restructure project

internal/ast/ast_test.go

@@ -0,0 +1,30 @@
+package ast
+
+import (
+	"github.com/stretchr/testify/assert"
+	"monkey/internal/token"
+	"testing"
+)
+
+func TestString(t *testing.T) {
+	program := &Program{
+		Statements: []Statement{
+			&ExpressionStatement{
+				Token: token.Token{Type: token.IDENT, Literal: "myVar"},
+				Expression: &BindExpression{
+					Token: token.Token{Type: token.BIND, Literal: ":="},
+					Left: &Identifier{
+						Token: token.Token{Type: token.IDENT, Literal: "myVar"},
+						Value: "myVar",
+					},
+					Value: &Identifier{
+						Token: token.Token{Type: token.IDENT, Literal: "anotherVar"},
+						Value: "anotherVar",
+					},
+				},
+			},
+		},
+	}
+
+	assert.Equal(t, "myVar:=anotherVar", program.String())
+}