satellite/durability: use fixed number of pieces in integration test

Test was flaky because we asserted if we have 15 classes:

6 email (for each used (!!!) nodes)
6 last_net (for each used (!!!) nodes)
1 wallet
1 country ("HU")
1 empty value

But there was a very low chance to use only 5 nodes, out of the 6 (RS.Success=5, RS.Total=6).

In that specific case, we had only 12 classes, as we didn't see all the used emails, as we iterated over the used nodes only (and one node was not used).

https://github.com/storj/storj/issues/6549

Change-Id: I66882d5fa9b0d5f5b2397ea856494037972d4b81

satellite/durability/observer_integration_test.go

@@ -10,12 +10,10 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"go.uber.org/zap"
 
 	"storj.io/common/storj/location"
 	"storj.io/common/testcontext"
 	"storj.io/storj/private/testplanet"
-	"storj.io/storj/satellite"
 	"storj.io/storj/satellite/durability"
 )
 
@@ -25,12 +23,7 @@ func TestDurabilityIntegration(t *testing.T) {
 		StorageNodeCount: 6,
 		UplinkCount:      1,
 		Reconfigure: testplanet.Reconfigure{
-			Satellite: func(log *zap.Logger, index int, config *satellite.Config) {
-				config.Metainfo.RS.Min = 3
-				config.Metainfo.RS.Repair = 5
-				config.Metainfo.RS.Success = 5
-				config.Metainfo.RS.Total = 6
-			},
+			Satellite: testplanet.ReconfigureRS(3, 5, 6, 6),
 		},
 	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
 
@@ -72,11 +65,11 @@ func TestDurabilityIntegration(t *testing.T) {
 
 		rangedLoopService := planet.Satellites[0].RangedLoop.RangedLoop.Service
 		_, err := rangedLoopService.RunOnce(ctx)
+		require.NoError(t, err)
 
 		require.Len(t, result, 15)
 		// one or two pieces are controlled out of the 5-6 --> 3 or 4 pieces are available without HU nodes
-		require.True(t, result["HU"].Min() > 2)
-		require.True(t, result["HU"].Min() < 5)
-		require.NoError(t, err)
+		require.Equal(t, result["HU"].Min(), 4)
+
 	})
 }