test: add description in the uninstall checks of 2e2 tests

This patch adds the name of the remaining resources, when the post
uninstall checks fail because of the presence of resources managed by
Liqo after Liqo is actually uninstalled.

test/e2e/postuninstall/basic_test.go

@@ -17,6 +17,7 @@ package postuninstall
 import (
 	"context"
 	"fmt"
+	"strings"
 	"testing"
 	"time"
 
@@ -128,7 +129,11 @@ func NoLiqoNodes(ctx context.Context, clientset *kubernetes.Clientset) error {
 		return err
 	}
 	if len(nodes.Items) > 0 {
-		return fmt.Errorf("There are still virtual nodes in the cluster")
+		nodesNames := make([]string, 0, len(nodes.Items))
+		for i := range nodes.Items {
+			nodesNames = append(nodesNames, nodes.Items[i].Name)
+		}
+		return fmt.Errorf("There are still the virtual nodes %q in the cluster", strings.Join(nodesNames, ", "))
 	}
 	return nil
 }
@@ -140,7 +145,11 @@ func NoRoles(ctx context.Context, cl client.Client, namespaces []string, lSelect
 			return err
 		}
 		if len(roles) > 0 {
-			return fmt.Errorf("There are still roles in namespace %s matching the selector", namespace)
+			rolesNames := make([]string, 0, len(roles))
+			for i := range roles {
+				rolesNames = append(rolesNames, roles[i].Name)
+			}
+			return fmt.Errorf("There are still the roles %q in namespace %s matching the selector", strings.Join(rolesNames, ", "), namespace)
 		}
 	}
 	return nil
@@ -153,7 +162,11 @@ func NoRoleBindings(ctx context.Context, cl client.Client, namespaces []string,
 			return err
 		}
 		if len(roleBindings) > 0 {
-			return fmt.Errorf("There are still rolebindings in namespace %s matching the selector", namespace)
+			roleBindingNames := make([]string, 0, len(roleBindings))
+			for i := range roleBindings {
+				roleBindingNames = append(roleBindingNames, roleBindings[i].Name)
+			}
+			return fmt.Errorf("There are still the rolebindings %q in namespace %s matching the selector", strings.Join(roleBindingNames, ", "), namespace)
 		}
 	}
 	return nil
@@ -165,7 +178,11 @@ func NoClusterRoles(ctx context.Context, cl client.Client, lSelector labels.Sele
 		return err
 	}
 	if len(clusterRoles) > 0 {
-		return fmt.Errorf("There are still clusterroles in the cluster matching the selector")
+		clusterRolesNames := make([]string, 0, len(clusterRoles))
+		for i := range clusterRoles {
+			clusterRolesNames = append(clusterRolesNames, clusterRoles[i].Name)
+		}
+		return fmt.Errorf("There are still the clusterroles %q in the cluster matching the selector", strings.Join(clusterRolesNames, ", "))
 	}
 	return nil
 }
@@ -176,7 +193,12 @@ func NoClusterRoleBindings(ctx context.Context, cl client.Client, lSelector labe
 		return err
 	}
 	if len(clusterRoleBindings) > 0 {
-		return fmt.Errorf("There are still clusterrolebindings in the cluster matching the selector")
+		clusterRoleBindingsNames := make([]string, 0, len(clusterRoleBindings))
+		for i := range clusterRoleBindings {
+			clusterRoleBindingsNames = append(clusterRoleBindingsNames, clusterRoleBindings[i].Name)
+		}
+		return fmt.Errorf("There are still the clusterrolebindings %q in the cluster matching the selector",
+			strings.Join(clusterRoleBindingsNames, ", "))
 	}
 	return nil
 }