context.throw supports Error instances

lib/context.js

@@ -54,9 +54,11 @@ module.exports = {
    *    this.throw('name required', 400)
    *    this.throw(400, 'name required')
    *    this.throw('something exploded')
+   *    this.throw(new Error('invalid'), 400);
+   *    this.throw(400, new Error('invalid'));
    *
-   * @param {String|Number} msg or status
+   * @param {String|Number|Error} err, msg or status
-   * @param {String|Number} msg or status
+   * @param {String|Number|Error} err, msg or status
    * @api public
    */
 
@@ -67,7 +69,7 @@ module.exports = {
       status = tmp;
     }
 
-    var err = new Error(msg);
+    var err = msg instanceof Error ? msg : new Error(msg);
     err.status = status || 500;
     err.expose = true;
     throw err;

test/context/throw.js

@@ -15,6 +15,51 @@ describe('ctx.throw(msg)', function(){
   })
 })
 
+describe('ctx.throw(err)', function(){
+  it('should set .status to 500', function(done){
+    var ctx = context();
+    var err = new Error('test');
+
+    try {
+      ctx.throw(err);
+    } catch (err) {
+      assert(500 == err.status);
+      assert('test' == err.message);
+      done();
+    }
+  })
+})
+
+describe('ctx.throw(err, status)', function(){
+  it('should throw the error and set .status', function(done){
+    var ctx = context();
+    var error = new Error('test');
+
+    try {
+      ctx.throw(error, 422);
+    } catch (err) {
+      assert(422 == err.status);
+      assert('test' == err.message);
+      done();
+    }
+  })
+})
+
+describe('ctx.throw(status, err)', function(){
+  it('should throw the error and set .status', function(done){
+    var ctx = context();
+    var error = new Error('test');
+
+    try {
+      ctx.throw(422, error);
+    } catch (err) {
+      assert(422 == err.status);
+      assert('test' == err.message);
+      done();
+    }
+  })
+})
+
 describe('ctx.throw(msg, status)', function(){
   it('should throw an error', function(done){
     var ctx = context();
@@ -55,4 +100,4 @@ describe('ctx.throw(status)', function(){
       done();
     }
   })
-})
+})