text: // Copyright 2015 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package precis
  
  import (
  	"testing"
  
  	"golang.org/x/text/runes"
  )
  
  // Compile-time regression test to ensure that Class is a Set
  var _ runes.Set = (*class)(nil)
  
  // Ensure that certain characters are (or are not) in the identifer class.
  func TestClassContains(t *testing.T) {
  	tests := []struct {
  		name       string
  		class      *class
  		allowed    []rune
  		disallowed []rune
  	}{
  		{
  			name:       "Identifier",
  			class:      identifier,
  			allowed:    []rune("Aa0\u0021\u007e\u00df\u3007"),
  			disallowed: []rune("\u2150\u2100\u2200\u3164\u2190\u2600\u303b\u1e9b"),
  		},
  		{
  			name:       "Freeform",
  			class:      freeform,
  			allowed:    []rune("Aa0\u0021\u007e\u00df\u3007 \u2150\u2100\u2200\u2190\u2600\u1e9b"),
  			disallowed: []rune("\u3164\u303b"),
  		},
  	}
  
  	for _, rt := range tests {
  		for _, r := range rt.allowed {
  			if !rt.class.Contains(r) {
  				t.Errorf("Class %s should contain %U", rt.name, r)
  			}
  		}
  		for _, r := range rt.disallowed {
  			if rt.class.Contains(r) {
  				t.Errorf("Class %s should not contain %U", rt.name, r)
  			}
  		}
  	}
  }
  