testrunner: fix default environment name (#2870)

Author: aslushnikov

utils/testrunner/Test.js

@@ -101,13 +101,14 @@ class Suite {
   constructor(parentSuite, name, location) {
     this._parentSuite = parentSuite;
     this._name = name;
-    this._fullName = (parentSuite ? parentSuite.fullName() + ' ' + name : name).trim();
+    const fullName = (parentSuite ? parentSuite.fullName() + ' ' + name : name).trim();
+    this._fullName = fullName;
     this._location = location;
     this._skipped = false;
     this._expectation = TestExpectation.Ok;
 
     this._defaultEnvironment = {
-      name() { return this._fullName; },
+      name() { return fullName; },
     };
 
     this._environments = [this._defaultEnvironment];