Added a test case

Author: maximmasiutin

mysql/resource_grant_test.go

@@ -1246,3 +1246,63 @@ func TestDisallowDuplicateUsersSameTable(t *testing.T) {
 		},
 	})
 }
+
+func TestModifyPrivileges(t *testing.T) {
+	dbName := fmt.Sprintf("tf-test-%d", rand.Intn(100))
+	onePrivilege = "SELECT"
+	twoPrivileges := `"SELECT", "SHOW_ROUTINE"`
+
+	onePrivilegeConfig := getGrantsSampleWithPrivileges(dbName, onePrivilege)
+	twoPrivilegesConfig := getGrantsSampleWithPrivileges(dbName, twoPrivileges)
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:          func() { testAccPreCheck(t); testAccPreCheckSkipRds(t) },
+		ProviderFactories: testAccProviderFactories,
+		CheckDestroy:      testAccGrantCheckDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccGrantConfigNoGrant(dbName),
+				Check: resource.ComposeTestCheckFunc(
+					prepareTable(dbName, "table1"),
+				),
+			},
+			{
+				Config: onePrivilegeConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testAccPrivilege("mysql_grant.grant", "SELECT", true, false),
+					testAccPrivilege("mysql_grant.grant", "SHOW_ROUTINE", false, false),
+				),
+			},
+			{
+				Config:             twoPrivilegesConfig,
+				RefreshState:       true,
+				ExpectNonEmptyPlan: true,
+				Check: resource.ComposeTestCheckFunc(
+					testAccPrivilege("mysql_grant.grant", "SELECT", true, false),
+					testAccPrivilege("mysql_grant.grant", "SHOW_ROUTINE", true, false),
+				),
+			},
+		},
+	})
+}
+
+func getGrantsSampleWithPrivileges(dbName string, privileges string) string {
+	return fmt.Sprintf(`
+	resource "mysql_database" "test" {
+	  name = "%s"
+	}
+
+	resource "mysql_user" "test" {
+	  user     = "jdoe-%s"
+	  host     = "example.com"
+	}
+
+	resource "mysql_grant" "grant" {
+	  user       = "${mysql_user.test.user}"
+	  host       = "${mysql_user.test.host}"
+	  database   = "${mysql_database.test.name}"
+	  table      = "table1"
+	  privileges = [%s]
+	}
+	`, dbName, dbName, privileges)
+}