Add Zero and NotZero assertions and requirements

Zero returns true if the value equals the value's type's zero value.

NotZero returns the opposite of Zero.

assert/assertions.go

@@ -334,7 +334,7 @@ func Nil(t TestingT, object interface{}, msgAndArgs ...interface{}) bool {
 	return Fail(t, fmt.Sprintf("Expected nil, but got: %#v", object), msgAndArgs...)
 }
 
-var zeros = []interface{}{
+var numericZeros = []interface{}{
 	int(0),
 	int8(0),
 	int16(0),
@@ -360,7 +360,7 @@ func isEmpty(object interface{}) bool {
 		return true
 	}
 
-	for _, v := range zeros {
+	for _, v := range numericZeros {
 		if object == v {
 			return true
 		}
@@ -893,3 +893,19 @@ func NotRegexp(t TestingT, rx interface{}, str interface{}, msgAndArgs ...interf
 	return !match
 
 }
+
+// Zero asserts that i is the zero value for its type and returns the truth.
+func Zero(t TestingT, i interface{}, msgAndArgs ...interface{}) bool {
+	if i != nil && !reflect.DeepEqual(i, reflect.Zero(reflect.TypeOf(i)).Interface()) {
+		return Fail(t, fmt.Sprintf("Should be zero, but was %v", i), msgAndArgs...)
+	}
+	return true
+}
+
+// NotZero asserts that i is not the zero value for its type and returns the truth.
+func NotZero(t TestingT, i interface{}, msgAndArgs ...interface{}) bool {
+	if i == nil || reflect.DeepEqual(i, reflect.Zero(reflect.TypeOf(i)).Interface()) {
+		return Fail(t, fmt.Sprintf("Should not be zero, but was %v", i), msgAndArgs...)
+	}
+	return true
+}

assert/assertions_test.go

@@ -4,11 +4,79 @@ import (
 	"errors"
 	"io"
 	"math"
+	"reflect"
 	"regexp"
 	"testing"
 	"time"
 )
 
+var (
+	i      interface{}
+	zeros = []interface{}{
+		false,
+		byte(0),
+		complex64(0),
+		complex128(0),
+		float32(0),
+		float64(0),
+		int(0),
+		int8(0),
+		int16(0),
+		int32(0),
+		int64(0),
+		rune(0),
+		uint(0),
+		uint8(0),
+		uint16(0),
+		uint32(0),
+		uint64(0),
+		uintptr(0),
+		"",
+		[0]interface{}{},
+		[]interface{}(nil),
+		struct{ x int }{},
+		(*interface{})(nil),
+		(func())(nil),
+		nil,
+		interface{}(nil),
+		map[interface{}]interface{}(nil),
+		(chan interface{})(nil),
+		(<-chan interface{})(nil),
+		(chan<- interface{})(nil),
+	}
+	nonZeros = []interface{}{
+		true,
+		byte(1),
+		complex64(1),
+		complex128(1),
+		float32(1),
+		float64(1),
+		int(1),
+		int8(1),
+		int16(1),
+		int32(1),
+		int64(1),
+		rune(1),
+		uint(1),
+		uint8(1),
+		uint16(1),
+		uint32(1),
+		uint64(1),
+		uintptr(1),
+		"s",
+		[1]interface{}{1},
+		[]interface{}{},
+		struct{ x int }{1},
+		(*interface{})(&i),
+		(func())(func() {}),
+		interface{}(1),
+		map[interface{}]interface{}{},
+		(chan interface{})(make(chan interface{})),
+		(<-chan interface{})(make(chan interface{})),
+		(chan<- interface{})(make(chan interface{})),
+	}
+)
+
 // AssertionTesterInterface defines an interface to be used for testing assertion methods
 type AssertionTesterInterface interface {
 	TestMethod()
@@ -811,3 +879,27 @@ func TestCallerInfoWithAutogeneratedFunctions(t *testing.T) {
 		testAutogeneratedFunction()
 	})
 }
+
+func TestZero(t *testing.T) {
+	mockT := new(testing.T)
+
+	for _, test := range zeros {
+		True(t, Zero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+	}
+
+	for _, test := range nonZeros {
+		False(t, Zero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+	}
+}
+
+func TestNotZero(t *testing.T) {
+	mockT := new(testing.T)
+
+	for _, test := range zeros {
+		False(t, NotZero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+	}
+
+	for _, test := range nonZeros {
+		True(t, NotZero(mockT, test, "%#v is not the %v zero value", test, reflect.TypeOf(test)))
+	}
+}

assert/forward_assertions.go

@@ -263,3 +263,13 @@ func (a *Assertions) Regexp(rx interface{}, str interface{}, msgAndArgs ...inter
 func (a *Assertions) NotRegexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
 	return NotRegexp(a.t, rx, str, msgAndArgs...)
 }
+
+// Zero asserts that i is the zero value for its type and returns the truth.
+func (a *Assertions) Zero(i interface{}, msgAndArgs ...interface{}) bool {
+	return Zero(a.t, i, msgAndArgs...)
+}
+
+// NotZero asserts that i is not the zero value for its type and returns the truth.
+func (a *Assertions) NotZero(i interface{}, msgAndArgs ...interface{}) bool {
+	return NotZero(a.t, i, msgAndArgs...)
+}

assert/forward_assertions_test.go

@@ -509,3 +509,29 @@ func TestRegexpWrapper(t *testing.T) {
 		True(t, assert.NotRegexp(regexp.MustCompile(tc.rx), tc.str))
 	}
 }
+
+func TestZeroWrapper(t *testing.T) {
+	assert := New(t)
+	mockAssert := New(new(testing.T))
+
+	for _, test := range zeros {
+		assert.True(mockAssert.Zero(test), "Zero should return true for %v", test)
+	}
+
+	for _, test := range nonZeros {
+		assert.False(mockAssert.Zero(test), "Zero should return false for %v", test)
+	}
+}
+
+func TestNotZeroWrapper(t *testing.T) {
+	assert := New(t)
+	mockAssert := New(new(testing.T))
+
+	for _, test := range zeros {
+		assert.False(mockAssert.NotZero(test), "Zero should return true for %v", test)
+	}
+
+	for _, test := range nonZeros {
+		assert.True(mockAssert.NotZero(test), "Zero should return false for %v", test)
+	}
+}

require/forward_requirements.go

@@ -209,3 +209,13 @@ func (a *Assertions) Regexp(rx interface{}, str interface{}, msgAndArgs ...inter
 func (a *Assertions) NotRegexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) {
 	NotRegexp(a.t, rx, str, msgAndArgs...)
 }
+
+// Zero asserts that i is the zero value for its type and returns the truth.
+func (a *Assertions) Zero(i interface{}, msgAndArgs ...interface{}) {
+	Zero(a.t, i, msgAndArgs...)
+}
+
+// NotZero asserts that i is not the zero value for its type and returns the truth.
+func (a *Assertions) NotZero(i interface{}, msgAndArgs ...interface{}) {
+	NotZero(a.t, i, msgAndArgs...)
+}

require/forward_requirements_test.go

@@ -258,3 +258,27 @@ func TestInDeltaWrapper(t *testing.T) {
 		t.Error("Check should fail")
 	}
 }
+
+func TestZeroWrapper(t *testing.T) {
+	require := New(t)
+	require.Zero(0)
+
+	mockT := new(MockT)
+	mockRequire := New(mockT)
+	mockRequire.Zero(1)
+	if !mockT.Failed {
+		t.Error("Check should fail")
+	}
+}
+
+func TestNotZeroWrapper(t *testing.T) {
+	require := New(t)
+	require.NotZero(1)
+
+	mockT := new(MockT)
+	mockRequire := New(mockT)
+	mockRequire.NotZero(0)
+	if !mockT.Failed {
+		t.Error("Check should fail")
+	}
+}

require/requirements.go

@@ -269,3 +269,17 @@ func EqualError(t TestingT, theError error, errString string, msgAndArgs ...inte
 		t.FailNow()
 	}
 }
+
+// Zero asserts that i is the zero value for its type and returns the truth.
+func Zero(t TestingT, i interface{}, msgAndArgs ...interface{}) {
+	if !assert.Zero(t, i, msgAndArgs...) {
+		t.FailNow()
+	}
+}
+
+// NotZero asserts that i is not the zero value for its type and returns the truth.
+func NotZero(t TestingT, i interface{}, msgAndArgs ...interface{}) {
+	if !assert.NotZero(t, i, msgAndArgs...) {
+		t.FailNow()
+	}
+}

require/requirements_test.go

@@ -264,3 +264,25 @@ func TestInDelta(t *testing.T) {
 		t.Error("Check should fail")
 	}
 }
+
+func TestZero(t *testing.T) {
+
+	Zero(t, "")
+
+	mockT := new(MockT)
+	Zero(mockT, "x")
+	if !mockT.Failed {
+		t.Error("Check should fail")
+	}
+}
+
+func TestNotZero(t *testing.T) {
+
+	NotZero(t, "x")
+
+	mockT := new(MockT)
+	NotZero(mockT, "")
+	if !mockT.Failed {
+		t.Error("Check should fail")
+	}
+}