Unit Test in C#.NET.

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C#

Hi I have a simple method, where It takes a string as parameter (domainname//firstname.lastname) and takes out (domainname//) and returns string as just firstname.lastname.

I need to unit test for the following case.

check for single slash (domainname/firstname.lastname)
Check for empty string
Check for null value
Check wheather the string contains // or not

I wrote the following but it does not make any sense to me, coz this is completely wrong.

#region Checking for null value
    [TestMethod()]
    public void CheckForNullValueTest()
    {
        string expected = "";
        string source = @"domainname//hari.gillala";
        string actual = Function.RemoveSlash(source);
        assert.Equal(expected, actual);
    }
    #endregion
    #region Checking for empty
    [TestMethod()]
    public void CheckForEmptyValueTest()
    {
        string expected = string.empty;
        string source = @"domainname//hari.gillala";
        string actual = Function.RemoveSlash(source);
        assert.Equal(expected, actual);
    }
    #endregion
    #region Checking for singleslash
    [TestMethod()]
    public void CheckForSingleSlashTest()
    {
        string expected = @"domainname/hari.gillala";
        string source = "domainname//hari.gillala";
        string actual = Function.RemoveSlash(source);
        assert.Equal(expected, actual);
    }
    #endregion
    #region Checking for Doubleslash
    [TestMethod()]
    public void CheckForDoubleSlashTest()
    {
        string expected = @"domainname//hari.gillala";
        string source = "domainname//hari.gillala";
        string actual = Function.RemoveSlash(source);
        assert.Equal(expected, actual);
    }
    #endregion

Could any one correct me, where I am wrong. And help me to write the unit test for all the cases for the function.

Thank you