Add tests for the InheritingHash class

Author: meanphil

test/cases/inheriting_hash_test.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+
+class InheritingHashTest < ActiveSupport::TestCase
+  def setup
+    @parent = ActiveResource::InheritingHash.new({ override_me: 'foo', parent_key: 'parent_value'  })
+    @child  = ActiveResource::InheritingHash.new(@parent)
+    @child[:override_me] = 'bar'
+    @child[:child_only] = 'baz'
+  end
+
+  def test_child_key_overrides_parent_key
+    assert_equal 'bar', @child[:override_me]
+  end
+
+  def test_parent_key_available_on_lookup
+    assert_equal 'parent_value', @child[:parent_key]
+  end
+
+  def test_conversion_to_regular_hash_includes_parent_keys
+    hash = @child.to_hash
+
+    assert_equal 3, hash.keys.length
+    assert_equal 'parent_value', hash[:parent_key]
+  end
+end