gh-342: Rest Docs stubs with no body

spring-cloud-contract-wiremock/src/main/java/org/springframework/cloud/contract/wiremock/restdocs/WireMockSnippet.java

@@ -32,6 +32,7 @@ import com.github.tomakehurst.wiremock.http.HttpHeaders;
 import com.github.tomakehurst.wiremock.matching.UrlPattern;
 import com.github.tomakehurst.wiremock.stubbing.StubMapping;
 
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.http.MediaType;
 import org.springframework.restdocs.RestDocumentationContext;
 import org.springframework.restdocs.operation.Operation;
@@ -192,11 +193,13 @@ public class WireMockSnippet implements Snippet {
 				builder.withRequestBody(matchingJsonPath(jsonPath));
 			}
 		}
-		else if (this.hasJsonBodyRequestToMatch) {
-			builder.withRequestBody(equalToJson(content));
-		}
-		else {
-			builder.withRequestBody(equalTo(content));
+		else if (StringUtils.isNotEmpty(content)) {
+			if (this.hasJsonBodyRequestToMatch) {
+				builder.withRequestBody(equalToJson(content));
+			}
+			else {
+				builder.withRequestBody(equalTo(content));
+			}
 		}
 		return builder;
 	}

spring-cloud-contract-wiremock/src/test/java/org/springframework/cloud/contract/wiremock/restdocs/WireMockSnippetTests.java

@@ -112,6 +112,24 @@ public class WireMockSnippetTests {
 				.isEqualTo("{\"name\": \"12\"}");
 	}
 
+	@Test
+	public void should_handle_empty_request_body() throws IOException {
+		given(this.operation.getName()).willReturn("foo");
+		WireMockSnippet snippet = new WireMockSnippet();
+		given(this.operation.getRequest()).willReturn(requestPostWithEmptyBody());
+
+		snippet.document(this.operation);
+
+		File stub = new File(this.outputFolder, "stubs/foo.json");
+		assertThat(stub).exists();
+		StubMapping stubMapping = WireMockStubMapping
+				.buildFrom(new String(Files.readAllBytes(stub.toPath())));
+		assertThat(stubMapping.getRequest().getBodyPatterns()).isNullOrEmpty();
+		assertThat(stubMapping.getResponse().getStatus())
+				.isEqualTo(HttpStatus.ACCEPTED.value());
+
+	}
+
 	private OperationResponse response() {
 		return new OperationResponse() {
 
@@ -219,4 +237,45 @@ public class WireMockSnippetTests {
 			}
 		};
 	}
+
+	private OperationRequest requestPostWithEmptyBody() {
+		return new OperationRequest() {
+			@Override
+			public byte[] getContent() {
+				return new byte[0];
+			}
+
+			@Override
+			public String getContentAsString() {
+				return "";
+			}
+
+			@Override
+			public HttpHeaders getHeaders() {
+				HttpHeaders httpHeaders = new HttpHeaders();
+				httpHeaders.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
+				return httpHeaders;
+			}
+
+			@Override
+			public HttpMethod getMethod() {
+				return HttpMethod.POST;
+			}
+
+			@Override
+			public Parameters getParameters() {
+				return null;
+			}
+
+			@Override
+			public Collection<OperationRequestPart> getParts() {
+				return null;
+			}
+
+			@Override
+			public URI getUri() {
+				return URI.create("http://foo/bar");
+			}
+		};
+	}
 }