Add Welsh About us text for non-ministerial departments

Welsh organisation pages of non-ministerial departments now render
"Adran anweinidogol yw'r X" instead of falling back to English.
Other organisation types continue to render in English until their
sentence templates are confirmed by a translator.

Author: jamiestamp

config/locales/cy.yml

@@ -37,6 +37,10 @@ cy:
       jobs: Swyddi
       jobs_and_contacts: Swyddi a chontractau
       organisation_chart: Ein siart sefydliadol
+    relationship:
+      type_only_html: "%{type_name} yw'r %{name}."
+    type:
+      non_ministerial_department: Adran anweinidogol
   worldwide_organisation:
     corporate_information:
       about_our_services_html: Darganfod %{link}.

test/unit/app/helpers/organisation_helper_test.rb

@@ -177,4 +177,41 @@ def assert_display_name_text(organisation, expected_text)
     description = organisation_display_name_including_parental_and_child_relationships(org)
     assert_equal "TO works with the Department of Testing and is supported by 2 agencies and public bodies.", strip_html_tags(description)
   end
+
+  test "non-ministerial department renders Welsh identification sentence" do
+    org = create(:organisation, acronym: "CC", name: "Comisiwn Elusennau", organisation_type: OrganisationType.non_ministerial_department)
+
+    I18n.with_locale(:cy) do
+      assert_display_name_text org, "Adran anweinidogol yw'r CC."
+    end
+  end
+
+  test "non-ministerial department with parents renders Welsh identification sentence" do
+    parent = create(:ministerial_department, name: "Department of Testing")
+    org = create(:organisation, acronym: "CC", name: "Comisiwn Elusennau", organisation_type: OrganisationType.non_ministerial_department, parent_organisations: [parent])
+
+    I18n.with_locale(:cy) do
+      assert_display_name_text org, "Adran anweinidogol yw'r CC."
+    end
+  end
+
+  test "non-ministerial department with supporting bodies renders mixed Welsh/English sentence in Welsh" do
+    child = create(:organisation, acronym: "CO", name: "Child Organisation One")
+    org = create(:organisation, acronym: "CC", name: "Comisiwn Elusennau", organisation_type: OrganisationType.non_ministerial_department)
+    org.stubs(:supporting_bodies).returns([child])
+
+    I18n.with_locale(:cy) do
+      description = organisation_display_name_including_parental_and_child_relationships(org)
+      assert_equal "Adran anweinidogol yw'r CC, supported by 1 public body.", strip_html_tags(description)
+    end
+  end
+
+  test "non-Welsh-translated type falls back to English in Welsh locale" do
+    parent = create(:ministerial_department, name: "Department of Testing")
+    org = create(:organisation, acronym: "EA", name: "Executive Agency Example", organisation_type: OrganisationType.executive_agency, parent_organisations: [parent])
+
+    I18n.with_locale(:cy) do
+      assert_display_name_text org, "EA is an executive agency, sponsored by the Department of Testing."
+    end
+  end
 end