Check meta-class of method objects in equals (#4918)

yui-knk · kares · commit f8fb28de562d · 2018-01-01T12:59:15.000+01:00
In MRI, `method_eq` checks CLASS_OF method objects

```
(CLASS_OF(method) != CLASS_OF(other))
```

By this change, `TestMethod#test_eq` will be passed.
diff --git a/core/src/main/java/org/jruby/RubyMethod.java b/core/src/main/java/org/jruby/RubyMethod.java
@@ -162,6 +162,10 @@ public boolean equals(Object other) {
         if (method instanceof ProcMethod) {
             return ((ProcMethod) method).isSame(((RubyMethod) other).getMethod());
         }
+        if (getMetaClass() != ((RubyBasicObject) other).getMetaClass()) {
+            return false;
+        }
+
         RubyMethod otherMethod = (RubyMethod)other;
         return receiver == otherMethod.receiver && originModule == otherMethod.originModule &&
             ( isSerialMatch(otherMethod.method) || isMethodMissingMatch(otherMethod.getMethod().getRealMethod()) );
diff --git a/test/mri/excludes/TestMethod.rb b/test/mri/excludes/TestMethod.rb
@@ -4,7 +4,6 @@
 exclude :test_clone, "needs investigation"
 exclude :test_define_method_visibility, "needs investigation"
 exclude :test_define_method_with_symbol, "scope changes in define_method methods?"
-exclude :test_eq, "weird logic for != when patching an object retuned from o.method, likely irrelevant"
 exclude :test_gced_bmethod, "often 'Timeout::Error: execution of assert_normal_exit expired' on CI"
 exclude :test_inspect, "fails since an alias-ed method does not distinguish owner and implementor module"
 exclude :test_hash, "won't pass since Array#map is not a Array#collect alias as in MRI"
