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Test com.Atomic #35

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115 changes: 115 additions & 0 deletions com/atomic_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,115 @@
package com

import (
"github.com/stretchr/testify/require"
"testing"
)

type testInterface interface {
DoNothing()
}

type testImpl struct {
i int
}

func (*testImpl) DoNothing() {}

func TestAtomic_Load(t *testing.T) {
subtests := []struct {
name string
init bool
io testInterface
}{
{"uninitialized", false, nil},
{"nil", true, nil},
{"nilptr", true, (*testImpl)(nil)},
{"zero", true, &testImpl{}},
{"nonzero", true, &testImpl{42}},
}

for _, st := range subtests {
t.Run(st.name, func(t *testing.T) {
var a Atomic[testInterface]
if st.init {
a.Store(st.io)
}

v, ok := a.Load()
require.Equal(t, st.init, ok)
require.Equal(t, st.io, v)
})
}
}

func TestAtomic_Swap(t *testing.T) {
subtests := []struct {
name string
init bool
io testInterface
new testInterface
}{
{"uninitialized", false, nil, (*testImpl)(nil)},
{"nil", true, (*testImpl)(nil), nil},
}

for _, st := range subtests {
t.Run(st.name, func(t *testing.T) {
var a Atomic[testInterface]
if st.init {
a.Store(st.io)
}

old, ok := a.Swap(st.new)
require.Equal(t, st.init, ok, "Swap second return value")
require.Equal(t, st.io, old, "Swap first return value")

v, ok := a.Load()
require.True(t, ok, "Load second return value")
require.Equal(t, st.new, v, "Load first return value")
})
}
}

func TestAtomic_CompareAndSwap(t *testing.T) {
subtests := []struct {
name string
init bool
io testInterface
old testInterface
new testInterface
swapped bool
}{
{"uninitialized_nil_nonzero", false, nil, nil, &testImpl{}, false},
{"uninitialized_nilptr_nonzero", false, nil, (*testImpl)(nil), &testImpl{}, false},
{"uninitialized_nonzero_nilptr", false, nil, &testImpl{}, (*testImpl)(nil), false},
{"nil_nil_nonzero", true, nil, nil, &testImpl{}, true},
{"nil_nilptr_nonzero", true, nil, (*testImpl)(nil), &testImpl{}, false},
{"nil_nonzero_nilptr", true, nil, &testImpl{}, (*testImpl)(nil), false},
{"nilptr_nil_nonzero", true, (*testImpl)(nil), nil, &testImpl{}, false},
{"nilptr_nilptr_nonzero", true, (*testImpl)(nil), (*testImpl)(nil), &testImpl{}, true},
{"nilptr_nonzero_nil", true, (*testImpl)(nil), &testImpl{}, nil, false},
{"nonzero_nil_nilptr", true, &testImpl{}, nil, (*testImpl)(nil), false},
{"nonzero_nilptr_nil", true, &testImpl{}, (*testImpl)(nil), nil, false},
{"nonzero_nonzero_nilptr", true, &testImpl{}, &testImpl{}, (*testImpl)(nil), false},
}

for _, st := range subtests {
t.Run(st.name, func(t *testing.T) {
var a Atomic[testInterface]
if st.init {
a.Store(st.io)
}

require.Equal(t, st.swapped, a.CompareAndSwap(st.old, st.new), "CompareAndSwap return value")

if v, ok := a.Load(); st.swapped {
require.True(t, ok, "Load second return value")
require.Equal(t, st.new, v, "Load first return value")
} else {
require.Equal(t, st.init, ok, "Load second return value")
require.Equal(t, st.io, v, "Load first return value")
}
})
}
}
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