test: improve update matrix spec

spec/features/update_matrix_spec.rb

@@ -28,7 +28,6 @@
 
   before do
     td.create_pact_with_hierarchy("Foo", "1", "Bar")
-      .create_consumer_version_tag("prod")
       .create_verification(provider_version: "2")
   end
 
@@ -38,6 +37,10 @@
     it "deletes the relevant lines from the matrix" do
       expect{ subject }.to change{ PactBroker::Matrix::Row.count }.by(-1)
     end
+
+    it "deletes the relevant lines from the head matrix" do
+      expect{ subject }.to change{ PactBroker::Matrix::HeadRow.count }.by(-1)
+    end
   end
 
   context "deleting a pacticipant" do
@@ -46,6 +49,10 @@
     it "deletes the relevant lines from the matrix" do
       expect{ subject }.to change{ PactBroker::Matrix::Row.count }.by(-1)
     end
+
+    it "deletes the relevant lines from the head matrix" do
+      expect{ subject }.to change{ PactBroker::Matrix::HeadRow.count }.by(-1)
+    end
   end
 
   context "deleting a version" do
@@ -54,12 +61,24 @@
     it "deletes the relevant lines from the matrix" do
       expect{ subject }.to change{ PactBroker::Matrix::Row.count }.by(-1)
     end
+
+    it "deletes the relevant lines from the head matrix" do
+      expect{ subject }.to change{ PactBroker::Matrix::HeadRow.count }.by(-1)
+    end
   end
 
   context "deleting a tag" do
+    before do
+      td.create_consumer_version_tag("prod")
+    end
+
     let(:path) { "/pacticipants/Foo/versions/1/tags/prod" }
 
-    it "deletes the relevant lines from the matrix" do
+    it "does not delete any lines from the matrix" do
+      expect{ subject }.to change{ PactBroker::Matrix::Row.count }.by(0)
+    end
+
+    it "deletes the relevant lines from the head matrix" do
       expect{ subject }.to change{ PactBroker::Matrix::HeadRow.count }.by(-1)
     end
   end

spec/fixtures/foo-bar.json

@@ -0,0 +1,22 @@
+{
+  "consumer": {
+    "name": "Foo"
+  },
+  "provider": {
+    "name": "Bar"
+  },
+  "interactions": [
+    {
+      "description" : "a request for something",
+      "providerState": null,
+      "request": {
+        "method": "get",
+        "path" : "/something"
+      },
+      "response": {
+        "status": 200,
+        "body" : "something"
+      }
+    }
+  ]
+}