Initial commit.

src/test/java/org/gitlab4j/api/FakeResponse.java

+package org.gitlab4j.api;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStreamReader;
+import java.util.List;
+
+import javax.ws.rs.core.GenericType;
+import javax.ws.rs.core.Response;
+
+/**
+ * This class can be used as a spy for Mockito to test the individual APIs getXxxxx() methods without the
+ * need to have a GitLab server available.
+ * 
+ * Supports getXxxxx() methods that return a List of items, single items, and Optional items.
+ */
+public abstract class FakeResponse extends Response {
+
+    private List<?> responseList;
+    private ByteArrayInputStream responseInputStream;
+    private Object responseItem;
+    private int perPage = 20;
+
+    public <T> void init(Class<T> type, String itemFilename, String listFilename) throws Exception {
+
+        if (itemFilename != null) {
+            InputStreamReader reader = new InputStreamReader(TestGitLabApiBeans.class.getResourceAsStream(itemFilename));
+            responseItem = JsonUtils.unmarshal(type, reader);
+        } else {
+            responseItem = null;
+        }
+
+        if (listFilename != null) {
+            String listJson = JsonUtils.readResource(listFilename);
+            responseList = (List<?>) JsonUtils.unmarshalList(type, listJson);
+            responseInputStream = new ByteArrayInputStream(listJson.getBytes());
+        } else {
+            responseList = null;
+            responseInputStream = null;
+        }
+    }
+
+    public void setPerPageHeaderValue(int perPage) {
+        this.perPage = perPage;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T readEntity(GenericType<T> entityType) {
+        return ((T) responseList);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T readEntity(Class<T> classType) {
+        return ((T) responseItem);
+    }
+
+    @Override
+    public Object getEntity() {
+        if (responseInputStream == null) {
+            return (null);
+        }
+
+        responseInputStream.reset();
+        return (responseInputStream);
+    }
+
+    @Override
+    public String getHeaderString(String name) {
+        switch (name) {
+        case Constants.PER_PAGE:
+            return (responseList != null ? Integer.toString(perPage) : "0");
+
+        case Constants.TOTAL_PAGES_HEADER:
+            return (responseList != null ? Integer.toString((int)Math.ceil((double)responseList.size() / 20.0)) : "0");
+
+        case Constants.TOTAL_HEADER:
+            return (responseList != null ? Integer.toString(responseList.size()) : "0");
+
+        default:
+            return (null);
+        }
+    }
+
+    @Override
+    public int getStatus() {
+        return (200);
+    }
+}
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