added example matcher test

src/test/groovy/com/stehno/ersatz/issues/BodyContentMatcherSpec.groovy

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2018 Christopher J. Stehno
+ *
+ * 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
+ *
+ *         http://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.stehno.ersatz.issues
+
+import com.stehno.ersatz.DecodingContext
+import com.stehno.ersatz.ErsatzServer
+import com.stehno.ersatz.util.HttpClient
+import okhttp3.MediaType
+import okhttp3.Response
+import spock.lang.AutoCleanup
+import spock.lang.Specification
+
+import javax.xml.parsers.DocumentBuilderFactory
+
+import static com.stehno.ersatz.ContentType.TEXT_XML
+import static com.stehno.ersatz.Decoders.utf8String
+import static com.stehno.ersatz.Encoders.text
+import static okhttp3.RequestBody.create
+import static org.hamcrest.CoreMatchers.equalTo
+import static org.hamcrest.xml.HasXPath.hasXPath
+
+class BodyContentMatcherSpec extends Specification {
+
+    @AutoCleanup private final ErsatzServer server = new ErsatzServer()
+    private final HttpClient http = new HttpClient()
+
+    void 'matching all of body content'() {
+        setup:
+        String requestXml = '<request><node foo="bar"/></request>'
+        String responseXml = '<response>OK</response>'
+
+        server.expectations {
+            post('/posting') {
+                decoder 'text/xml; charset=utf-8', utf8String
+                body requestXml, 'text/xml; charset=utf-8'
+                responder {
+                    body responseXml, TEXT_XML
+                    encoder TEXT_XML, String, text
+                }
+            }
+        }
+
+        when:
+        Response response = http.post(server.httpUrl('/posting'), create(MediaType.get('text/xml; charset=utf-8'), requestXml))
+
+        then:
+        response.body().string() == responseXml
+    }
+
+    void 'matching part of body content'() {
+        setup:
+        String requestXml = '<request><node foo="bar"/></request>'
+        String responseXml = '<response>OK</response>'
+
+        server.expectations {
+            post('/posting') {
+                decoder('text/xml; charset=utf-8') { byte[] bytes, DecodingContext ctx ->
+                    DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new ByteArrayInputStream(bytes))
+                }
+                body hasXPath('string(//request/node/@foo)', equalTo('bar')), 'text/xml; charset=utf-8'
+                called 1
+                responder {
+                    body responseXml, TEXT_XML
+                    encoder TEXT_XML, String, text
+                }
+            }
+        }
+
+        when:
+        Response response = http.post(server.httpUrl('/posting'), create(MediaType.get('text/xml; charset=utf-8'), requestXml))
+
+        then:
+        response.body().string() == responseXml
+
+        when:
+        response = http.post(server.httpUrl('/posting'), create(MediaType.get('text/xml; charset=utf-8'), '<request><node foo="blah"/></request>'))
+
+        then:
+        response.code() == 404
+
+        and:
+        server.verify()
+    }
+}