added StackAPI interface and StackMockAPI alternative

grails-app/services/net/zomis/duga/StackAPI.groovy

@@ -0,0 +1,5 @@
+package net.zomis.duga
+
+interface StackAPI {
+    def apiCall(String apiCall, String site, String filter) throws IOException;
+}

grails-app/services/net/zomis/duga/StackExchangeAPI.groovy

@@ -7,7 +7,7 @@ import java.util.zip.GZIPInputStream;
 
 import org.springframework.beans.factory.annotation.Autowired;
 
-class StackExchangeAPI {
+class StackExchangeAPI implements StackAPI {
 
 	@Autowired
 	private Environment config;
@@ -28,6 +28,7 @@ class StackExchangeAPI {
 					+ "&filter=" + filter + "&key=" + apiKey);
 	}
 
+    @Override
 	def apiCall(String apiCall, String site, String filter) throws IOException {
 		final String apiKey = config.getProperty('stackAPI');
 		URL url = buildURL(apiCall, site, filter, apiKey);

src/integration-test/groovy/net/zomis/duga/tasks/qscan/StackMockAPI.groovy

@@ -0,0 +1,21 @@
+package net.zomis.duga.tasks.qscan
+
+import net.zomis.duga.StackAPI
+
+class StackMockAPI implements StackAPI {
+
+    Map results = [:]
+
+    StackMockAPI expect(String apiCall, def result) {
+        results.put(apiCall, result)
+        this
+    }
+
+    @Override
+    def apiCall(String apiCall, String site, String filter) throws IOException {
+        def result = results.get(apiCall)
+        assert result : "No mock result defined for $apiCall. Keys are ${results.keySet()}"
+        result
+    }
+
+}