remove listeners to avoid leaks

lib/tests/test.js

@@ -33,6 +33,7 @@ class Test {
     this.contracts = {};
     this.events = new Events();
     this.ready = true;
+    this.error = false;
     this.builtContracts = {};
     this.compiledContracts = {};
 
@@ -111,13 +112,19 @@ class Test {
   }
 
   onReady(callback) {
+    const self = this;
     if (this.ready) {
       return callback();
     }
+    if (this.error) {
+      return callback(this.error);
+    }
     this.events.once('ready', () => {
+      self.events.removeListener('deployError', () => {});
       callback();
     });
     this.events.once('deployError', (err) => {
+      self.events.removeListener('ready', () => {});
       callback(err);
     });
   }
@@ -180,9 +187,11 @@ class Test {
         self._deploy(options, (err, accounts) => {
           if (err) {
             self.events.emit('deployError', err);
+            self.error = err;
             return next(err);
           }
           self.ready = true;
+          self.error = false;
           self.events.emit('ready');
           next(null, accounts);
         });