github.com/FenixAra/go@v0.0.0-20170127160404-96ea0918e670/src/cmd/compile/internal/gc/swt_test.go (about)

     1  // Copyright 2015 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  package gc
     6  
     7  import (
     8  	"math/big"
     9  	"testing"
    10  )
    11  
    12  func nodrune(r rune) *Node {
    13  	return nodlit(Val{&Mpint{Val: *big.NewInt(int64(r)), Rune: true}})
    14  }
    15  
    16  func nodflt(f float64) *Node {
    17  	return nodlit(Val{&Mpflt{Val: *big.NewFloat(f)}})
    18  }
    19  
    20  func TestCaseClauseByConstVal(t *testing.T) {
    21  	tests := []struct {
    22  		a, b *Node
    23  	}{
    24  		// CTFLT
    25  		{nodflt(0.1), nodflt(0.2)},
    26  		// CTINT
    27  		{nodintconst(0), nodintconst(1)},
    28  		// CTRUNE
    29  		{nodrune('a'), nodrune('b')},
    30  		// CTSTR
    31  		{nodlit(Val{"ab"}), nodlit(Val{"abc"})},
    32  		{nodlit(Val{"ab"}), nodlit(Val{"xyz"})},
    33  		{nodlit(Val{"abc"}), nodlit(Val{"xyz"})},
    34  	}
    35  	for i, test := range tests {
    36  		a := caseClause{node: nod(OXXX, test.a, nil)}
    37  		b := caseClause{node: nod(OXXX, test.b, nil)}
    38  		s := caseClauseByConstVal{a, b}
    39  		if less := s.Less(0, 1); !less {
    40  			t.Errorf("%d: caseClauseByConstVal(%v, %v) = false", i, test.a, test.b)
    41  		}
    42  		if less := s.Less(1, 0); less {
    43  			t.Errorf("%d: caseClauseByConstVal(%v, %v) = true", i, test.a, test.b)
    44  		}
    45  	}
    46  }