github.com/zebozhuang/go@v0.0.0-20200207033046-f8a98f6f5c5d/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  	"testing"
     9  )
    10  
    11  func nodrune(r rune) *Node {
    12  	v := new(Mpint)
    13  	v.SetInt64(int64(r))
    14  	v.Rune = true
    15  	return nodlit(Val{v})
    16  }
    17  
    18  func nodflt(f float64) *Node {
    19  	v := new(Mpflt)
    20  	v.SetFloat64(f)
    21  	return nodlit(Val{v})
    22  }
    23  
    24  func TestCaseClauseByConstVal(t *testing.T) {
    25  	tests := []struct {
    26  		a, b *Node
    27  	}{
    28  		// CTFLT
    29  		{nodflt(0.1), nodflt(0.2)},
    30  		// CTINT
    31  		{nodintconst(0), nodintconst(1)},
    32  		// CTRUNE
    33  		{nodrune('a'), nodrune('b')},
    34  		// CTSTR
    35  		{nodlit(Val{"ab"}), nodlit(Val{"abc"})},
    36  		{nodlit(Val{"ab"}), nodlit(Val{"xyz"})},
    37  		{nodlit(Val{"abc"}), nodlit(Val{"xyz"})},
    38  	}
    39  	for i, test := range tests {
    40  		a := caseClause{node: nod(OXXX, test.a, nil)}
    41  		b := caseClause{node: nod(OXXX, test.b, nil)}
    42  		s := caseClauseByConstVal{a, b}
    43  		if less := s.Less(0, 1); !less {
    44  			t.Errorf("%d: caseClauseByConstVal(%v, %v) = false", i, test.a, test.b)
    45  		}
    46  		if less := s.Less(1, 0); less {
    47  			t.Errorf("%d: caseClauseByConstVal(%v, %v) = true", i, test.a, test.b)
    48  		}
    49  	}
    50  }