Grails fail at test -app - grails

Question

I have my domain Class and my groovy class for unit test
class Product {
String product_code
String store
int price
String notes
//static hasOne = [description: Description]
static constraints = {
product_code blank:false, size: 1..15
price blank:false, scale: 2
store blank:false, size: 1..40
notes blank:true , size: 1..150
}
}
import org.apache.jasper.compiler.Node.ParamsAction;
import grails.test.mixin.*
import org.junit.*
import org.pricer.model.Product;
/**
* See the API for {#link grails.test.mixin.domain.DomainClassUnitTestMixin} for usage instructions
*/
#TestFor(Product)
class ProductTests {
void testSomething() {
if (Product.hasErrors()){
fail "not pass"
}else
assert "Pass"
}
}
when i try tu run test-app my ProductTest.testSomething i get
No signature of method: org.pricer.model.Product.hasErrors() is applicable for argument types: () values: []
Possible solutions: hasErrors(), getErrors(),
setErrors(org.springframework.validation.Errors), clearErrors(), hashCode()
groovy.lang.MissingMethodException: No signature of method: org.pricer.model.Product.hasErrors() is applicable for argument types: () values: []
Possible solutions: hasErrors(), getErrors(), setErrors(org.springframework.validation.Errors), clearErrors(), hashCode()
at
org.grails.datastore.gorm.GormStaticApi.methodMissing(GormStaticApi.groovy:97)
at org.pricer.ProductTests.testSomething(ProductTests.groovy:20)

Answer 1

You didn't instantiate domain class Product in your test. Try f.e.:
void testSomething() {
def product = new Product()
if (product.hasErrors()){
//do something
}
}

Answer 2

hasErrors() is an instance method. When you call Product.hasErrors() you're calling a class/static method, which in this case, does not exist.
So, as majkelo said, you need a Product instance first. But, you also need to trigger domain class validation so that if there are errors, hasErrors() will report them.
def product = new Product(product_code: 'ABC', store: 'StackOverflow', price: 1000000)
product.validate() /* You can also call product.save() to validate. */
if(product.hasErrors()) {
/* Do your thing */
}
A short-cut
You can combine validation and error checking like this:
if(product.validate()) {
/* validation passed. */
} else {
/* validation failed. */
}