Fix issues report from testifylint (#267)

This PR fixes issues report from
[testifylint](https://github.com/Antonboom/testifylint).
This PR contributes to #264.

database_unit_test.go

@@ -427,87 +427,87 @@ func TestError_Value(t *testing.T) {
 	c1 := Parse("")
 	v1, e1 := c1.Value()
 	require.NoError(t, e1)
-	assert.Equal(t, v1, nil)
+	assert.Nil(t, v1)
 
 	c2 := NewDateTime(c1)
 	v2, e2 := c2.Value()
 	require.NoError(t, e2)
-	assert.Equal(t, v2, nil)
+	assert.Nil(t, v2)
 
 	c3 := NewDateTimeMilli(c1)
 	v3, e3 := c3.Value()
 	require.NoError(t, e3)
-	assert.Equal(t, v3, nil)
+	assert.Nil(t, v3)
 
 	c4 := NewDateTimeMicro(c1)
 	v4, e4 := c4.Value()
 	require.NoError(t, e4)
-	assert.Equal(t, v4, nil)
+	assert.Nil(t, v4)
 
 	c5 := NewDateTimeNano(c1)
 	v5, e5 := c5.Value()
 	require.NoError(t, e5)
-	assert.Equal(t, v5, nil)
+	assert.Nil(t, v5)
 
 	c6 := NewDate(c1)
 	v6, e6 := c6.Value()
 	require.NoError(t, e6)
-	assert.Equal(t, v6, nil)
+	assert.Nil(t, v6)
 
 	c7 := NewDateMilli(c1)
 	v7, e7 := c7.Value()
 	require.NoError(t, e7)
-	assert.Equal(t, v7, nil)
+	assert.Nil(t, v7)
 
 	c8 := NewDateMicro(c1)
 	v8, e8 := c8.Value()
 	require.NoError(t, e8)
-	assert.Equal(t, v8, nil)
+	assert.Nil(t, v8)
 
 	c9 := NewDateNano(c1)
 	v9, e9 := c9.Value()
 	require.NoError(t, e9)
-	assert.Equal(t, v9, nil)
+	assert.Nil(t, v9)
 
 	c10 := NewTime(c1)
 	v10, e10 := c10.Value()
 	require.NoError(t, e10)
-	assert.Equal(t, v10, nil)
+	assert.Nil(t, v10)
 
 	c11 := NewTimeMilli(c1)
 	v11, e11 := c11.Value()
 	require.NoError(t, e11)
-	assert.Equal(t, v11, nil)
+	assert.Nil(t, v11)
 
 	c12 := NewTimeMicro(c1)
 	v12, e12 := c12.Value()
 	require.NoError(t, e12)
-	assert.Equal(t, v12, nil)
+	assert.Nil(t, v12)
 
 	c13 := NewTimeNano(c1)
 	v13, e13 := c13.Value()
 	require.NoError(t, e13)
-	assert.Equal(t, v13, nil)
+	assert.Nil(t, v13)
 
 	c14 := NewTimestamp(c1)
 	v14, e14 := c14.Value()
 	require.NoError(t, e14)
-	assert.Equal(t, v14, nil)
+	assert.Nil(t, v14)
 
 	c15 := NewTimestampMilli(c1)
 	v15, e15 := c15.Value()
 	require.NoError(t, e15)
-	assert.Equal(t, v15, nil)
+	assert.Nil(t, v15)
 
 	c16 := NewTimestampMicro(c1)
 	v16, e16 := c16.Value()
 	require.NoError(t, e16)
-	assert.Equal(t, v16, nil)
+	assert.Nil(t, v16)
 
 	c17 := NewTimestampNano(c1)
 	v17, e17 := c17.Value()
 	require.NoError(t, e17)
-	assert.Equal(t, v17, nil)
+	assert.Nil(t, v17)
 }
 
 type Person struct {
@@ -907,10 +907,10 @@ func TestCarbon_Issue240(t *testing.T) {
 	require.NoError(t, emptyErr)
 	assert.Equal(t, "0001-01-01 00:00:00 +0000 UTC", person.Birthday1.StdTime().String())
 	assert.Equal(t, "0001-01-01 00:00:00 +0000 UTC", person.Birthday2.StdTime().String())
-	assert.Equal(t, true, person.Birthday1.IsZero())
-	assert.Equal(t, true, person.Birthday2.IsZero())
-	assert.Equal(t, false, person.Birthday1.IsValid())
-	assert.Equal(t, false, person.Birthday2.IsValid())
+	assert.True(t, person.Birthday1.IsZero())
+	assert.True(t, person.Birthday2.IsZero())
+	assert.False(t, person.Birthday1.IsValid())
+	assert.False(t, person.Birthday2.IsValid())
 }
 
 // https://github.com/dromara/carbon/issues/243

language_unit_test.go

@@ -88,8 +88,8 @@ func TestLanguage_SetResources1(t *testing.T) {
 	for index, test := range tests {
 		c1 := c.Parse(test.input1)
 		c2 := c.Parse(test.input2)
-		assert.Nil(c1.Error)
-		assert.Nil(c2.Error)
+		assert.NoError(c1.Error)
+		assert.NoError(c2.Error)
 		assert.Equal(test.expected, c1.DiffForHumans(c2), "Current test index is "+strconv.Itoa(index))
 	}
 }

parser_unit_test.go

@@ -147,13 +147,13 @@ func TestCarbon_ParseByLayout(t *testing.T) {
 }
 
 func TestError_ParseByLayout(t *testing.T) {
-	assert.NotNil(t, ParseByLayout("2020-08-05", "2006-03-04", "xxx").Error, "It should catch an exception in ParseByLayout")
-	assert.NotNil(t, ParseByLayout("xxx", "2006-03-04", PRC).Error, "It should catch an exception in ParseByLayout")
+	assert.Error(t, ParseByLayout("2020-08-05", "2006-03-04", "xxx").Error, "It should catch an exception in ParseByLayout")
+	assert.Error(t, ParseByLayout("xxx", "2006-03-04", PRC).Error, "It should catch an exception in ParseByLayout")
 }
 
 func TestError_ParseByFormat(t *testing.T) {
-	assert.NotNil(t, ParseByFormat("2020-08-05", "Y-m-d", "xxx").Error, "It should catch an exception in ParseByFormat()")
-	assert.NotNil(t, ParseByFormat("xxx", "Y-m-d", PRC).Error, "It should catch an exception in ParseByFormat")
+	assert.Error(t, ParseByFormat("2020-08-05", "Y-m-d", "xxx").Error, "It should catch an exception in ParseByFormat()")
+	assert.Error(t, ParseByFormat("xxx", "Y-m-d", PRC).Error, "It should catch an exception in ParseByFormat")
 }
 
 // https://github.com/dromara/carbon/issues/202