go.nanomsg.org/mangos/v3@v3.4.3-0.20240217232803-46464076f1f5/internal/core/pipe_test.go (about)

     1  // Copyright 2019 The Mangos Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use file except in compliance with the License.
     5  // You may obtain a copy of the license at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package core
    16  
    17  import (
    18  	"testing"
    19  )
    20  
    21  // This is an application-wide global ID allocator.  Unfortunately we need
    22  // to have unique pipe IDs globally to permit certain things to work
    23  // correctly.
    24  
    25  func TestPipeAllocatorWrap(t *testing.T) {
    26  	p := &pipeIDAllocator{}
    27  	_ = p.Get() // as it will reset otherwise
    28  	p.next = 0
    29  	p.next--
    30  	if v := p.Get(); v != 0x7fffffff {
    31  		t.Errorf("Got wrong value for wrap: %x", v)
    32  	}
    33  	// skip zero
    34  	if v := p.Get(); v != 1 {
    35  		t.Errorf("Got wrong value for wrap: %x", v)
    36  	}
    37  }
    38  
    39  func TestPipeAllocatorReuse(t *testing.T) {
    40  	p := &pipeIDAllocator{}
    41  	_ = p.Get() // as it will reset otherwise
    42  	p.next = 0
    43  	p.next--
    44  	if v := p.Get(); v != 0x7fffffff {
    45  		t.Errorf("Got wrong value for wrap: %x", v)
    46  	}
    47  	// skip zero
    48  	if v := p.Get(); v != 1 {
    49  		t.Errorf("Got wrong value for wrap: %x", v)
    50  	}
    51  	p.next = 0
    52  	if v := p.Get(); v != 2 {
    53  		t.Errorf("Maybe reused value?: %x", v)
    54  	}
    55  }
    56  
    57  func TestPipeAllocatorRandom(t *testing.T) {
    58  	p1 := &pipeIDAllocator{}
    59  	p2 := &pipeIDAllocator{}
    60  
    61  	v1 := p1.Get()
    62  	v2 := p2.Get()
    63  
    64  	if v1 == v2 {
    65  		t.Errorf("values not random: %v %v", v1, v2)
    66  	}
    67  }
    68  
    69  func TestPipeAllocatorUnusedFree(t *testing.T) {
    70  	defer func() {
    71  		pass := false
    72  		if r := recover(); r != nil {
    73  			if r != "free of unused pipe ID" {
    74  				t.Errorf("Wrong value for r: %v", r)
    75  			}
    76  			pass = true
    77  		}
    78  		if !pass {
    79  			t.Error("Unused free did not panic")
    80  		}
    81  	}()
    82  
    83  	p := &pipeIDAllocator{}
    84  	p.Free(2)
    85  }
    86  
    87  func TestPipeNoAddress(t *testing.T) {
    88  	p := &pipe{}
    89  	if addr := p.Address(); addr != "" {
    90  		t.Errorf("Got unexpected address: %v", addr)
    91  	}
    92  }