fix test

Signed-off-by: SungJin1212 <tjdwls1201@gmail.com>

Author: SungJin1212

pkg/cortexpb/timeseriesv2_test.go

@@ -63,25 +63,23 @@ func TestReuseWriteRequestV2(t *testing.T) {
 	tsSlice = append(tsSlice, PreallocTimeseriesV2{TimeSeriesV2: TimeseriesV2FromPool()})
 	req.Timeseries = tsSlice
 
+	symbolsBackingArray := req.Symbols[:cap(req.Symbols)]
+	require.Equal(t, "__name__", symbolsBackingArray[1])
+	require.Equal(t, "test", symbolsBackingArray[2])
+
 	// Put the request back into the pool
 	ReuseWriteRequestV2(req)
 
-	// Retrieve it from the pool again
-	reused := PreallocWriteRequestV2FromPool()
+	for i, s := range symbolsBackingArray[:3] {
+		assert.Equalf(t, "", s, "symbol at index %d not cleared", i)
+	}
 
 	// Source is reset to default
-	assert.Equal(t, API, reused.Source)
+	assert.Equal(t, API, req.Source)
 	// The symbol length is properly reset to 0.
-	assert.Len(t, reused.Symbols, 0)
+	assert.Len(t, req.Symbols, 0)
 	// Timeseries slice is nil
-	assert.Nil(t, reused.Timeseries)
-
-	// The underlying array's string pointers are cleared to "" to prevent memory leak.
-	if cap(reused.Symbols) > 0 {
-		underlyingArray := reused.Symbols[:cap(reused.Symbols)]
-		assert.Equal(t, "", underlyingArray[0])
-		assert.Equal(t, "", underlyingArray[1])
-	}
+	assert.Nil(t, req.Timeseries)
 }
 
 func BenchmarkMarshallWriteRequestV2(b *testing.B) {