Fix a bunch of FIXMEs

util/lookup_cache_test.go

@@ -0,0 +1,63 @@
+package util
+
+import (
+	"errors"
+	"github.com/stretchr/testify/require"
+	"testing"
+	"time"
+)
+
+func TestLookupCache_Success(t *testing.T) {
+	values, i := []string{"first", "second"}, 0
+	c := NewLookupCache[string](func() (string, error) {
+		time.Sleep(300 * time.Millisecond)
+		v := values[i]
+		i++
+		return v, nil
+	}, 500*time.Millisecond)
+
+	start := time.Now()
+	v, err := c.Value()
+	require.Nil(t, err)
+	require.Equal(t, values[0], v)
+	require.True(t, time.Since(start) >= 300*time.Millisecond)
+
+	start = time.Now()
+	v, err = c.Value()
+	require.Nil(t, err)
+	require.Equal(t, values[0], v)
+	require.True(t, time.Since(start) < 200*time.Millisecond)
+
+	time.Sleep(550 * time.Millisecond)
+
+	start = time.Now()
+	v, err = c.Value()
+	require.Nil(t, err)
+	require.Equal(t, values[1], v)
+	require.True(t, time.Since(start) >= 300*time.Millisecond)
+
+	start = time.Now()
+	v, err = c.Value()
+	require.Nil(t, err)
+	require.Equal(t, values[1], v)
+	require.True(t, time.Since(start) < 200*time.Millisecond)
+}
+
+func TestLookupCache_Error(t *testing.T) {
+	c := NewLookupCache[string](func() (string, error) {
+		time.Sleep(200 * time.Millisecond)
+		return "", errors.New("some error")
+	}, 500*time.Millisecond)
+
+	start := time.Now()
+	v, err := c.Value()
+	require.NotNil(t, err)
+	require.Equal(t, "", v)
+	require.True(t, time.Since(start) >= 200*time.Millisecond)
+
+	start = time.Now()
+	v, err = c.Value()
+	require.NotNil(t, err)
+	require.Equal(t, "", v)
+	require.True(t, time.Since(start) >= 200*time.Millisecond)
+}