refac: migration crash, real-database tests, site deleted during create, ruels out of the repo, lists

test/lock_contention_driver_test.go

@@ -76,3 +76,32 @@ func TestTransactorClassifiesLockContention(t *testing.T) {
 		}
 	})
 }
+
+func TestDriverUniqueViolation(t *testing.T) {
+	cases := []struct {
+		name   string
+		driver string
+		err    error
+		want   bool
+	}{
+		{"sqlite unique index", database.DriverSQLite, codedSQLiteError{2067}, true},
+		{"sqlite primary key", database.DriverSQLite, fmt.Errorf("wrapped: %w", codedSQLiteError{1555}), true},
+		{"sqlite not null", database.DriverSQLite, codedSQLiteError{1299}, false},
+		{"sqlite busy", database.DriverSQLite, codedSQLiteError{5}, false},
+		{"sqlite plain error", database.DriverSQLite, errors.New("UNIQUE constraint failed"), false},
+		{"mysql duplicate entry", database.DriverMySQL, &mysqldriver.MySQLError{Number: 1062}, true},
+		{"mysql duplicate entry with key name", database.DriverMySQL, fmt.Errorf("wrapped: %w", &mysqldriver.MySQLError{Number: 1586}), true},
+		{"mysql deadlock", database.DriverMySQL, &mysqldriver.MySQLError{Number: 1213}, false},
+		{"postgres unique violation", database.DriverPostgres, &pgconn.PgError{Code: "23505"}, true},
+		{"postgres foreign key violation", database.DriverPostgres, &pgconn.PgError{Code: "23503"}, false},
+		{"unknown driver", "oracle", &pgconn.PgError{Code: "23505"}, false},
+		{"nil error", database.DriverPostgres, nil, false},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			if got := database.IsUniqueViolationFor(c.driver, c.err); got != c.want {
+				t.Errorf("got %v, want %v", got, c.want)
+			}
+		})
+	}
+}