  describe "#==" do
+    it "returns true when :klass, :name, and :data_type attributes match" do
+      route_name = ModelAttribute.new(:route, :name, :string)
+      other_route_name = ModelAttribute.new(:route, :name, :string)
+
+      expect(route_name == other_route_name).to be true
+    end
+  end
 end