Add some tests for plugins validation

test/plugins.js

@@ -0,0 +1,22 @@
+var path = require('path');
+var _ = require('lodash');
+var assert = require('assert');
+var fs = require("fs");
+
+var Plugin = require("../lib/plugin");
+
+var PLUGINS_ROOT = path.resolve(__dirname, "plugins");
+
+describe('Plugins', function () {
+    it('should correctly fail on invalid version', function() {
+        var plugin = new Plugin(books[0], "invalid");
+        plugin.load("./invalid", PLUGINS_ROOT);
+        assert(!plugin.isValid());
+    });
+
+    it('should correctly valid a plugin', function() {
+        var plugin = new Plugin(books[0], "invalid");
+        plugin.load("./empty", PLUGINS_ROOT);
+        assert(plugin.isValid());
+    });
+});

test/plugins/empty/index.js

@@ -0,0 +1 @@
+module.exports = {};

test/plugins/empty/package.json

@@ -0,0 +1,9 @@
+{
+    "name": "gitbook-plugin-empty",
+    "description": "Test empty plugin",
+    "main": "index.js",
+    "version": "0.0.1",
+    "engines": {
+        "gitbook": "*"
+    }
+}

test/plugins/invalid/index.js

@@ -0,0 +1 @@
+module.exports = {};

test/plugins/invalid/package.json

@@ -0,0 +1,9 @@
+{
+    "name": "gitbook-plugin-invalid",
+    "description": "Test invalid plugin",
+    "main": "index.js",
+    "version": "0.0.1",
+    "engines": {
+        "gitbook": "<2.0.0"
+    }
+}