Allow createSpyObj to be called with just an array of method names

[Finish #50757607] #321

src/core/base.js

@@ -105,6 +105,11 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
   };
 
   j$.createSpyObj = function(baseName, methodNames) {
+    if (j$.isArray_(baseName) && j$.util.isUndefined(methodNames)) {
+      methodNames = baseName;
+      baseName = 'unknown';
+    }
+
     if (!j$.isArray_(methodNames) || methodNames.length === 0) {
       throw 'createSpyObj requires a non-empty array of method names to create spies for';
     }