public void Is_valid_when_no_associated_products_exist()
{
var categoryID = 1;
var proxyMock = new Mock <IProductDataProxy>();
proxyMock.Setup(proxy => proxy.GetByCategory(categoryID))
.Returns(Enumerable.Empty <Product>());
var rule = new CanDeleteCategoryRule(categoryID, proxyMock.Object);
rule.Validate().IsValid.ShouldBe(true);
rule.ErrorMessage.ShouldBe(null);
}
public void Is_invalid_when_associated_products_exist()
{
var categoryID = 1;
var proxyMock = new Mock <IProductDataProxy>();
proxyMock.Setup(proxy => proxy.GetByCategory(categoryID))
.Returns(new[] { new Product() });
var rule = new CanDeleteCategoryRule(categoryID, proxyMock.Object);
rule.Validate().IsValid.ShouldBe(false);
rule.ErrorMessage.ShouldNotBe(null);
}
public void Is_valid_when_no_associated_products_exist()
{
var categoryID = 1;
var proxyMock = new Mock <IProductDataProxy>();
proxyMock.Setup(proxy => proxy.GetByCategory(categoryID)).Returns(Enumerable.Empty <Product>());
var rule = new CanDeleteCategoryRule(categoryID, proxyMock.Object);
bool isValid = rule.Validate().IsValid;
Assert.IsTrue(isValid, "Rule validation result should be TRUE!");
Assert.IsNull(rule.ErrorMessage, "Rule Error message should be NULL!");
}