chan_test.go

     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  // chan.go tests chan operations.
     6  package main
     7  
     8  import "testing"
     9  
    10  //go:noinline
    11  func lenChan_ssa(v chan int) int {
    12  	return len(v)
    13  }
    14  
    15  //go:noinline
    16  func capChan_ssa(v chan int) int {
    17  	return cap(v)
    18  }
    19  
    20  func testLenChan(t *testing.T) {
    21  
    22  	v := make(chan int, 10)
    23  	v <- 1
    24  	v <- 1
    25  	v <- 1
    26  
    27  	if want, got := 3, lenChan_ssa(v); got != want {
    28  		t.Errorf("expected len(chan) = %d, got %d", want, got)
    29  	}
    30  }
    31  
    32  func testLenNilChan(t *testing.T) {
    33  
    34  	var v chan int
    35  	if want, got := 0, lenChan_ssa(v); got != want {
    36  		t.Errorf("expected len(nil) = %d, got %d", want, got)
    37  	}
    38  }
    39  
    40  func testCapChan(t *testing.T) {
    41  
    42  	v := make(chan int, 25)
    43  
    44  	if want, got := 25, capChan_ssa(v); got != want {
    45  		t.Errorf("expected cap(chan) = %d, got %d", want, got)
    46  	}
    47  }
    48  
    49  func testCapNilChan(t *testing.T) {
    50  
    51  	var v chan int
    52  	if want, got := 0, capChan_ssa(v); got != want {
    53  		t.Errorf("expected cap(nil) = %d, got %d", want, got)
    54  	}
    55  }
    56  
    57  func TestChan(t *testing.T) {
    58  	testLenChan(t)
    59  	testLenNilChan(t)
    60  
    61  	testCapChan(t)
    62  	testCapNilChan(t)
    63  }
    64
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