public void RandomString_WithSpecificChars_ShouldReturnSpecificString() { // Arrange // Act string random = RandomString(50000, letters: "AB", numbers: "12", symbols: "!?"); // Assert Assert.Equal(50000, random.Length); Assert.False(random.Any(c => RANDOM_LETTERS.Replace("AB", string.Empty).Contains(c))); Assert.False(random.Any(c => RANDOM_NUMBER.Replace("12", string.Empty).Contains(c))); Assert.False(random.Any(c => RANDOM_SYMBOLS.Replace("!?", string.Empty).Contains(c))); }