add provider test with a nested list in a set

in some cases helper/schema misses the list counts.

builtin/providers/test/resource_nested_set.go

@@ -89,6 +89,27 @@ func testResourceNestedSet() *schema.Resource {
 					},
 				},
 			},
+			"with_list": {
+				Type:     schema.TypeSet,
+				Optional: true,
+				Computed: true,
+				Elem: &schema.Resource{
+					Schema: map[string]*schema.Schema{
+						"required": {
+							Type:     schema.TypeString,
+							Required: true,
+						},
+
+						"list": {
+							Type:     schema.TypeList,
+							Optional: true,
+							Elem: &schema.Schema{
+								Type: schema.TypeString,
+							},
+						},
+					},
+				},
+			},
 		},
 	}
 }

builtin/providers/test/resource_nested_set_test.go

@@ -305,3 +305,37 @@ resource "test_resource_nested_set" "foo" {
 		},
 	})
 }
+
+func TestResourceNestedSet_setWithList(t *testing.T) {
+	checkFunc := func(s *terraform.State) error {
+		return nil
+	}
+	resource.UnitTest(t, resource.TestCase{
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckResourceDestroy,
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: strings.TrimSpace(`
+resource "test_resource_nested_set" "foo" {
+	with_list {
+		required = "bar"
+		list = ["initial value"]
+	}
+}
+				`),
+				Check: checkFunc,
+			},
+			resource.TestStep{
+				Config: strings.TrimSpace(`
+resource "test_resource_nested_set" "foo" {
+	with_list {
+		required = "bar"
+		list = ["second value"]
+	}
+}
+				`),
+				Check: checkFunc,
+			},
+		},
+	})
+}