Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/utils/atomic_test.go

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package utils
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAtomicMax_NewAtomicMax(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+	require.NotNil(t, am)
+	require.Equal(t, int64(0), am.val)
+}
+
+func TestAtomicMax_SetToGreater_InitialValue(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+
+	// Should succeed when newValue > current
+	assert.True(t, am.SetToGreater(10))
+	assert.Equal(t, int64(10), am.val)
+}
+
+func TestAtomicMax_SetToGreater_EqualValue(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+	am.val = 10
+
+	// Should succeed when newValue > current
+	assert.True(t, am.SetToGreater(20))
+	assert.Equal(t, int64(20), am.val)
+}
+
+func TestAtomicMax_SetToGreater_GreaterValue(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+	am.val = 10
+
+	// Should fail when newValue < current, keeping the max value
+	assert.False(t, am.SetToGreater(5))
+	assert.Equal(t, int64(10), am.val)
+}
+
+func TestAtomicMax_SetToGreater_NegativeValues(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+	am.val = -5
+
+	assert.True(t, am.SetToGreater(-2))
+	assert.Equal(t, int64(-2), am.val)
+}
+
+func TestAtomicMax_SetToGreater_Concurrent(t *testing.T) {
+	t.Parallel()
+	am := NewAtomicMax()
+	var wg sync.WaitGroup
+
+	// Run 100 goroutines trying to update the value concurrently
+	numGoroutines := 100
+	wg.Add(numGoroutines)
+
+	for i := range numGoroutines {
+		go func(val int64) {
+			defer wg.Done()
+			am.SetToGreater(val)
+		}(int64(i))
+	}
+
+	wg.Wait()
+
+	// The final value should be 99 (the maximum value)
+	assert.Equal(t, int64(99), am.val)
+}