add test to verify that errors defined with same code and description are not considered equal via the error interface

test/end2end_test.go

@@ -2137,3 +2137,15 @@ func equalErrors(l, r error) bool {
 	}
 	return grpc.Code(l) == grpc.Code(r) && grpc.ErrorDesc(l) == grpc.ErrorDesc(r)
 }
+
+func TestErrorsWithSameParameters(t *testing.T) {
+	const description = "some description"
+	e1 := grpc.Errorf(codes.AlreadyExists, description)
+	e2 := grpc.Errorf(codes.AlreadyExists, description)
+	if e1 == e2 {
+		t.Fatalf("Error interfaces should not be considered equal - e1: %p - %v  e2: %p - %v", e1, e1, e2, e2)
+	}
+	if !equalErrors(e1, e2) {
+		t.Fatalf("Expected errors to have same code and description - e1: %p - %v  e2: %p - %v", e1, e1, e2, e2)
+	}
+}