diff --git a/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageMapperTest.java b/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageMapperTest.java
new file mode 100644
index 0000000..2e6f67b
--- /dev/null
+++ b/webmagic-extension/src/test/java/us/codecraft/webmagic/model/PageMapperTest.java
@@ -0,0 +1,46 @@
+package us.codecraft.webmagic.model;
+
+import org.apache.commons.io.IOUtils;
+import org.junit.Test;
+import us.codecraft.webmagic.Page;
+import us.codecraft.webmagic.Request;
+import us.codecraft.webmagic.model.annotation.ExtractBy;
+import us.codecraft.webmagic.selector.PlainText;
+
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author code4crafter@gmail.com
+ *         Date: 2017/6/3
+ *         Time: 下午3:23
+ */
+public class PageMapperTest {
+
+    public static class GithubRepo {
+
+        @ExtractBy(type = ExtractBy.Type.JsonPath, value = "$.name")
+        private String name;
+
+        public String getName() {
+            return name;
+        }
+    }
+
+    @Test
+    public void test_get() throws Exception {
+        PageMapper<GithubRepo> pageMapper = new PageMapper<GithubRepo>(GithubRepo.class);
+        GithubRepo githubRepo = pageMapper.get(getMockJsonPage());
+        assertThat(githubRepo.getName()).isEqualTo("webmagic");
+    }
+
+    private Page getMockJsonPage() throws IOException {
+        Page page = new Page();
+        page.setRawText(IOUtils.toString(getClass().getClassLoader().getResourceAsStream("json/mock-githubrepo.json")));
+        page.setRequest(new Request("https://api.github.com/repos/code4craft/webmagic"));
+        page.setUrl(new PlainText("https://api.github.com/repos/code4craft/webmagic"));
+        return page;
+    }
+    
+}
diff --git a/webmagic-extension/src/test/resources/json/mock-githubrepo.json b/webmagic-extension/src/test/resources/json/mock-githubrepo.json
new file mode 100644
index 0000000..a5037d3
--- /dev/null
+++ b/webmagic-extension/src/test/resources/json/mock-githubrepo.json
@@ -0,0 +1,91 @@
+{
+  "id": 9623064,
+  "name": "webmagic",
+  "full_name": "code4craft/webmagic",
+  "owner": {
+    "login": "code4craft",
+    "id": 1351884,
+    "avatar_url": "https://avatars0.githubusercontent.com/u/1351884?v=3",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/code4craft",
+    "html_url": "https://github.com/code4craft",
+    "followers_url": "https://api.github.com/users/code4craft/followers",
+    "following_url": "https://api.github.com/users/code4craft/following{/other_user}",
+    "gists_url": "https://api.github.com/users/code4craft/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/code4craft/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/code4craft/subscriptions",
+    "organizations_url": "https://api.github.com/users/code4craft/orgs",
+    "repos_url": "https://api.github.com/users/code4craft/repos",
+    "events_url": "https://api.github.com/users/code4craft/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/code4craft/received_events",
+    "type": "User",
+    "site_admin": false
+  },
+  "private": false,
+  "html_url": "https://github.com/code4craft/webmagic",
+  "description": "A scalable web crawler framework for Java.",
+  "fork": false,
+  "url": "https://api.github.com/repos/code4craft/webmagic",
+  "forks_url": "https://api.github.com/repos/code4craft/webmagic/forks",
+  "keys_url": "https://api.github.com/repos/code4craft/webmagic/keys{/key_id}",
+  "collaborators_url": "https://api.github.com/repos/code4craft/webmagic/collaborators{/collaborator}",
+  "teams_url": "https://api.github.com/repos/code4craft/webmagic/teams",
+  "hooks_url": "https://api.github.com/repos/code4craft/webmagic/hooks",
+  "issue_events_url": "https://api.github.com/repos/code4craft/webmagic/issues/events{/number}",
+  "events_url": "https://api.github.com/repos/code4craft/webmagic/events",
+  "assignees_url": "https://api.github.com/repos/code4craft/webmagic/assignees{/user}",
+  "branches_url": "https://api.github.com/repos/code4craft/webmagic/branches{/branch}",
+  "tags_url": "https://api.github.com/repos/code4craft/webmagic/tags",
+  "blobs_url": "https://api.github.com/repos/code4craft/webmagic/git/blobs{/sha}",
+  "git_tags_url": "https://api.github.com/repos/code4craft/webmagic/git/tags{/sha}",
+  "git_refs_url": "https://api.github.com/repos/code4craft/webmagic/git/refs{/sha}",
+  "trees_url": "https://api.github.com/repos/code4craft/webmagic/git/trees{/sha}",
+  "statuses_url": "https://api.github.com/repos/code4craft/webmagic/statuses/{sha}",
+  "languages_url": "https://api.github.com/repos/code4craft/webmagic/languages",
+  "stargazers_url": "https://api.github.com/repos/code4craft/webmagic/stargazers",
+  "contributors_url": "https://api.github.com/repos/code4craft/webmagic/contributors",
+  "subscribers_url": "https://api.github.com/repos/code4craft/webmagic/subscribers",
+  "subscription_url": "https://api.github.com/repos/code4craft/webmagic/subscription",
+  "commits_url": "https://api.github.com/repos/code4craft/webmagic/commits{/sha}",
+  "git_commits_url": "https://api.github.com/repos/code4craft/webmagic/git/commits{/sha}",
+  "comments_url": "https://api.github.com/repos/code4craft/webmagic/comments{/number}",
+  "issue_comment_url": "https://api.github.com/repos/code4craft/webmagic/issues/comments{/number}",
+  "contents_url": "https://api.github.com/repos/code4craft/webmagic/contents/{+path}",
+  "compare_url": "https://api.github.com/repos/code4craft/webmagic/compare/{base}...{head}",
+  "merges_url": "https://api.github.com/repos/code4craft/webmagic/merges",
+  "archive_url": "https://api.github.com/repos/code4craft/webmagic/{archive_format}{/ref}",
+  "downloads_url": "https://api.github.com/repos/code4craft/webmagic/downloads",
+  "issues_url": "https://api.github.com/repos/code4craft/webmagic/issues{/number}",
+  "pulls_url": "https://api.github.com/repos/code4craft/webmagic/pulls{/number}",
+  "milestones_url": "https://api.github.com/repos/code4craft/webmagic/milestones{/number}",
+  "notifications_url": "https://api.github.com/repos/code4craft/webmagic/notifications{?since,all,participating}",
+  "labels_url": "https://api.github.com/repos/code4craft/webmagic/labels{/name}",
+  "releases_url": "https://api.github.com/repos/code4craft/webmagic/releases{/id}",
+  "deployments_url": "https://api.github.com/repos/code4craft/webmagic/deployments",
+  "created_at": "2013-04-23T12:57:36Z",
+  "updated_at": "2017-06-03T03:58:13Z",
+  "pushed_at": "2017-06-03T07:10:15Z",
+  "git_url": "git://github.com/code4craft/webmagic.git",
+  "ssh_url": "git@github.com:code4craft/webmagic.git",
+  "clone_url": "https://github.com/code4craft/webmagic.git",
+  "svn_url": "https://github.com/code4craft/webmagic",
+  "homepage": "http://webmagic.io/",
+  "size": 16982,
+  "stargazers_count": 4566,
+  "watchers_count": 4566,
+  "language": "Java",
+  "has_issues": true,
+  "has_projects": true,
+  "has_downloads": true,
+  "has_wiki": true,
+  "has_pages": true,
+  "forks_count": 2432,
+  "mirror_url": null,
+  "open_issues_count": 96,
+  "forks": 2432,
+  "open_issues": 96,
+  "watchers": 4566,
+  "default_branch": "master",
+  "network_count": 2432,
+  "subscribers_count": 618
+}