2 files changed, 31 insertions, 0 deletions
diff --git a/spec/support/include_strings.rb b/spec/support/include_strings.rb
new file mode 100644
index 0000000..bddff1a
--- /dev/null
+++ b/spec/support/include_strings.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+require 'rspec/expectations'
+
+RSpec::Matchers.define :include_strings do |expected|
+  match do |actual|
+    includes_strings = true
+    expected.each do |s|
+      includes_strings = false unless actual.include?(s)
+    end
+    includes_strings
+  end
+end
diff --git a/spec/support/shared_examples/requests/post_request.rb b/spec/support/shared_examples/requests/post_request.rb
new file mode 100644
index 0000000..6ea2a86
--- /dev/null
+++ b/spec/support/shared_examples/requests/post_request.rb
@@ -0,0 +1,19 @@
+RSpec.shared_examples 'a POST request' do
+  let(:headers) { { 'CONTENT_TYPE' => 'application/json' } }
+
+  context 'with correct parameters' do
+    it 'returns a successful http status and a response to the posted data' do
+      post(route, params: params.to_json, headers:)
+      expect(response).to have_http_status(200)
+      expect(response.body).to include_strings(expected_text)
+    end
+  end
+
+  context 'with incorrect parameters' do
+    it 'returns a client side error http status and a error message' do
+      post('/api/authenticate', params: wrong_params.to_json, headers:)
+      expect(response).to have_http_status(desired_error_status)
+      expect(response.body).to include(expected_error_message)
+    end
+  end
+end