Lexer Test

lexer_test.cs

[Test]
public void TestLexerNextToken()
{
    string input = @"1 + 2 * (12 - 6) / 3 + 2 ^ 3
+ ((4+3) *   4)
/ 4
";

    var tests = new[]
    {
        new Token {Type = TokenType.INT, Literal="1"},
        new Token {Type = TokenType.PLUS, Literal="+"},
        new Token {Type = TokenType.INT, Literal="2"},
        new Token {Type = TokenType.MULTIPLY, Literal="*"},
        new Token {Type = TokenType.LPAREN, Literal="("},
       //....
    };
    Lexer lexer = new Lexer(input);
    foreach (var tt in tests)
    {
        var actualToken = lexer.NextToken();
        Assert.AreEqual(tt.Type, actualToken.Type, $"expect TokenType {tt.Type}, got {actualToken.Type}");
       Assert.AreEqual(tt.Literal, actualToken.Literal, $"expect Token's Literal {tt.Literal}, got {actualToken.Literal}");
    }
}