68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
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package parser
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import (
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"monkey/ast"
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"monkey/lexer"
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"testing"
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)
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func TestLetStatement(l_test *testing.T) {
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input := `
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let x = 4;
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let y = 19;
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let foobar = 8948398493;
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`
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l_lexer := lexer.New(input)
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l_parser := New(l_lexer)
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program := l_parser.ParseProgram()
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if program == nil {
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l_test.Fatalf("ParseProgram() returned nil")
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}
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if len(program.Statements) != 3 {
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l_test.Fatalf("program.Statements does not contain 3 statements, got=%d", len(program.Statements))
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}
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tests := []struct {
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expected_identifier string
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}{
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{"x"},
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{"y"},
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{"foobar"},
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}
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for i, tt := range tests {
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statement := program.Statements[i]
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if !testLetStatement(l_test, statement, tt.expected_identifier) {
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return
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}
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}
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}
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func testLetStatement(l_test *testing.T, statement ast.Statement, name string) bool {
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if statement.TokenLiteral() != "let" {
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l_test.Errorf("statement.TokenLiteral not let, got=%q", statement.TokenLiteral())
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return false
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}
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let_statement, ok := statement.(*ast.LetStatement)
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if !ok {
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l_test.Errorf("statement not *ast.LetStatement, got=%T", statement)
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return false
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}
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if let_statement.Name.Value != name {
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l_test.Errorf("let_statement.name.Value not %s, got=%s", name, let_statement.Name.Value)
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return false
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}
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if let_statement.Name.TokenLiteral() != name {
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l_test.Errorf("let_statement.name.TokenLiteral() not %s, got=%s", name, let_statement.Name.TokenLiteral())
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return false
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}
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return true
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}
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