add some test for github repo downloader

pom.xml

@@ -136,7 +136,7 @@
             <dependency>
                 <groupId>org.jsoup</groupId>
                 <artifactId>jsoup</artifactId>
-                <version>1.7.2</version>
+                <version>1.8.3</version>
             </dependency>
             <dependency>
                 <groupId>org.mockito</groupId>

webmagic-core/src/test/java/us/codecraft/webmagic/downloader/MockGithubDownloader.java

+package us.codecraft.webmagic.downloader;
+
+import org.apache.commons.io.IOUtils;
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Request;
+import us.codecraft.webmagic.Task;
+import us.codecraft.webmagic.selector.PlainText;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * @author code4crafter@gmail.com
+ */
+public class MockGithubDownloader implements Downloader {
+
+    @Override
+    public Page download(Request request, Task task) {
+        Page page = new Page();
+        InputStream resourceAsStream = this.getClass().getResourceAsStream("/html/mock-github.html");
+        try {
+            page.setRawText(IOUtils.toString(resourceAsStream));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        page.setRequest(new Request("https://github.com/code4craft/webmagic"));
+        page.setUrl(new PlainText("https://github.com/code4craft/webmagic"));
+        return page;
+    }
+
+    @Override
+    public void setThread(int threadNum) {
+    }
+}

webmagic-core/src/test/java/us/codecraft/webmagic/example/GithubRepoPageProcessorTest.java

+package us.codecraft.webmagic.example;
+
+import org.junit.Test;
+import us.codecraft.webmagic.ResultItems;
+import us.codecraft.webmagic.Spider;
+import us.codecraft.webmagic.Task;
+import us.codecraft.webmagic.downloader.MockGithubDownloader;
+import us.codecraft.webmagic.pipeline.Pipeline;
+import us.codecraft.webmagic.processor.example.GithubRepoPageProcessor;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author code4crafter@gmail.com
+ *         Date: 16/1/19
+ *         Time: 上午7:27
+ */
+public class GithubRepoPageProcessorTest {
+
+    @Test
+    public void test_github() throws Exception {
+        Spider.create(new GithubRepoPageProcessor()).addPipeline(new Pipeline() {
+            @Override
+            public void process(ResultItems resultItems, Task task) {
+                assertThat(((String) resultItems.get("name")).trim()).isEqualTo("webmagic");
+                assertThat(((String) resultItems.get("author")).trim()).isEqualTo("code4craft");
+            }
+        }).setDownloader(new MockGithubDownloader()).test("https://github.com/code4craft/webmagic");
+    }
+}