From ae8bb5fd16cec8e583fd4d561bd9779b8fb5628a Mon Sep 17 00:00:00 2001
From: Callum Styan <callumstyan@gmail.com>
Date: Wed, 6 Dec 2017 15:58:52 -0800
Subject: [PATCH] add Nil and NotNil to test utils

---
 util_test.go | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/util_test.go b/util_test.go
index 69af7e9e3..56d870f69 100644
--- a/util_test.go
+++ b/util_test.go
@@ -65,3 +65,65 @@ func Equals(tb testing.TB, exp, act interface{}) {
 		tb.FailNow()
 	}
 }
+
+// from stretchr/testify
+
+// Copyright (c) 2012 - 2013 Mat Ryer and Tyler Bunnell
+
+// Please consider promoting this project if you find it useful.
+
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without restriction,
+// including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software,
+// and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
+// OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+// isNil checks if a specified object is nil or not, without Failing.
+func isNil(object interface{}) bool {
+	if object == nil {
+		return true
+	}
+
+	value := reflect.ValueOf(object)
+	kind := value.Kind()
+	if kind >= reflect.Chan && kind <= reflect.Slice && value.IsNil() {
+		return true
+	}
+
+	return false
+}
+
+// modified from stretchr/testify
+// Nil asserts that the specified object is nil.
+//
+//    assert.Nil(t, err)
+//
+// Returns whether the assertion was successful (true) or not (false).
+func Nil(tb testing.TB, object interface{}, msg string) {
+	if !isNil(object) {
+		_, file, line, _ := runtime.Caller(1)
+		fmt.Printf("\033[31m%s:%d:\n\n\texp: %#v to be nil\n\n\tmsg: %#v\033[39m\n\n", filepath.Base(file), line, object, msg)
+		tb.FailNow()
+	}
+}
+
+func NotNil(tb testing.TB, object interface{}, msg string) {
+	if isNil(object) {
+		_, file, line, _ := runtime.Caller(1)
+		fmt.Printf("\033[31m%s:%d:\n\n\texp: %#v to not be nil\n\n\tmsg: %#v\033[39m\n\n", filepath.Base(file), line, object, msg)
+		tb.FailNow()
+	}
+}