add assert positive/negative

assert/assertion_compare.go

@@ -342,6 +342,24 @@ func LessOrEqual(t TestingT, e1 interface{}, e2 interface{}, msgAndArgs ...inter
 	return compareTwoValues(t, e1, e2, []CompareType{compareLess, compareEqual}, "\"%v\" is not less than or equal to \"%v\"", msgAndArgs)
 }
 
+// Positive asserts that the specified element is positive
+//
+//    assert.Positive(t, 1)
+//    assert.Positive(t, 1.23)
+func Positive(t TestingT, e interface{}, msgAndArgs ...interface{}) bool {
+	zero := reflect.Zero(reflect.TypeOf(e))
+	return compareTwoValues(t, e, zero.Interface(), []CompareType{compareGreater}, "\"%v\" is not positive", msgAndArgs)
+}
+
+// Negative asserts that the specified element is negative
+//
+//    assert.Negative(t, -1)
+//    assert.Negative(t, -1.23)
+func Negative(t TestingT, e interface{}, msgAndArgs ...interface{}) bool {
+	zero := reflect.Zero(reflect.TypeOf(e))
+	return compareTwoValues(t, e, zero.Interface(), []CompareType{compareLess}, "\"%v\" is not negative", msgAndArgs)
+}
+
 func compareTwoValues(t TestingT, e1 interface{}, e2 interface{}, allowedComparesResults []CompareType, failMessage string, msgAndArgs ...interface{}) bool {
 	if h, ok := t.(tHelper); ok {
 		h.Helper()

assert/assertion_compare_test.go

@@ -251,6 +251,82 @@ func TestLessOrEqual(t *testing.T) {
 	}
 }
 
+func TestPositive(t *testing.T) {
+	mockT := new(testing.T)
+
+	if !Positive(mockT, 1) {
+		t.Error("Positive should return true")
+	}
+
+	if !Positive(mockT, 1.23) {
+		t.Error("Positive should return true")
+	}
+
+	if Positive(mockT, -1) {
+		t.Error("Positive should return false")
+	}
+
+	if Positive(mockT, -1.23) {
+		t.Error("Positive should return false")
+	}
+
+	// Check error report
+	for _, currCase := range []struct {
+		e   interface{}
+		msg string
+	}{
+		{e: int(-1), msg: `"-1" is not positive`},
+		{e: int8(-1), msg: `"-1" is not positive`},
+		{e: int16(-1), msg: `"-1" is not positive`},
+		{e: int32(-1), msg: `"-1" is not positive`},
+		{e: int64(-1), msg: `"-1" is not positive`},
+		{e: float32(-1.23), msg: `"-1.23" is not positive`},
+		{e: float64(-1.23), msg: `"-1.23" is not positive`},
+	} {
+		out := &outputT{buf: bytes.NewBuffer(nil)}
+		False(t, Positive(out, currCase.e))
+		Contains(t, string(out.buf.Bytes()), currCase.msg)
+	}
+}
+
+func TestNegative(t *testing.T) {
+	mockT := new(testing.T)
+
+	if !Negative(mockT, -1) {
+		t.Error("Negative should return true")
+	}
+
+	if !Negative(mockT, -1.23) {
+		t.Error("Negative should return true")
+	}
+
+	if Negative(mockT, 1) {
+		t.Error("Negative should return false")
+	}
+
+	if Negative(mockT, 1.23) {
+		t.Error("Negative should return false")
+	}
+
+	// Check error report
+	for _, currCase := range []struct {
+		e   interface{}
+		msg string
+	}{
+		{e: int(1), msg: `"1" is not negative`},
+		{e: int8(1), msg: `"1" is not negative`},
+		{e: int16(1), msg: `"1" is not negative`},
+		{e: int32(1), msg: `"1" is not negative`},
+		{e: int64(1), msg: `"1" is not negative`},
+		{e: float32(1.23), msg: `"1.23" is not negative`},
+		{e: float64(1.23), msg: `"1.23" is not negative`},
+	} {
+		out := &outputT{buf: bytes.NewBuffer(nil)}
+		False(t, Negative(out, currCase.e))
+		Contains(t, string(out.buf.Bytes()), currCase.msg)
+	}
+}
+
 func Test_compareTwoValuesDifferentValuesTypes(t *testing.T) {
 	mockT := new(testing.T)