Golang using Null*s in tests

I have some Go tests, and I am trying to use Null*s correctly, but go test is giving errors and I am not sure what is wrong.

Here is the error message:

go test ./...
utils/db.go:1:1: expected 'package', found 'EOF'
?   	mobifit	[no test files]
# mobifit/app/entities
app/entities/user_test.go:34: cannot use dateOfBirth (type func() time.Time) as type time.Time in assignment
app/entities/user_test.go:58: User.Gender undefined (type User has no method Gender)
app/entities/user_test.go:59: User.DateOfBirth undefined (type User has no method DateOfBirth)
app/entities/user_test.go:60: User.Height undefined (type User has no method Height)
app/entities/user_test.go:61: User.CurrentWeight undefined (type User has no method CurrentWeight)
app/entities/user_test.go:65: User.Email undefined (type User has no method Email)
app/entities/user_test.go:66: User.HashedPassword undefined (type User has no method HashedPassword)
app/entities/user_test.go:67: User.FirstName undefined (type User has no method FirstName)
app/entities/user_test.go:68: User.LastName undefined (type User has no method LastName)
app/entities/user_test.go:69: User.CreatedAt undefined (type User has no method CreatedAt)
app/entities/user_test.go:69: too many errors
FAIL	mobifit/app/entities [build failed]
?   	mobifit/app/handlers	[no test files]

Here are the tests:

package entities

import (
	// "database/sql"
	// "github.com/go-sql-driver/mysql"
	"github.com/stretchr/testify/assert"
	"testing"
	"time"
)

var (
	email          = "leebrooks0@gmail.com"
	hashedPassword = "password"
	firstName      = "Lee"
	lastName       = "Brooks"
	gender         = Male
	dateOfBirth    = time.Now
	height         = 1.85
	currentWeight  = 101.3
)

func privacyConcernedUser() *User {
	user := new(User)
	user.Email.String = email
	user.HashedPassword.String = hashedPassword
	user.FirstName.String = firstName
	user.LastName.String = lastName
	return user
}

func normalUser() *User {
	user := privacyConcernedUser()
	user.Gender.String = gender
	user.DateOfBirth.Time = dateOfBirth
	user.Height.Float64 = height
	user.CurrentWeight.Float64 = currentWeight
	return user
}

func TestSignUpPrivacyConcernedUser(t *testing.T) {
	user := privacyConcernedUser()
	user.SignUp()

	checkMandatoryValues(t, user)

	assert.Nil(t, user.Gender.String)
	assert.Nil(t, user.DateOfBirth.Time)
	assert.Nil(t, user.Height.Float64)
	assert.Nil(t, user.CurrentWeight.Float64)
}

func TestSignUpNormalUser(t *testing.T) {
	user := normalUser()
	user.SignUp()

	checkMandatoryValues(t, user)

	assert.Equal(t, User.Gender.String, gender)
	assert.Equal(t, User.DateOfBirth.Time, dateOfBirth)
	assert.Equal(t, User.Height.Float64, height)
	assert.Equal(t, User.CurrentWeight.Float64, currentWeight)
}

func checkMandatoryValues(t *testing.T, user *User) {
	assert.Equal(t, User.Email.String, email)
	assert.Equal(t, User.HashedPassword.String, hashedPassword)
	assert.Equal(t, User.FirstName.String, firstName)
	assert.Equal(t, User.LastName.String, lastName)
	assert.NotNil(t, User.CreatedAt.Time) // TODO: Should rather check for not empty
}

UPDATE: Where is the User type?

type User struct {
	Id             sql.NullInt64
	Email          sql.NullString
	HashedPassword sql.NullString
	RoleId         sql.NullInt64
	FirstName      sql.NullString
	LastName       sql.NullString
	Gender         sql.NullString
	DateOfBirth    mysql.NullTime
	Height         sql.NullFloat64
	CurrentWeight  sql.NullFloat64
	CreatedAt      mysql.NullTime
	ConfirmedAt    mysql.NullTime
	LastActivityAt mysql.NullTime
	DeletedAt      mysql.NullTime
}

func (u *User) SignUp() {

}

For this error:

app/entities/user_test.go:34: cannot use dateOfBirth (type func() time.Time) as type time.Time in assignment

You seem to be trying to assign the function time.Now to a time.Time field. Presumably you want to call the function?

For these errors:

app/entities/user_test.go:58: User.Gender undefined (type User has no method Gender)
app/entities/user_test.go:59: User.DateOfBirth undefined (type User has no method DateOfBirth)
...

It looks like you're trying to access fields on the type User, when you really want to be checking the variable user (note the case difference).

Lastly, if you are creating sample data with sql.Null* fields and want it to resemble real data, you should probably set the Valid field to true so that you don't trip up code that is actually checking for NULL values.