token_test.go

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file checks invariants of token.Token ordering that we rely on
     6  // since package go/token doesn't provide any guarantees at the moment.
     7  
     8  package types
     9  
    10  import (
    11  	"go/token"
    12  	"testing"
    13  )
    14  
    15  var assignOps = map[token.Token]token.Token{
    16  	token.ADD_ASSIGN:     token.ADD,
    17  	token.SUB_ASSIGN:     token.SUB,
    18  	token.MUL_ASSIGN:     token.MUL,
    19  	token.QUO_ASSIGN:     token.QUO,
    20  	token.REM_ASSIGN:     token.REM,
    21  	token.AND_ASSIGN:     token.AND,
    22  	token.OR_ASSIGN:      token.OR,
    23  	token.XOR_ASSIGN:     token.XOR,
    24  	token.SHL_ASSIGN:     token.SHL,
    25  	token.SHR_ASSIGN:     token.SHR,
    26  	token.AND_NOT_ASSIGN: token.AND_NOT,
    27  }
    28  
    29  func TestZeroTok(t *testing.T) {
    30  	// zero value for token.Token must be token.ILLEGAL
    31  	var zero token.Token
    32  	if token.ILLEGAL != zero {
    33  		t.Errorf("%s == %d; want 0", token.ILLEGAL, zero)
    34  	}
    35  }
    36  
    37  func TestAssignOp(t *testing.T) {
    38  	// there are fewer than 256 tokens
    39  	for i := 0; i < 256; i++ {
    40  		tok := token.Token(i)
    41  		got := assignOp(tok)
    42  		want := assignOps[tok]
    43  		if got != want {
    44  			t.Errorf("for assignOp(%s): got %s; want %s", tok, got, want)
    45  		}
    46  	}
    47  }
    48
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