better error reporting. add test

index.js

@@ -143,14 +143,23 @@ function createServer(options) {
             user: client.username,
             serverId: digest
           });
-          request.end(function (err,resp){
+          request.end(function(err, resp) {
+            var myErr;
             if (err) {
-              client.end('Error :', err);
+              server.emit('error', err);
-              return;
+              client.end('InternalError');
-            }
+            } else if (resp.serverError) {
-            if (resp.text !== "YES") {
+              myErr = new Error("session.minecraft.net is broken: " + resp.status);
+              myErr.code = 'EMCSESSION500';
+              server.emit('error', myErr);
+              client.end('McSessionDown');
+            } else if (resp.serverError) {
+              myErr = new Error("session.minecraft.net rejected request: " + resp.status);
+              myErr.code = 'EMCSESSION400';
+              server.emit('error', myErr);
+              client.end('McSessionRejectedAuthRequest');
+            } else if (resp.text !== "YES") {
               client.end('FailedToVerifyUsername');
-              return;
             }
           });
         }

test/test.js

@@ -525,6 +525,37 @@ describe("mc-server", function() {
       }
     }
   });
+  it("kicks clients when invalid credentials", function(done) {
+    var server = mc.createServer();
+    var count = 5;
+    server.on('connection', function(client) {
+      client.on('end', function(reason) {
+        resolve();
+        server.close();
+      });
+    });
+    server.on('close', function() {
+      resolve();
+    });
+    server.on('listening', function() {
+      resolve();
+      var client = mc.createClient({
+        username: 'lalalal',
+        password: "this is wrong",
+      });
+      client.on('error', function(err) {
+        assert.strictEqual(err.code, 'ELOGIN400');
+        resolve();
+      });
+      client.on('end', function() {
+        resolve();
+      });
+    });
+    function resolve() {
+      count -= 1;
+      if (count <= 0) done();
+    }
+  });
   it("gives correct reason for kicking clients when shutting down", function(done) {
     var server = mc.createServer({ 'online-mode': false, });
     var count = 2;