How can you mock a property of type NameValueCollection?

[mts...@gmail.com]

Is it possible to mock the following property?

public NameValueCollection AppSettings {get;}

with something like:

mock.Expect(s => s.AppSettings["TestKey"]).Returns("TestValue");

[Daniel Cazzulino]

First it would have to be virtual.
Next, you could just have a new collection returned, which you populate as needed.

[andreister]

As Daniel mentioned, you need to make the property virtual.

Next, as soon as NameValueCollection indexer is not virtual, Moq
cannot mock it so it's not possible to mock it in a way you want.

However, getter/setter of NameValueCollection ARE virtual, so you can
use that:

var foo = new Mock<Foo>();
foo.Setup(x => x.AppSettings.Get("foo")).Returns("bar");
Assert.Equal("bar", foo.Object.AppSettings.Get("foo"));

(Note, that starting from Moq 3.0 "Expect" is is renamed to "Setup")

Or, as Daniel suggested, you can mock the whole collection, not just
one key/value.

[mts...@gmail.com]

I'm actually trying to mock System.Configuration.ConfigurationManger
so I created a wrapper

public interface IConfigurationManager
{
NameValueCollection AppSettings {get;}
ConnectionStringSettingsCollection ConnectionStrings {get;}
object GetSection (string sectionName);
}

I've subclassed ConfigurationManager to add extra functionality which
is why I wanted to Mock the AppSettings collection.

So using the following worked out perfectly

var configurationManager = new Mock<IConfigurationManager> ();
configurationManager.Expect (s => s.AppSettings.Get
("TestKey.Local")).Returns ("LocalValue");
configurationManager.Expect (s => s.AppSettings.Get
("TestKey.Development")).Returns ("DevelopmentValue");
configurationManager.Expect (s => s.AppSettings.Get
("TestKey")).Returns ("DefaultValue");

_configManager = new ConfigManager (configurationManager.Object,
ENVIRONMENT_TOKEN);

When AppSettings["TestKey"] gets called I get the expected value (ie
DefaultValue).

thank you

[Daniel Cazzulino]

very cool :)

--
Daniel Cazzulino | Developer Lead | XML MVP | Clarius Consulting | +1 425.329.3471