test: test can-i-merge exits with failure if one app has failing result

spec/integration/can_i_merge_spec.rb

@@ -39,6 +39,17 @@ module CLI
           invoke_can_i_merge
         end
 
+        it "exits with failure if one pacticipant has a failing result" do
+          stub_request(:get, "http://pact-broker/matrix?latest=true&latestby=cvp&mainBranch=true&q%5B%5D%5Bpacticipant%5D=Bar&q%5B%5D%5Bversion%5D=5").
+            with(
+              headers: {
+              'Accept'=>'application/hal+json',
+              }).
+            to_return(status: 200, body: File.read("spec/support/matrix_with_failure.json"), headers: { "Content-Type" => "application/hal+json" })     
+          stub_const("ARGV", %w[--pacticipant Bar --version 5])
+          expect($stdout).to receive(:puts).with(/Computer says no.*(success).*(failure)/m)
+          expect { invoke_can_i_merge }.to raise_error(SystemExit)
+        end
 
         it "ignores pacticipant if --ignore flag is provided" do
           stub_request(:get, "http://pact-broker/matrix?latest=true&latestby=cvp&mainBranch=true&q%5B%5D%5Bpacticipant%5D=Bar&q%5B%5D%5Bversion%5D=5&ignore%5B%5D%5Bpacticipant%5D=Foo").

spec/support/matrix_with_failure.json

@@ -0,0 +1,61 @@
+{
+  "summary": {
+    "deployable": false,
+    "ignored": 0,
+    "unknown": 0
+  },
+  "matrix": [
+    {
+      "consumer": {
+        "name": "Baz",
+        "version": {
+          "number": "4"
+        }
+      },
+      "provider": {
+        "name": "Bar",
+        "version": {
+          "number": "5"
+        }
+      },
+      "verificationResult": {
+        "verifiedAt": "2017-10-10T12:49:04+11:00",
+        "success": true,
+        "_links": {
+          "self": {
+            "href": "http://result"
+          }
+        }
+      },
+      "pact": {
+        "createdAt": "2017-10-10T12:49:04+11:00"
+      }
+    },
+    {
+      "consumer": {
+        "name": "Foo",
+        "version": {
+          "number": "4"
+        }
+      },
+      "provider": {
+        "name": "Bar",
+        "version": {
+          "number": "5"
+        }
+      },
+      "verificationResult": {
+        "verifiedAt": "2017-10-10T12:49:04+11:00",
+        "success": false,
+        "_links": {
+          "self": {
+            "href": "http://result"
+          }
+        }
+      },
+      "pact": {
+        "createdAt": "2017-10-10T12:49:04+11:00"
+      }
+    }
+  ]
+}