spec: Add discussion spec

Test Plan
1. Pass Jenkins

Change-Id: Idac4ee9f19ca639e8d7316d19132a078a944e1ce
Reviewed-on: https://gerrit.instructure.com/156796
Tested-by: Jenkins
Reviewed-by: Robert Lamb <rlamb@instructure.com>
Product-Review: Robert Lamb <rlamb@instructure.com>
QA-Review: Robert Lamb <rlamb@instructure.com>

pact/spec/discussions_spec.rb

@@ -96,5 +96,38 @@ describe 'Discussions', :pact do
     expect(response[0]['id']).to eq 1
     expect(response[0]['title']).to eq 'No Title'
   end
+
+  it 'should Post Discussion' do
+    canvas_lms_api.given('a teacher enrolled in a course').
+      upon_receiving('Post Discussion').
+        with(
+          method: :post,
+          headers: {
+            'Authorization': 'Bearer some_token',
+            'Auth-User': 'Teacher1',
+            'Connection': 'close',
+            'Host': PactConfig.mock_provider_service_base_uri,
+            'Version': 'HTTP/1.1',
+            'Content-Type': 'application/json'
+          },
+          'path' => '/api/v1/courses/1/discussion_topics',
+          'body' =>
+          {
+            'discussion_topic':
+              {
+                'title': 'New Discussion'
+              }
+          },
+        query: ''
+      ).
+      will_respond_with(
+        status: 200,
+        body: Pact.like('id': 1, 'title': 'New Discussion')
+      )
+    discussions_api.authenticate_as_user('Teacher1')
+    response = discussions_api.post_discussion(1, 'New Discussion')
+    expect(response['id']).to eq 1
+    expect(response['title']).to eq 'New Discussion'
+  end
 end
 

pact/spec/helper/api_client/discussions.rb

@@ -31,6 +31,24 @@ module Helper
       rescue
         nil
       end
+
+      def post_discussion(course_id, discussion_name)
+        JSON.parse(
+          self.class.post(
+            "/api/v1/courses/#{course_id}/discussion_topics",
+            :body =>
+              {
+                :discussion_topic =>
+                  {
+                    :title => discussion_name
+                  }
+              }.to_json,
+            :headers => {'Content-Type' => 'application/json'}
+           ).body
+        )
+      rescue
+        nil
+      end
     end
   end
 end