public void ShouldRemoveXsOfStringMaintainingFirstAndLastX()
{
StringFilter firstString = new StringFilter("xxHxix");
firstString.removeXs();
StringFilter secondString = new StringFilter("abcd");
secondString.removeXs();
StringFilter thirdString = new StringFilter("xabcdx");
thirdString.removeXs();
StringFilter fourthString = new StringFilter("");
fourthString.removeXs();
StringFilter fiftyString = new StringFilter("x");
fiftyString.removeXs();
Assert.Equal("abcd", secondString.GetString());
Assert.Equal("xabcdx", thirdString.GetString());
Assert.Equal("", fourthString.GetString());
Assert.Equal("x", fiftyString.GetString());
Assert.Equal("xHix", firstString.GetString());
}
