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无法读取 HostType（“Moles”）上的 ConfigurationManager.AppSettings

发布于 2024-12-12 20:06:16 字数 314 浏览 2 评论 0原文

如果 HostType 为 Moles，那么我无法通过 ConfigurationManager.AppSettings 获取数据，

它在 2-3 个月前对我来说工作正常。但它不起作用，我的所有测试用例都失败了（引发了空引用异常）。

请帮我修复。谢谢。

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揽月 2024-12-19 20:06:16

这是 .Net 4.0 中当前版本的 Moles 中的一个已知错误 - 您可以使用 Mole 配置管理器并让它返回您想要的值作为解决方法。

作为示例，这就是我如何为 Linq To SQL DataContext 设置测试，以在不连接到 SQL 的情况下获取默认构造函数的代码覆盖率。

[TestInitialize]
[HostType("Moles")]
public void Setup()
{
    MCodesConfigurationHelper.DataAccessSettingsGet = () =>
    {
        MCodesDataAccessSettings setting = new MCodesDataAccessSettings();
        setting.DatabaseConnectionStringGet = () => { return "this is a connection string."; };
        return setting;
    };

    MConfigurationManager.ConnectionStringsGet = () =>
    {
        MConnectionStringSettingsCollection strings = new MConnectionStringSettingsCollection();
        strings.ItemGetString = (string connectionString) =>
        {
            var cstring = new MConnectionStringSettings();
            cstring.ToString = () => { return connectionString; };
            cstring.ConnectionStringGet = () => { return connectionString; };
            return cstring;
        };
        return strings;
    };
    MDataContext.ConstructorString = (DataContext dataContext, string connection) => { };
}


[TestMethod]
[HostType("Moles")]
public void DefaultConstructorTest()
{
    using (MyDataContext target = new MyDataContext())
    {
        Assert.IsNotNull(target);
    }
}

This is a known bug in current versions of Moles in .Net 4.0 - You can Mole the configuration manager and have it return the values that you want as a workaround.

As an example, This is how I setup a test for a Linq To SQL DataContext to get code coverage for a default constructor without connecting to SQL.

[TestInitialize]
[HostType("Moles")]
public void Setup()
{
    MCodesConfigurationHelper.DataAccessSettingsGet = () =>
    {
        MCodesDataAccessSettings setting = new MCodesDataAccessSettings();
        setting.DatabaseConnectionStringGet = () => { return "this is a connection string."; };
        return setting;
    };

    MConfigurationManager.ConnectionStringsGet = () =>
    {
        MConnectionStringSettingsCollection strings = new MConnectionStringSettingsCollection();
        strings.ItemGetString = (string connectionString) =>
        {
            var cstring = new MConnectionStringSettings();
            cstring.ToString = () => { return connectionString; };
            cstring.ConnectionStringGet = () => { return connectionString; };
            return cstring;
        };
        return strings;
    };
    MDataContext.ConstructorString = (DataContext dataContext, string connection) => { };
}


[TestMethod]
[HostType("Moles")]
public void DefaultConstructorTest()
{
    using (MyDataContext target = new MyDataContext())
    {
        Assert.IsNotNull(target);
    }
}

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