Test for overloaded call paths all arities

Missed test case related to jruby#7904

spec/java_integration/fixtures/CoreTypeMethods.java

@@ -335,4 +335,44 @@ public String getTypeInstance(double i, String o, String o2, String o3) {
     public String getTypeInstance(long i, String o, String o2, String o3) {
         return "long,string,string,string";
     }
+
+    public static int manyArityStatic() {
+        return 0;
+    }
+
+    public static int manyArityStatic(String str1) {
+        return 1;
+    }
+
+    public static int manyArityStatic(String str1, String str2) {
+        return 2;
+    }
+
+    public static int manyArityStatic(String str1, String str2, String str3) {
+        return 3;
+    }
+
+    public static int manyArityStatic(String str1, String str2, String str3, String str4) {
+        return 4;
+    }
+
+    public int manyArityInstance() {
+        return 0;
+    }
+
+    public int manyArityInstance(String str1) {
+        return 1;
+    }
+
+    public int manyArityInstance(String str1, String str2) {
+        return 2;
+    }
+
+    public int manyArityInstance(String str1, String str2, String str3) {
+        return 3;
+    }
+
+    public int manyArityInstance(String str1, String str2, String str3, String str4) {
+        return 4;
+    }
 }

spec/java_integration/methods/dispatch_spec.rb

@@ -120,6 +120,21 @@
       CoreTypeMethods.new.getTypeInstance()
     end.to raise_error(ArgumentError)
   end
+
+  it "should be callable with all arities" do
+    expect(CoreTypeMethods.manyArityStatic()).to eq(0)
+    expect(CoreTypeMethods.manyArityStatic("foo")).to eq(1)
+    expect(CoreTypeMethods.manyArityStatic("foo", "foo")).to eq(2)
+    expect(CoreTypeMethods.manyArityStatic("foo", "foo", "foo")).to eq(3)
+    expect(CoreTypeMethods.manyArityStatic("foo", "foo", "foo", "foo")).to eq(4)
+
+    ctm = CoreTypeMethods.new
+    expect(ctm.manyArityInstance()).to eq(0)
+    expect(ctm.manyArityInstance("foo")).to eq(1)
+    expect(ctm.manyArityInstance("foo", "foo")).to eq(2)
+    expect(ctm.manyArityInstance("foo", "foo", "foo")).to eq(3)
+    expect(ctm.manyArityInstance("foo", "foo", "foo", "foo")).to eq(4)
+  end
 end
 
 describe "A class with varargs constructors" do