pgx driver mock for Golang
pgxmock is a mock library implementing pgx - PostgreSQL Driver and Toolkit.
It's based on the well-known sqlmock library for sql/driver.
pgxmock has one and only purpose - to simulate pgx behavior in tests, without needing a real database connection. It helps to maintain correct TDD workflow.
- written based on go1.21 version;
- does not require any modifications to your source code;
- has strict by default expectation order matching;
- has no third party dependencies except pgx packages.
Install
go get github.com/pashagolub/pgxmock/v4
Documentation and Examples
Visit godoc for general examples and public api reference.
See implementation examples:
Something you may want to test
package main
import (
"context"
pgx "github.com/jackc/pgx/v5"
)
type PgxIface interface {
Begin(context.Context) (pgx.Tx, error)
Close(context.Context) error
}
func recordStats(db PgxIface, userID, productID int) (err error) {
if tx, err := db.Begin(context.Background()); err != nil {
return
}
defer func() {
switch err {
case nil:
err = tx.Commit(context.Background())
default:
_ = tx.Rollback(context.Background())
}
}()
sql := "UPDATE products SET views = views + 1"
if _, err = tx.Exec(context.Background(), sql); err != nil {
return
}
sql = "INSERT INTO product_viewers (user_id, product_id) VALUES ($1, $2)"
if _, err = tx.Exec(context.Background(), sql, userID, productID); err != nil {
return
}
return
}
func main() {
// @NOTE: the real connection is not required for tests
db, err := pgx.Connect(context.Background(), "postgres://rolname@hostname/dbname")
if err != nil {
panic(err)
}
defer db.Close(context.Background())
if err = recordStats(db, 1 /*some user id*/, 5 /*some product id*/); err != nil {
panic(err)
}
}
Tests with pgxmock
package main
import (
"context"
"fmt"
"testing"
"github.com/pashagolub/pgxmock/v4"
)
// a successful case
func TestShouldUpdateStats(t *testing.T) {
mock, err := pgxmock.NewPool()
if err != nil {
t.Fatal(err)
}
defer mock.Close()
mock.ExpectBegin()
mock.ExpectExec("UPDATE products").
WillReturnResult(pgxmock.NewResult("UPDATE", 1))
mock.ExpectExec("INSERT INTO product_viewers").
WithArgs(2, 3).
WillReturnResult(pgxmock.NewResult("INSERT", 1))
mock.ExpectCommit()
// now we execute our method
if err = recordStats(mock, 2, 3); err != nil {
t.Errorf("error was not expected while updating: %s", err)
}
// we make sure that all expectations were met
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled expectations: %s", err)
}
}
// a failing test case
func TestShouldRollbackStatUpdatesOnFailure(t *testing.T) {
mock, err := pgxmock.NewPool()
if err != nil {
t.Fatal(err)
}
defer mock.Close()
mock.ExpectBegin()
mock.ExpectExec("UPDATE products").
WillReturnResult(pgxmock.NewResult("UPDATE", 1))
mock.ExpectExec("INSERT INTO product_viewers").
WithArgs(2, 3).
WillReturnError(fmt.Errorf("some error"))
mock.ExpectRollback()
// now we execute our method
if err = recordStats(mock, 2, 3); err == nil {
t.Errorf("was expecting an error, but there was none")
}
// we make sure that all expectations were met
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled expectations: %s", err)
}
}
Customize SQL query matching
There were plenty of requests from users regarding SQL query string validation or different matching option.
We have now implemented the QueryMatcher interface, which can be passed through an option when calling
pgxmock.New or pgxmock.NewWithDSN.
This now allows to include some library, which would allow for example to parse and validate SQL AST.
And create a custom QueryMatcher in order to validate SQL in sophisticated ways.
By default, pgxmock is preserving backward compatibility and default query matcher is pgxmock.QueryMatcherRegexp
which uses expected SQL string as a regular expression to match incoming query string. There is an equality matcher:
QueryMatcherEqual which will do a full case sensitive match.
In order to customize the QueryMatcher, use the following:
mock, err := pgxmock.New(context.Background(), pgxmock.QueryMatcherOption(pgxmock.QueryMatcherEqual))
The query matcher can be fully customized based on user needs. pgxmock will not
provide a standard sql parsing matchers.
Matching arguments like time.Time
There may be arguments which are of struct type and cannot be compared easily by value like time.Time. In this case
pgxmock provides an Argument interface which
can be used in more sophisticated matching. Here is a simple example of time argument matching:
type AnyTime struct{}
// Match satisfies sqlmock.Argument interface
func (a AnyTime) Match(v interface{}) bool {
_, ok := v.(time.Time)
return ok
}
func TestAnyTimeArgument(t *testing.T) {
t.Parallel()
db, mock, err := New()
if err != nil {
t.Errorf("an error '%s' was not expected when opening a stub database connection", err)
}
defer db.Close()
mock.ExpectExec("INSERT INTO users").
WithArgs("john", AnyTime{}).
WillReturnResult(NewResult(1, 1))
_, err = db.Exec("INSERT INTO users(name, created_at) VALUES (?, ?)", "john", time.Now())
if err != nil {
t.Errorf("error '%s' was not expected, while inserting a row", err)
}
if err := mock.ExpectationsWereMet(); err != nil {
t.Errorf("there were unfulfilled expectations: %s", err)
}
}
It only asserts that argument is of time.Time type.
Run tests
go test -race
Contributions
Feel free to open a pull request. Note, if you wish to contribute an extension to public (exported methods or types) -
please open an issue before, to discuss whether these changes can be accepted. All backward incompatible changes are
and will be treated cautiously