Generate stubs at runtime (#1152)

* Generate stubs at runtime

without this change the producer side must publish the stubs for the consumer side to use them
with this change the consumer can toggle a switch so that the stubs get generated at runtime. This might of course lead to false positivies but we assume that the users know what they're doing

fixes gh-881

samples/standalone/dsl/http-client/src/test/java/com/example/loan/GoodbyeWorldTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2013-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.loan;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.cloud.contract.stubrunner.spring.AutoConfigureStubRunner;
+import org.springframework.cloud.contract.stubrunner.spring.StubRunnerPort;
+import org.springframework.cloud.contract.stubrunner.spring.StubRunnerProperties;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.client.RestTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+// tag::autoconfigure_stubrunner[]
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = WebEnvironment.NONE)
+@AutoConfigureStubRunner(ids = {
+		"com.example:http-server-dsl"},
+		repositoryRoot = "stubs://classpath://contractsAtRuntime/",
+		stubsMode = StubRunnerProperties.StubsMode.LOCAL,
+		generateStubs = true)
+public class GoodbyeWorldTests {
+
+	// end::autoconfigure_stubrunner[]
+
+	@StubRunnerPort("http-server-dsl")
+	int port;
+
+	@Test
+	public void shouldGenerateStubsAtRuntime() {
+		// when:
+		String response = new RestTemplate().getForObject("http://localhost:" + this.port + "/goodbye", String.class);
+		// then:
+		assertThat(response)
+				.isEqualTo("Goodbye World!");
+	}
+
+}

samples/standalone/dsl/http-client/src/test/resources/contractsAtRuntime/goodbyeWorld.groovy

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2013-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import org.springframework.cloud.contract.spec.Contract
+
+Contract.make {
+	request {
+		url("/goodbye")
+		method(GET())
+	}
+	response {
+		status(OK())
+		body("Goodbye World!")
+	}
+}