Added support for writing contracts in Java

fixes gh-1161

samples/standalone/dsl/http-server/src/main/java/com/example/fraud/TestController.java

@@ -24,6 +24,7 @@ import java.nio.file.Files;
 import java.util.Arrays;
 
 import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -60,6 +61,10 @@ public class TestController {
 		return new Test("ok");
 	}
 
+	@GetMapping("/example")
+	public void example() {
+	}
+
 	@PutMapping(value = "/1", consumes = MediaType.APPLICATION_OCTET_STREAM_VALUE, produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
 	public byte[] response(@RequestBody byte[] requestBody) {
 		if (!Arrays.equals(this.request, requestBody)) {

samples/standalone/dsl/http-server/src/test/java/com/example/fraud/TestBase.java

@@ -0,0 +1,29 @@
+/*
+ * 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.fraud;
+
+import io.restassured.module.mockmvc.RestAssuredMockMvc;
+import org.junit.Before;
+
+public class TestBase {
+
+	@Before
+	public void setUp() throws Exception {
+		RestAssuredMockMvc.standaloneSetup(new TestController());
+	}
+
+}

samples/standalone/dsl/http-server/src/test/resources/contracts/test/MyHttpContract.java

@@ -0,0 +1,36 @@
+/*
+ * 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 test;
+
+import java.util.function.Supplier;
+
+import org.springframework.cloud.contract.spec.Contract;
+
+class MyHttpContract implements Supplier<Contract> {
+	@Override
+	public Contract get() {
+		return Contract.make(c -> {
+			c.request(r -> {
+				r.method(r.GET());
+				r.url("/example");
+			});
+			c.response(r -> {
+				r.status(r.OK());
+			});
+		});
+	}
+}