fix: ensure specified value of --pact-specification-version is writte…

…n in pact file

Fixes: pact-foundation#93

lib/pact/mock_service/run.rb

@@ -59,7 +59,7 @@ def service_options
           consumer: options[:consumer],
           provider: options[:provider],
           cors_enabled: options[:cors],
-          pact_specification_version: Pact::SpecificationVersion::NIL_VERSION.to_s,
+          pact_specification_version: options[:pact_specification_version] || Pact::SpecificationVersion::NIL_VERSION.to_s,
           pactfile_write_mode: options[:pact_file_write_mode],
           stub_pactfile_paths: options[:stub_pactfile_paths]
         }

spec/integration/cli_spec.rb

@@ -7,7 +7,7 @@
 
   before :all do
     clear_dirs
-    @pid = start_server 1234
+    @pid = start_server 1234, "--pact-specification-version 3.0.0"
   end
 
   it "starts up and responds with mocked responses" do
@@ -40,9 +40,21 @@
   end
 
   it "writes the pact to the specified directory" do
+    clear_interactions 1234
+    setup_interaction 1234
+    invoke_expected_request 1234
     expect(File.exist?('tmp/pacts/consumer-provider.json')).to be true
   end
 
+  it "sets the pact specification version" do
+    clear_interactions 1234
+    setup_interaction 1234
+    invoke_expected_request 1234
+
+    write_pact 1234
+    expect(File.read("tmp/pacts/consumer-provider.json")).to include "3.0.0"
+  end
+
   after :all do
     kill_server @pid
   end

spec/support/integration_spec_support.rb

@@ -116,6 +116,10 @@ def setup_interaction port, interaction = expected_interaction
         mock_service_headers
     end
 
+    def clear_interactions port
+      Faraday.delete "http://localhost:#{port}/interactions"
+    end
+
     def setup_another_interaction port
       Faraday.post "http://localhost:#{port}/interactions",
         another_expected_interaction,