Merge pull request #134 from nineinchnick/custom-converter

Allow to use a custom converter

driver.go

@@ -35,11 +35,12 @@ func (d *mockDriver) Open(dsn string) (driver.Conn, error) {
 	return c, nil
 }
 
-// New creates sqlmock database connection
-// and a mock to manage expectations.
+// New creates sqlmock database connection and a mock to manage expectations.
+// Accepts options, like ValueConverterOption, to use a ValueConverter from
+// a specific driver.
 // Pings db so that all expectations could be
 // asserted.
-func New() (*sql.DB, Sqlmock, error) {
+func New(options ...func(*sqlmock) error) (*sql.DB, Sqlmock, error) {
 	pool.Lock()
 	dsn := fmt.Sprintf("sqlmock_db_%d", pool.counter)
 	pool.counter++
@@ -48,11 +49,13 @@ func New() (*sql.DB, Sqlmock, error) {
 	pool.conns[dsn] = smock
 	pool.Unlock()
 
-	return smock.open()
+	return smock.open(options)
 }
 
-// NewWithDSN creates sqlmock database connection
-// with a specific DSN and a mock to manage expectations.
+// NewWithDSN creates sqlmock database connection with a specific DSN
+// and a mock to manage expectations.
+// Accepts options, like ValueConverterOption, to use a ValueConverter from
+// a specific driver.
 // Pings db so that all expectations could be asserted.
 //
 // This method is introduced because of sql abstraction
@@ -64,7 +67,7 @@ func New() (*sql.DB, Sqlmock, error) {
 //
 // It is not recommended to use this method, unless you
 // really need it and there is no other way around.
-func NewWithDSN(dsn string) (*sql.DB, Sqlmock, error) {
+func NewWithDSN(dsn string, options ...func(*sqlmock) error) (*sql.DB, Sqlmock, error) {
 	pool.Lock()
 	if _, ok := pool.conns[dsn]; ok {
 		pool.Unlock()
@@ -74,5 +77,5 @@ func NewWithDSN(dsn string) (*sql.DB, Sqlmock, error) {
 	pool.conns[dsn] = smock
 	pool.Unlock()
 
-	return smock.open()
+	return smock.open(options)
 }

driver_test.go

@@ -1,6 +1,8 @@
 package sqlmock
 
 import (
+	"database/sql/driver"
+	"errors"
 	"fmt"
 	"testing"
 )
@@ -9,6 +11,12 @@ type void struct{}
 
 func (void) Print(...interface{}) {}
 
+type converter struct{}
+
+func (c *converter) ConvertValue(v interface{}) (driver.Value, error) {
+	return nil, errors.New("converter disabled")
+}
+
 func ExampleNew() {
 	db, mock, err := New()
 	if err != nil {
@@ -90,6 +98,18 @@ func TestTwoOpenConnectionsOnTheSameDSN(t *testing.T) {
 	}
 }
 
+func TestWithOptions(t *testing.T) {
+	c := &converter{}
+	_, mock, err := New(ValueConverterOption(c))
+	if err != nil {
+		t.Errorf("expected no error, but got: %s", err)
+	}
+	smock, _ := mock.(*sqlmock)
+	if smock.converter.(*converter) != c {
+		t.Errorf("expected a custom converter to be set")
+	}
+}
+
 func TestWrongDSN(t *testing.T) {
 	t.Parallel()
 	db, _, _ := New()

expectations.go

@@ -292,6 +292,7 @@ func (e *ExpectedPrepare) WillBeClosed() *ExpectedPrepare {
 func (e *ExpectedPrepare) ExpectQuery() *ExpectedQuery {
 	eq := &ExpectedQuery{}
 	eq.sqlRegex = e.sqlRegex
+	eq.converter = e.mock.converter
 	e.mock.expected = append(e.mock.expected, eq)
 	return eq
 }
@@ -301,6 +302,7 @@ func (e *ExpectedPrepare) ExpectQuery() *ExpectedQuery {
 func (e *ExpectedPrepare) ExpectExec() *ExpectedExec {
 	eq := &ExpectedExec{}
 	eq.sqlRegex = e.sqlRegex
+	eq.converter = e.mock.converter
 	e.mock.expected = append(e.mock.expected, eq)
 	return eq
 }
@@ -325,8 +327,9 @@ func (e *ExpectedPrepare) String() string {
 // adds a query matching logic
 type queryBasedExpectation struct {
 	commonExpectation
-	sqlRegex *regexp.Regexp
-	args     []driver.Value
+	sqlRegex  *regexp.Regexp
+	converter driver.ValueConverter
+	args      []driver.Value
 }
 
 func (e *queryBasedExpectation) attemptMatch(sql string, args []namedValue) (err error) {

expectations_before_go18.go

@@ -35,7 +35,7 @@ func (e *queryBasedExpectation) argsMatches(args []namedValue) error {
 
 		dval := e.args[k]
 		// convert to driver converter
-		darg, err := driver.DefaultParameterConverter.ConvertValue(dval)
+		darg, err := e.converter.ConvertValue(dval)
 		if err != nil {
 			return fmt.Errorf("could not convert %d argument %T - %+v to driver value: %s", k, e.args[k], e.args[k], err)
 		}

expectations_go18.go

@@ -49,7 +49,7 @@ func (e *queryBasedExpectation) argsMatches(args []namedValue) error {
 		}
 
 		// convert to driver converter
-		darg, err := driver.DefaultParameterConverter.ConvertValue(dval)
+		darg, err := e.converter.ConvertValue(dval)
 		if err != nil {
 			return fmt.Errorf("could not convert %d argument %T - %+v to driver value: %s", k, e.args[k], e.args[k], err)
 		}

expectations_go18_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestQueryExpectationNamedArgComparison(t *testing.T) {
-	e := &queryBasedExpectation{}
+	e := &queryBasedExpectation{converter: driver.DefaultParameterConverter}
 	against := []namedValue{{Value: int64(5), Name: "id"}}
 	if err := e.argsMatches(against); err != nil {
 		t.Errorf("arguments should match, since the no expectation was set, but got err: %s", err)

expectations_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestQueryExpectationArgComparison(t *testing.T) {
-	e := &queryBasedExpectation{}
+	e := &queryBasedExpectation{converter: driver.DefaultParameterConverter}
 	against := []namedValue{{Value: int64(5), Ordinal: 1}}
 	if err := e.argsMatches(against); err != nil {
 		t.Errorf("arguments should match, since the no expectation was set, but got err: %s", err)
@@ -67,7 +67,7 @@ func TestQueryExpectationArgComparison(t *testing.T) {
 func TestQueryExpectationArgComparisonBool(t *testing.T) {
 	var e *queryBasedExpectation
 
-	e = &queryBasedExpectation{args: []driver.Value{true}}
+	e = &queryBasedExpectation{args: []driver.Value{true}, converter: driver.DefaultParameterConverter}
 	against := []namedValue{
 		{Value: true, Ordinal: 1},
 	}
@@ -75,7 +75,7 @@ func TestQueryExpectationArgComparisonBool(t *testing.T) {
 		t.Error("arguments should match, since arguments are the same")
 	}
 
-	e = &queryBasedExpectation{args: []driver.Value{false}}
+	e = &queryBasedExpectation{args: []driver.Value{false}, converter: driver.DefaultParameterConverter}
 	against = []namedValue{
 		{Value: false, Ordinal: 1},
 	}
@@ -83,7 +83,7 @@ func TestQueryExpectationArgComparisonBool(t *testing.T) {
 		t.Error("arguments should match, since argument are the same")
 	}
 
-	e = &queryBasedExpectation{args: []driver.Value{true}}
+	e = &queryBasedExpectation{args: []driver.Value{true}, converter: driver.DefaultParameterConverter}
 	against = []namedValue{
 		{Value: false, Ordinal: 1},
 	}
@@ -91,7 +91,7 @@ func TestQueryExpectationArgComparisonBool(t *testing.T) {
 		t.Error("arguments should not match, since argument is different")
 	}
 
-	e = &queryBasedExpectation{args: []driver.Value{false}}
+	e = &queryBasedExpectation{args: []driver.Value{false}, converter: driver.DefaultParameterConverter}
 	against = []namedValue{
 		{Value: true, Ordinal: 1},
 	}

options.go

@@ -0,0 +1,12 @@
+package sqlmock
+
+import "database/sql/driver"
+
+// ValueConverterOption allows to create a sqlmock connection
+// with a custom ValueConverter to support drivers with special data types.
+func ValueConverterOption(converter driver.ValueConverter) func(*sqlmock) error {
+	return func(s *sqlmock) error {
+		s.converter = converter
+		return nil
+	}
+}

rows.go

@@ -81,18 +81,24 @@ func (rs *rowSets) empty() bool {
 // Rows is a mocked collection of rows to
 // return for Query result
 type Rows struct {
-	cols     []string
-	rows     [][]driver.Value
-	pos      int
-	nextErr  map[int]error
-	closeErr error
+	converter driver.ValueConverter
+	cols      []string
+	rows      [][]driver.Value
+	pos       int
+	nextErr   map[int]error
+	closeErr  error
 }
 
 // NewRows allows Rows to be created from a
 // sql driver.Value slice or from the CSV string and
-// to be used as sql driver.Rows
+// to be used as sql driver.Rows.
+// Use Sqlmock.NewRows instead if using a custom converter
 func NewRows(columns []string) *Rows {
-	return &Rows{cols: columns, nextErr: make(map[int]error)}
+	return &Rows{
+		cols:      columns,
+		nextErr:   make(map[int]error),
+		converter: driver.DefaultParameterConverter,
+	}
 }
 
 // CloseError allows to set an error
@@ -129,7 +135,7 @@ func (r *Rows) AddRow(values ...driver.Value) *Rows {
 		// Convert user-friendly values (such as int or driver.Valuer)
 		// to database/sql native value (driver.Value such as int64)
 		var err error
-		v, err = driver.DefaultParameterConverter.ConvertValue(v)
+		v, err = r.converter.ConvertValue(v)
 		if err != nil {
 			panic(fmt.Errorf(
 				"row #%d, column #%d (%q) type %T: %s",

sqlmock.go

@@ -73,22 +73,37 @@ type Sqlmock interface {
 	// in any order. Or otherwise if switched to true, any unmatched
 	// expectations will be expected in order
 	MatchExpectationsInOrder(bool)
+
+	// NewRows allows Rows to be created from a
+	// sql driver.Value slice or from the CSV string and
+	// to be used as sql driver.Rows.
+	NewRows(columns []string) *Rows
 }
 
 type sqlmock struct {
-	ordered bool
-	dsn     string
-	opened  int
-	drv     *mockDriver
+	ordered   bool
+	dsn       string
+	opened    int
+	drv       *mockDriver
+	converter driver.ValueConverter
 
 	expected []expectation
 }
 
-func (c *sqlmock) open() (*sql.DB, Sqlmock, error) {
+func (c *sqlmock) open(options []func(*sqlmock) error) (*sql.DB, Sqlmock, error) {
 	db, err := sql.Open("sqlmock", c.dsn)
 	if err != nil {
 		return db, c, err
 	}
+	for _, option := range options {
+		err := option(c)
+		if err != nil {
+			return db, c, err
+		}
+	}
+	if c.converter == nil {
+		c.converter = driver.DefaultParameterConverter
+	}
 	return db, c, db.Ping()
 }
 
@@ -301,6 +316,7 @@ func (c *sqlmock) ExpectExec(sqlRegexStr string) *ExpectedExec {
 	e := &ExpectedExec{}
 	sqlRegexStr = stripQuery(sqlRegexStr)
 	e.sqlRegex = regexp.MustCompile(sqlRegexStr)
+	e.converter = c.converter
 	c.expected = append(c.expected, e)
 	return e
 }
@@ -463,6 +479,7 @@ func (c *sqlmock) ExpectQuery(sqlRegexStr string) *ExpectedQuery {
 	e := &ExpectedQuery{}
 	sqlRegexStr = stripQuery(sqlRegexStr)
 	e.sqlRegex = regexp.MustCompile(sqlRegexStr)
+	e.converter = c.converter
 	c.expected = append(c.expected, e)
 	return e
 }
@@ -548,3 +565,12 @@ func (c *sqlmock) Rollback() error {
 	expected.Unlock()
 	return expected.err
 }
+
+// NewRows allows Rows to be created from a
+// sql driver.Value slice or from the CSV string and
+// to be used as sql driver.Rows.
+func (c *sqlmock) NewRows(columns []string) *Rows {
+	r := NewRows(columns)
+	r.converter = c.converter
+	return r
+}

sqlmock_go18.go

@@ -111,3 +111,9 @@ func (stmt *statement) QueryContext(ctx context.Context, args []driver.NamedValu
 }
 
 // @TODO maybe add ExpectedBegin.WithOptions(driver.TxOptions)
+
+// CheckNamedValue meets https://golang.org/pkg/database/sql/driver/#NamedValueChecker
+func (c *sqlmock) CheckNamedValue(nv *driver.NamedValue) (err error) {
+	nv.Value, err = c.converter.ConvertValue(nv.Value)
+	return err
+}

sqlmock_test.go

@@ -849,6 +849,32 @@ func TestRollbackThrow(t *testing.T) {
 	// Output:
 }
 
+func TestUnexpectedBegin(t *testing.T) {
+	// Open new mock database
+	db, _, err := New()
+	if err != nil {
+		fmt.Println("error creating mock database")
+		return
+	}
+	if _, err := db.Begin(); err == nil {
+		t.Error("an error was expected when calling begin, but got none")
+	}
+}
+
+func TestUnexpectedExec(t *testing.T) {
+	// Open new mock database
+	db, mock, err := New()
+	if err != nil {
+		fmt.Println("error creating mock database")
+		return
+	}
+	mock.ExpectBegin()
+	db.Begin()
+	if _, err := db.Exec("SELECT 1"); err == nil {
+		t.Error("an error was expected when calling exec, but got none")
+	}
+}
+
 func TestUnexpectedCommit(t *testing.T) {
 	// Open new mock database
 	db, mock, err := New()
@@ -1113,3 +1139,31 @@ func TestExecExpectationErrorDelay(t *testing.T) {
 		t.Errorf("expecting a delay of less than %v before error, actual delay was %v", delay, elapsed)
 	}
 }
+
+func TestOptionsFail(t *testing.T) {
+	t.Parallel()
+	expected := errors.New("failing option")
+	option := func(*sqlmock) error {
+		return expected
+	}
+	db, _, err := New(option)
+	defer db.Close()
+	if err == nil {
+		t.Errorf("missing expecting error '%s' when opening a stub database connection", expected)
+	}
+}
+
+func TestNewRows(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()
+	columns := []string{"col1", "col2"}
+
+	r := mock.NewRows(columns)
+	if len(r.cols) != len(columns) || r.cols[0] != columns[0] || r.cols[1] != columns[1] {
+		t.Errorf("expecting to create a row with columns %v, actual colmns are %v", r.cols, columns)
+	}
+}