Can I handle parameter like the case insensitive string?

[Андрей]

 

I have the class under test:

1.public class AppManager {
2.    public string[] GetAppSets() => Registry.LocalMachine
3.        .OpenSubKey(@"SOFTWARE\Autodesk\AutoCAD", false)
4.        ?.GetSubKeyNames();
5.}

Also, I have the test for `GetAppSets` method:

01.[Test]
02.public void Foo_Returns_ValidValue() {
03.
04.    const string subkey = @"SOFTWARE\Autodesk\AutoCAD";
05.    /* The sets of applications which are based on
06.     * AutoCAD 2009-2017. */
07.    string[] fakeSets = new[] { "R17.2", "R18.0",
08.        "R18.1", "R18.2", "R19.0", "R19.1", "R20.0",
09.        "R20.1","R21.0" };
10.
11.    RegistryKey rk = Mock.Create<RegistryKey>();
12.
13.    Mock.Arrange(() => rk.GetSubKeyNames()).Returns(
14.        fakeSets);
15.
16.    Mock.Arrange(() => Registry.LocalMachine.OpenSubKey
17.    (subkey, false)).Returns(rk);
18.
19.    AppManager appMng = new AppManager();
20.    string[] appSets = appMng.GetAppSets();
21.
22.    Assert.AreEqual(fakeSets, appSets);
23.}

It works. But my test will be failure if `GetAppSets` method uses "Software\Autodesk\AutoCAD" or "software\autodesk\autocad" string instead of "SOFTWARE\Autodesk\AutoCAD".

So, at this case I need to handle parameter like the case insensitive string. Is it possible?

 

 

[Андрей]

The addition info: the `appSets` variable will be `null` if string case will be changed (because that registry key doesn't exist on my computer).

[Svetlozar]

Hi,

Thank you for the great question! 

So, at this case I need to handle parameter like the case insensitive string. Is it possible?
Yes, you can get flexible with our matcher using the Arg.Matches mechanism. For more information you can have a look at this blog post - Handling Arguments in JustMock Arrangements, more specifically - the last paragraph - Using Lambdas for Argument Matching.

In your case I guess that would do the job 

Mock.Arrange(() => Registry.LocalMachine.OpenSubKey(Arg.Matches<string>(s => s.ToLower() == subkey.ToLower()), false)).Returns(rk);

Let us know if you have more questions.

Regards,
Svetlozar
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