74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
|
package lexer
|
||
|
|
||
|
import (
|
||
|
"testing"
|
||
|
|
||
|
"monkey/token"
|
||
|
)
|
||
|
|
||
|
func TestNextToken(t *testing.T) {
|
||
|
input := `let five = 5;
|
||
|
let ten = 10;
|
||
|
let add = fn(x, y){
|
||
|
x + y;
|
||
|
};
|
||
|
let result = add(five, ten);
|
||
|
`
|
||
|
tests := []struct {
|
||
|
expectedType token.TokenType
|
||
|
expectedLiteral string
|
||
|
}{
|
||
|
{token.LET, "let"},
|
||
|
{token.IDENT, "five"},
|
||
|
{token.ASSIGN, "="},
|
||
|
{token.INT, "5"},
|
||
|
{token.SEMICOLON, ";"},
|
||
|
|
||
|
{token.LET, "let"},
|
||
|
{token.IDENT, "ten"},
|
||
|
{token.ASSIGN, "="},
|
||
|
{token.INT, "10"},
|
||
|
{token.SEMICOLON, ";"},
|
||
|
|
||
|
{token.LET, "let"},
|
||
|
{token.IDENT, "add"},
|
||
|
{token.ASSIGN, "="},
|
||
|
{token.FUNCTION, "fn"},
|
||
|
{token.LPAREN, "("},
|
||
|
{token.IDENT, "x"},
|
||
|
{token.COMMA, ","},
|
||
|
{token.IDENT, "y"},
|
||
|
{token.RPAREN, ")"},
|
||
|
{token.LBRACE, "{"},
|
||
|
{token.IDENT, "x"},
|
||
|
{token.PLUS, "+"},
|
||
|
{token.IDENT, "y"},
|
||
|
{token.SEMICOLON, ";"},
|
||
|
{token.RBRACE, "}"},
|
||
|
{token.SEMICOLON, ";"},
|
||
|
|
||
|
{token.LET, "let"},
|
||
|
{token.IDENT, "result"},
|
||
|
{token.ASSIGN, "="},
|
||
|
{token.IDENT, "add"},
|
||
|
{token.LPAREN, "("},
|
||
|
{token.IDENT, "five"},
|
||
|
{token.COMMA, ","},
|
||
|
{token.IDENT, "ten"},
|
||
|
{token.RPAREN, ")"},
|
||
|
{token.SEMICOLON, ";"},
|
||
|
{token.EOF, ""},
|
||
|
}
|
||
|
|
||
|
l := new(input)
|
||
|
for i, tt := range tests {
|
||
|
tok := l.next_token()
|
||
|
if tok.Type != tt.expectedType {
|
||
|
t.Fatalf("test[%d] - tokentype wrong. expected=%q, got=%q", i, tt.expectedType, tok.Type)
|
||
|
}
|
||
|
if tok.Literal != tt.expectedLiteral {
|
||
|
t.Fatalf("tests[%d] - literal wrong. expected=%q, got=%q", i, tt.expectedLiteral, tok.Literal)
|
||
|
}
|
||
|
}
|
||
|
}
|