gitee.com/go-spring2/spring-base@v1.1.3/atomic/float64_test.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package atomic_test
    18  
    19  import (
    20  	"testing"
    21  	"unsafe"
    22  
    23  	"gitee.com/go-spring2/spring-base/assert"
    24  	"gitee.com/go-spring2/spring-base/atomic"
    25  	"gitee.com/go-spring2/spring-base/json"
    26  )
    27  
    28  func TestFloat64(t *testing.T) {
    29  
    30  	// atomic.Float64 and uint64 occupy the same space
    31  	assert.Equal(t, unsafe.Sizeof(atomic.Float64{}), uintptr(8))
    32  
    33  	var f atomic.Float64
    34  	assert.Equal(t, f.Load(), float64(0))
    35  
    36  	v := f.Add(0.5)
    37  	assert.Equal(t, v, 0.5)
    38  	assert.Equal(t, f.Load(), 0.5)
    39  
    40  	f.Store(1)
    41  	assert.Equal(t, f.Load(), float64(1))
    42  
    43  	old := f.Swap(2)
    44  	assert.Equal(t, old, float64(1))
    45  	assert.Equal(t, f.Load(), float64(2))
    46  
    47  	swapped := f.CompareAndSwap(2, 3)
    48  	assert.True(t, swapped)
    49  	assert.Equal(t, f.Load(), float64(3))
    50  
    51  	swapped = f.CompareAndSwap(2, 3)
    52  	assert.False(t, swapped)
    53  	assert.Equal(t, f.Load(), float64(3))
    54  
    55  	bytes, _ := json.Marshal(&f)
    56  	assert.Equal(t, string(bytes), "3")
    57  }