[#29] Fix call in WicketJsUtils and provide test cases

src/main/java/org/rauschig/wicketjs/util/WicketJsUtils.java

@@ -50,7 +50,7 @@ public static void append(AjaxRequestTarget target, IJavaScript js) {
      * @see AjaxRequestTarget#prependJavaScript(CharSequence)
      */
     public static void prepend(AjaxRequestTarget target, IJavaScript js) {
-        target.appendJavaScript(toString(js));
+        target.prependJavaScript(toString(js));
     }
 
     /**

src/test/java/org/rauschig/wicketjs/util/WicketJsUtilsTest.java

@@ -0,0 +1,108 @@
+/**
+ *    Copyright 2014 Thomas Rausch
+ *
+ *    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 org.rauschig.wicketjs.util;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.CoreMatchers.startsWith;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+import org.apache.wicket.ajax.AjaxRequestTarget;
+import org.apache.wicket.markup.head.JavaScriptContentHeaderItem;
+import org.apache.wicket.markup.head.JavaScriptHeaderItem;
+import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
+import org.apache.wicket.markup.html.WebPage;
+import org.apache.wicket.mock.MockWebResponse;
+import org.apache.wicket.util.tester.DummyHomePage;
+import org.junit.Test;
+import org.rauschig.wicketjs.AbstractWicketTest;
+import org.rauschig.wicketjs.JsCall;
+import org.rauschig.wicketjs.ajax.JsAjaxEventBehavior;
+
+public class WicketJsUtilsTest extends AbstractWicketTest {
+
+    @Test
+    public void appendPrepend_rendersJsInCorrectOrder() throws Exception {
+        WebPage page = new DummyHomePage();
+        page.add(new JsAjaxEventBehavior("test") {
+            @Override
+            protected void onEvent(AjaxRequestTarget target) {
+                WicketJsUtils.append(target, new JsCall("alert", "pwnd-2"));
+                WicketJsUtils.prepend(target, new JsCall("alert", "pwnd-1"));
+                WicketJsUtils.append(target, new JsCall("alert", "pwnd-3"));
+            }
+        });
+
+        getTester().executeAjaxEvent(page, "test");
+
+        String response = getTester().getLastResponseAsString();
+
+        assertThat(response, containsString("alert('pwnd-1')"));
+        assertThat(response, containsString("alert('pwnd-2')"));
+        assertThat(response, containsString("alert('pwnd-3')"));
+
+        int a = response.indexOf("alert('pwnd-1')");
+        int b = response.indexOf("alert('pwnd-2')");
+        int c = response.indexOf("alert('pwnd-3')");
+
+        assertTrue("Javascript was not appended in the correct order", b > a);
+        assertTrue("Javascript was not appended in the correct order", c > b);
+    }
+
+    @Test
+    public void asOnDomReadyHeaderItem_rendersItemCorrectly() throws Exception {
+        OnDomReadyHeaderItem item = WicketJsUtils.asOnDomReadyHeaderItem(new JsCall("alert", "pwnd"));
+        assertEquals("alert('pwnd')", item.getJavaScript());
+    }
+
+    @Test
+    public void asHeaderItem_withoutCondition_rendersItemCorrectly() throws Exception {
+        JavaScriptHeaderItem item = WicketJsUtils.asHeaderItem(new JsCall("alert", "pwnd"), "js-is-useful");
+
+        assertTrue(item instanceof JavaScriptContentHeaderItem);
+        assertNull(item.getCondition());
+
+        MockWebResponse response = new MockWebResponse();
+        item.render(response);
+
+        String document = response.getTextResponse().toString();
+        assertThat(document, startsWith("<script"));
+        assertThat(document, containsString("type=\"text/javascript\""));
+        assertThat(document, containsString("id=\"js-is-useful\""));
+        assertThat(document, containsString("alert('pwnd')"));
+    }
+
+    @Test
+    public void asHeaderItem_withCondition_rendersItemCorrectly() throws Exception {
+        JavaScriptHeaderItem item = WicketJsUtils.asHeaderItem(new JsCall("alert", "pwnd"), "js-is-useful", "IE");
+
+        assertTrue(item instanceof JavaScriptContentHeaderItem);
+        assertNotNull(item.getCondition());
+
+        MockWebResponse response = new MockWebResponse();
+        item.render(response);
+
+        String document = response.getTextResponse().toString();
+        assertThat(document, startsWith("<!--[if IE]>"));
+        assertThat(document, containsString("<script"));
+        assertThat(document, containsString("type=\"text/javascript\""));
+        assertThat(document, containsString("id=\"js-is-useful\""));
+        assertThat(document, containsString("alert('pwnd')"));
+    }
+}