标签:c unit-testing moq ninject
使用Moq进行单元测试时,出现以下错误:
Message: System.NotSupportedException :
Invalid setup on non-virtual (overridable in VB) member:
cm => cm.AppSettings[It.IsAny<string>()]
根据这些发现,我理解最好使用Moq的抽象类或接口.
> Why does the property I want to mock need to be virtual?
> Moq is throwing Invalid setup on a non-overridable member, when class is in Service Project
> Invalid setup on a non-virtual (overridable in VB) member
> Moq: Invalid setup on a non-overridable member: x => x.GetByTitle(“asdf”)
简而言之,我完成了我的作业. =)
但是,如果我实际使用的是接口呢?
ConfigurationServiceTests
[TestFixture]
public class ConfigurationServiceTests {
[Test]
public void DialectShouldQueryConfigurationManagerAppSettings() {
// Given
configurationManagerMock
.Setup(cm => cm.AppSettings[It.IsAny<string>()])
.Returns(It.IsAny<string>());
// When
var dialect = configurationService.Dialect;
// Then
dialect.Should().BeOfType<string>();
configurationManagerMock.Verify(cm => cm.AppSettings[It.IsAny<string>()]);
}
[SetUp]
public void ConfigurationServiceSetUp() {
configurationManagerMock = new Mock<IConfigurationManager>();
configurationService =
new ConfigurationService(configurationManagerMock.Object);
}
private Mock<IConfigurationManager> configurationManagerMock;
private IConfigurationService configurationService;
}
IConfigurationManager
public interface IConfigurationManager {
NameValueCollection AppSettings { get; }
ConnectionStringSettingsCollection ConnectionStrings { get; }
}
IConfigurationService
public interface IConfigurationService {
string ConnectionDriver { get; }
string ConnectiongString { get; }
string Dialect { get; }
}
ConfigurationService
public class ConfigurationService : IConfigurationService {
public ConfigurationService(IConfigurationManager configurationManager) {
this.configurationManager = configurationManager;
}
public string ConnectionDriver {
get { return configurationManager.AppSettings["ConnectionDriver"]; }
}
public string ConnectionString {
get {
return configurationManager
.ConnectionStrings[ConnectionStringKey]
.ConnectionString;
}
}
public string Dialect {
get { return configurationManager.AppSettings[DialectKey]; }
}
private readonly IConfigurationManager configurationManager;
private const string ConnectionStringKey = "DefaultConnectionString";
private const string DialectKey = "Dialect";
}
为什么我创建了IConfigurationManager接口?
> Unit Testable Configuration Manager
除此之外,我想在我的生产代码中使用Ninject直接绑定它.所以我不需要具体的接口实现,因此我对上述异常感到非常惊讶.
kernel.Bind<IConfiguration>().To<ConfigurationManager>().InSingletonScope();
这样做可以让我对ConfigurationService进行单元测试.
任何的想法?
解决方法:
您正在尝试模拟NameValueCollection的索引器而不是属性getter.
您需要执行类似的操作(注意SetupGet而不是安装程序):
.SetupGet(cm => cm.AppSettings).Returns(....)
如果你想要“mocked”集合返回“任何东西”,你可能需要覆盖实际的类(检查是否有可能).
如果您知道要查找的设置 – 从Mock返回填充的集合可能是一个选项:
configurationManagerMock
.SetupGet(cm => cm.AppSettings)
.Returns(new NameValueCollection { {"SettingName", "Value"}});
另一种选择是返回一些自定义接口或IDictionary< string,string>所以你也可以模拟索引:
interface IConfigurationManager
{
IDictionary<string,string> AppSettings { get; }
...
标签:c,unit-testing,moq,ninject 来源: https://codeday.me/bug/20190517/1119725.html
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