test: extract shared examples for "a paginated response"

spec/features/get_pacticipants_spec.rb

@@ -25,21 +25,11 @@
     context "with pagination options" do
       subject { get(path, { "pageSize" => "2", "pageNumber" => "1" }) }
 
-      it "paginates the response" do
+      it "only returns the number of items specified in the pageSize" do
         expect(response_body_hash[:_links][:"pacticipants"].size).to eq 2
       end
 
-      it "includes the pagination relations" do
-        expect(response_body_hash[:_links]).to have_key(:next)
-      end
-
-      it "includes the page section" do
-        expect(response_body_hash).to have_key(:page)
-      end
-
-      it "outputs a whole number for total pages" do
-        expect(response_body_hash[:page][:totalPages]).to eq(2)
-      end
+      it_behaves_like "a paginated response"
     end
   end
 end

spec/support/shared_examples_for_responses.rb

@@ -9,6 +9,25 @@
 
 end
 
+shared_examples_for "a paginated response" do
+  let(:response_body_hash) { JSON.parse(subject.body, symbolize_names: true) }
+
+  it "includes the pagination relations" do
+    expect(response_body_hash[:_links]).to have_key(:next)
+  end
+
+  it "includes the page details" do
+    expect(response_body_hash).to include(
+      page: {
+        number: instance_of(Integer),
+        size: instance_of(Integer),
+        totalElements: instance_of(Integer),
+        totalPages: instance_of(Integer),
+      }
+    )
+  end
+end
+
 require "rspec/expectations"
 
 RSpec::Matchers.define :be_a_hal_json_success_response do