How do I Unit test is URL valid in c#?

Question

I have a class that checks to see if the URL is valid using the method below:

return !string.IsNullOrEmpty(url) && 
        Uri.TryCreate(url, UriKind.Absolute, out uriResult) && 
        (uriResult.Scheme == Uri.UriSchemeHttp || 
        uriResult.Scheme == Uri.UriSchemeHttps);

I was wondering how I would unit test the code to check to see if the URL is valid or not.

So far, i have a unit test that only partially covers the unit test which is below.

string url = "newUrl";
var result = UrlUtility.IsValid(url);
Assert.IsFalse(result);

Any help would be much appreciated. Thanks

Answer 1

You should cover all conditions of IsValid() method:

[TestMethod]
public void TestEmptyUrl()
{
    string url = "";

    Assert.IsFalse(UrlUtility.IsValid(url));
}

[TestMethod]
public void TestInvalidUrl()
{
    string url = "bad url";

    Assert.IsFalse(UrlUtility.IsValid(url));
}

[TestMethod]
public void TestRelativeUrl()
{
    string url = "/api/Test";

    Assert.IsFalse(UrlUtility.IsValid(url));
}

[TestMethod]
public void TestUrlWithInvalidScheme()
{
    string url = "htt://localhost:4000/api/Test";

    Assert.IsFalse(UrlUtility.IsValid(url));
}

[TestMethod]
public void TestUrlWithHttpScheme()
{
    string url = "http://localhost:4000/api/Test";

    Assert.IsTrue(UrlUtility.IsValid(url));
}

[TestMethod]
public void TestUrlWithHttpsScheme()
{
    string url = "https://localhost:4000/api/Test";

    Assert.IsTrue(UrlUtility.IsValid(url));
}

Answer 2

You can give some values for the url. For example you can test the next case:

string url = string.Empty;
var result = UrlUtility.IsValid(url);
Assert.IsFalse(result);

Also, you can read about the Uri.UriSchemeHttp and Uri.UriSchemeHttps on the internet and try to make some test to respect or to ignore this uri scheme. Hope it helps!