func Test_ShouldReturnNilJustEOF(t *testing.T) {
_, ch := lex.NewLexer("")
p := NewParser(ch)
if tree := p.Parse(); tree != nil {
t.Errorf("Parse on empty string should only return nil, got %v instead", tree)
}
}
func Test_IntegerShouldReturnIntegerLiterals(t *testing.T) {
_, ch := lex.NewLexer("123")
p := NewParser(ch)
if tree := p.Parse(); tree.Eval() != 123 {
t.Errorf("Parse Expected to produce %v, got %v", 123, tree.Eval())
}
}