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package evaluator
import (
"mana/lexer"
"mana/object"
"mana/parser"
"testing"
)
func TestEvalIntegerExpression(t *testing.T) {
tests := []struct {
input string
expected int64
}{
{"5", 5},
{"10", 10},
{"-5", -5},
{"-10", -10},
{"5 + 5 + 5 + 5 - 10", 10},
{"2 * 2 * 2 * 2 * 2", 32},
{"-50 + 100 + -50", 0},
{"5 * 2 + 10", 20},
{"5 + 2 * 10", 25},
{"20 + 2 * -10", 0},
{"50 / 2 * 2 + 10", 60},
{"2 * (5 + 10)", 30},
{"3 * 3 * 3 + 10", 37},
{"3 * (3 * 3) + 10", 37},
{"(5 + 10 * 2 + 15 / 3) * 2 + -10", 50},
}
for _, tt := range tests {
evaluated := testEval(tt.input)
testIntegerObject(t, evaluated, tt.expected)
}
}
func TestEvalBooleanExpression(t *testing.T) {
tests := []struct {
input string
expected bool
}{
{"true", true},
{"false", false},
{"1 < 2", true},
{"1 > 2", false},
{"1 < 1", false},
{"1 > 1", false},
{"1 == 1", true},
{"1 != 1", false},
{"1 == 2", false},
{"1 != 2", true},
{"true == true", true},
{"false == false", true},
{"true == false", false},
{"true != false", true},
{"false != true", true},
{"(1 < 2) == true", true},
{"(1 < 2) == false", false},
{"(1 > 2) == true", false},
{"(1 > 2) == false", true},
}
for _, tt := range tests {
evaluated := testEval(tt.input)
testBooleanObject(t, evaluated, tt.expected)
}
}
func TestBangOperator(t *testing.T) {
tests := []struct {
input string
expected bool
}{
{"!true", false},
{"!false", true},
{"!5", false},
{"!!true", true},
{"!!false", false},
{"!!5", true},
}
for _, tt := range tests {
evaluated := testEval(tt.input)
testBooleanObject(t, evaluated, tt.expected)
}
}
func testEval(input string) object.Object {
l := lexer.New(input)
p := parser.New(l)
program := p.ParseProgram()
return Eval(program)
}
func testIntegerObject(t *testing.T, obj object.Object, expected int64) bool {
result, ok := obj.(*object.Integer)
if !ok {
t.Errorf("object is not Integer. got=%T (%+v)", obj, obj)
return false
}
if result.Value != expected {
t.Errorf("object has wrong value. got=%d, want=%d", result.Value, expected)
return false
}
return true
}
func testBooleanObject(t *testing.T, obj object.Object, expected bool) bool {
result, ok := obj.(*object.Boolean)
if !ok {
t.Errorf("object is not Boolean. got=%T (%+v)", obj, obj)
return false
}
if result.Value != expected {
t.Errorf("object has wrong value. got=%t, want=%t", result.Value, expected)
return false
}
return true
}
|
