Use memdb for tests. (#131)

driver/driver_test.go

@@ -7,7 +7,6 @@ import (
 	"errors"
 	"math"
 	"net/url"
-	"path/filepath"
 	"testing"
 	"time"
 
@@ -15,7 +14,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/internal/util"
-	"github.com/ncruces/go-sqlite3/vfs"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Test_Open_dir(t *testing.T) {
@@ -38,8 +37,11 @@ func Test_Open_dir(t *testing.T) {
 
 func Test_Open_pragma(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_pragma": {"busy_timeout(1000)"},
+	})
 
-	db, err := sql.Open("sqlite3", "file::memory:?_pragma=busy_timeout(1000)")
+	db, err := sql.Open("sqlite3", tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -57,8 +59,11 @@ func Test_Open_pragma(t *testing.T) {
 
 func Test_Open_pragma_invalid(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_pragma": {"busy_timeout 1000"},
+	})
 
-	db, err := sql.Open("sqlite3", "file::memory:?_pragma=busy_timeout+1000")
+	db, err := sql.Open("sqlite3", tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -81,14 +86,13 @@ func Test_Open_pragma_invalid(t *testing.T) {
 }
 
 func Test_Open_txLock(t *testing.T) {
-	if !vfs.SupportsFileLocking {
-		t.Skip("skipping without locks")
-	}
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_txlock": {"exclusive"},
+		"_pragma": {"busy_timeout(1000)"},
+	})
 
-	db, err := sql.Open("sqlite3", "file:"+
+	db, err := sql.Open("sqlite3", tmp)
-		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db"))+
-		"?_txlock=exclusive&_pragma=busy_timeout(0)")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -119,8 +123,11 @@ func Test_Open_txLock(t *testing.T) {
 
 func Test_Open_txLock_invalid(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_txlock": {"xclusive"},
+	})
 
-	_, err := sql.Open("sqlite3", "file::memory:?_txlock=xclusive")
+	_, err := sql.Open("sqlite3", tmp+"_txlock=xclusive")
 	if err == nil {
 		t.Fatal("want error")
 	}
@@ -130,17 +137,16 @@ func Test_Open_txLock_invalid(t *testing.T) {
 }
 
 func Test_BeginTx(t *testing.T) {
-	if !vfs.SupportsFileLocking {
-		t.Skip("skipping without locks")
-	}
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_txlock": {"exclusive"},
+		"_pragma": {"busy_timeout(0)"},
+	})
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := sql.Open("sqlite3", "file:"+
+	db, err := sql.Open("sqlite3", tmp)
-		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db"))+
-		"?_txlock=exclusive&_pragma=busy_timeout(0)")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -182,8 +188,9 @@ func Test_BeginTx(t *testing.T) {
 
 func Test_Prepare(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := sql.Open("sqlite3", ":memory:")
+	db, err := sql.Open("sqlite3", tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -222,11 +229,12 @@ func Test_Prepare(t *testing.T) {
 
 func Test_QueryRow_named(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := sql.Open("sqlite3", ":memory:")
+	db, err := sql.Open("sqlite3", tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -274,8 +282,9 @@ func Test_QueryRow_named(t *testing.T) {
 
 func Test_QueryRow_blob_null(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := sql.Open("sqlite3", ":memory:")
+	db, err := sql.Open("sqlite3", tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -310,7 +319,11 @@ func Test_time(t *testing.T) {
 
 	for _, fmt := range []string{"auto", "sqlite", "rfc3339", time.ANSIC} {
 		t.Run(fmt, func(t *testing.T) {
-			db, err := sql.Open("sqlite3", "file::memory:?_timefmt="+url.QueryEscape(fmt))
+			tmp := memdb.TestDB(t, url.Values{
+				"_timefmt": {fmt},
+			})
+
+			db, err := sql.Open("sqlite3", tmp)
 			if err != nil {
 				t.Fatal(err)
 			}

ext/array/array_test.go

@@ -12,10 +12,11 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/array"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Example_driver() {
-	db, err := driver.Open(":memory:", array.Register)
+	db, err := driver.Open("file:/test.db?vfs=memdb", array.Register)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -87,8 +88,9 @@ func Example() {
 
 func Test_cursor_Column(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", array.Register)
+	db, err := driver.Open(tmp, array.Register)
 	if err != nil {
 		t.Fatal(err)
 	}

ext/fileio/fileio_test.go

@@ -12,12 +12,14 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/fileio"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Test_lsmode(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", fileio.Register)
+	db, err := driver.Open(tmp, fileio.Register)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -51,7 +53,9 @@ func Test_readfile(t *testing.T) {
 
 	for _, fsys := range []fs.FS{nil, os.DirFS(".")} {
 		t.Run("", func(t *testing.T) {
-			db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+			tmp := memdb.TestDB(t)
+
+			db, err := driver.Open(tmp, func(c *sqlite3.Conn) error {
 				fileio.RegisterFS(c, fsys)
 				return nil
 			})

ext/fileio/fsdir_test.go

@@ -13,6 +13,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/fileio"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Test_fsdir(t *testing.T) {
@@ -20,7 +21,9 @@ func Test_fsdir(t *testing.T) {
 
 	for _, fsys := range []fs.FS{nil, os.DirFS(".")} {
 		t.Run("", func(t *testing.T) {
-			db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+			tmp := memdb.TestDB(t)
+
+			db, err := driver.Open(tmp, func(c *sqlite3.Conn) error {
 				fileio.RegisterFS(c, fsys)
 				return nil
 			})

ext/fileio/write_test.go

@@ -10,12 +10,14 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Test_writefile(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}

ext/hash/hash_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 	_ "golang.org/x/crypto/blake2b"
 	_ "golang.org/x/crypto/blake2s"
 	_ "golang.org/x/crypto/md4"
@@ -19,6 +20,7 @@ import (
 
 func TestRegister(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
 	tests := []struct {
 		name string
@@ -52,7 +54,7 @@ func TestRegister(t *testing.T) {
 		{"blake2b('', 256)", "0E5751C026E543B2E8AB2EB06099DAA1D1E5DF47778F7787FAAB45CDF12FE3A8"},
 	}
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}

ext/lines/lines_test.go

@@ -15,10 +15,11 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/lines"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Example() {
-	db, err := driver.Open(":memory:", lines.Register)
+	db, err := driver.Open("file:/test.db?vfs=memdb", lines.Register)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -66,8 +67,9 @@ func Example() {
 
 func Test_lines(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", lines.Register)
+	db, err := driver.Open(tmp, lines.Register)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -96,8 +98,9 @@ func Test_lines(t *testing.T) {
 
 func Test_lines_error(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", lines.Register)
+	db, err := driver.Open(tmp, lines.Register)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -120,8 +123,9 @@ func Test_lines_error(t *testing.T) {
 
 func Test_lines_read(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", lines.Register)
+	db, err := driver.Open(tmp, lines.Register)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -151,8 +155,9 @@ func Test_lines_read(t *testing.T) {
 
 func Test_lines_test(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", lines.Register)
+	db, err := driver.Open(tmp, lines.Register)
 	if err != nil {
 		log.Fatal(err)
 	}

ext/regexp/regexp_test.go

@@ -6,12 +6,14 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestRegister(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -45,8 +47,9 @@ func TestRegister(t *testing.T) {
 
 func TestRegister_errors(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}

ext/uuid/uuid_test.go

@@ -7,12 +7,14 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Test_generate(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -130,8 +132,9 @@ func Test_generate(t *testing.T) {
 
 func Test_convert(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", Register)
+	db, err := driver.Open(tmp, Register)
 	if err != nil {
 		t.Fatal(err)
 	}

ext/zorder/zorder_test.go

@@ -9,12 +9,14 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/zorder"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestRegister_zorder(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", zorder.Register)
+	db, err := driver.Open(tmp, zorder.Register)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -57,8 +59,9 @@ func TestRegister_zorder(t *testing.T) {
 
 func TestRegister_unzorder(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", zorder.Register)
+	db, err := driver.Open(tmp, zorder.Register)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -84,8 +87,9 @@ func TestRegister_unzorder(t *testing.T) {
 
 func TestRegister_error(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db, err := driver.Open(":memory:", zorder.Register)
+	db, err := driver.Open(tmp, zorder.Register)
 	if err != nil {
 		t.Fatal(err)
 	}

gormlite/sqlite_test.go

@@ -10,14 +10,14 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestDialector(t *testing.T) {
-	// This is the DSN of the in-memory SQLite database for these tests.
+	tmp := memdb.TestDB(t)
-	const InMemoryDSN = "file:testdatabase?mode=memory&cache=shared"
 
 	// Custom connection with a custom function called "my_custom_function".
-	db, err := driver.Open(InMemoryDSN, func(conn *sqlite3.Conn) error {
+	db, err := driver.Open(tmp, func(conn *sqlite3.Conn) error {
 		return conn.CreateFunction("my_custom_function", 0, sqlite3.DETERMINISTIC,
 			func(ctx sqlite3.Context, arg ...sqlite3.Value) {
 				ctx.ResultText("my-result")
@@ -36,14 +36,14 @@ func TestDialector(t *testing.T) {
 	}{
 		{
 			description:  "Default driver",
-			dialector:    Open(InMemoryDSN),
+			dialector:    Open(tmp),
 			openSuccess:  true,
 			query:        "SELECT 1",
 			querySuccess: true,
 		},
 		{
 			description:  "Custom function",
-			dialector:    Open(InMemoryDSN),
+			dialector:    Open(tmp),
 			openSuccess:  true,
 			query:        "SELECT my_custom_function()",
 			querySuccess: false,

json_test.go

@@ -6,11 +6,10 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func Example_json() {
-	db, err := sqlite3.Open("file:/test.db?vfs=memdb")
+	db, err := sqlite3.Open(":memory:")
 	if err != nil {
 		log.Fatal(err)
 	}

tests/bradfitz/sql_test.go

@@ -45,7 +45,7 @@ func (t params) mustExec(sql string, args ...interface{}) sql.Result {
 
 func (sqliteDB) RunTest(t *testing.T, fn func(params)) {
 	db, err := sql.Open("sqlite3", "file:"+
-		filepath.Join(t.TempDir(), "foo.db")+
+		filepath.ToSlash(filepath.Join(t.TempDir(), "foo.db"))+
 		"?_pragma=busy_timeout(10000)&_pragma=synchronous(off)")
 	if err != nil {
 		t.Fatalf("foo.db open fail: %v", err)

tests/conn_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"math"
+	"net/url"
 	"os"
 	"path/filepath"
 	"strings"
@@ -13,6 +14,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
@@ -727,8 +729,11 @@ func TestConn_DBName(t *testing.T) {
 
 func TestConn_AutoVacuumPages(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t, url.Values{
+		"_pragma": {"auto_vacuum(full)"},
+	})
 
-	db, err := sqlite3.Open("file:test.db?vfs=memdb&_pragma=auto_vacuum(full)")
+	db, err := sqlite3.Open(tmp)
 	if err != nil {
 		t.Fatal(err)
 	}

tests/db_test.go

@@ -12,6 +12,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs"
 	_ "github.com/ncruces/go-sqlite3/vfs/adiantum"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
@@ -65,7 +66,7 @@ func TestDB_utf16(t *testing.T) {
 
 func TestDB_memdb(t *testing.T) {
 	t.Parallel()
-	testDB(t, "file:test.db?vfs=memdb")
+	testDB(t, memdb.TestDB(t))
 }
 
 func TestDB_adiantum(t *testing.T) {

tests/driver_test.go

@@ -8,15 +8,17 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestDriver(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := driver.Open(":memory:", nil, func(c *sqlite3.Conn) error {
+	db, err := driver.Open(tmp, nil, func(c *sqlite3.Conn) error {
 		return c.Exec(`PRAGMA optimize`)
 	})
 	if err != nil {

tests/json_test.go

@@ -11,16 +11,18 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 	"github.com/ncruces/julianday"
 )
 
 func TestJSON(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := driver.Open(":memory:")
+	db, err := driver.Open(tmp)
 	if err != nil {
 		t.Fatal(err)
 	}

tests/parallel/parallel_test.go

@@ -2,6 +2,7 @@ package tests
 
 import (
 	"io"
+	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -31,7 +32,7 @@ func Test_parallel(t *testing.T) {
 	}
 
 	name := "file:" +
-		filepath.Join(t.TempDir(), "test.db") +
+		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db")) +
 		"?_pragma=busy_timeout(10000)" +
 		"&_pragma=journal_mode(truncate)" +
 		"&_pragma=synchronous(off)"
@@ -45,7 +46,7 @@ func Test_wal(t *testing.T) {
 	}
 
 	name := "file:" +
-		filepath.Join(t.TempDir(), "test.db") +
+		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db")) +
 		"?_pragma=busy_timeout(10000)" +
 		"&_pragma=journal_mode(wal)" +
 		"&_pragma=synchronous(off)"
@@ -61,8 +62,9 @@ func Test_memdb(t *testing.T) {
 		iter = 5000
 	}
 
-	memdb.Create("test.db", nil)
+	name := memdb.TestDB(t, url.Values{
-	name := "file:/test.db?vfs=memdb"
+		"_pragma": {"busy_timeout(10000)"},
+	})
 	testParallel(t, name, iter)
 	testIntegrity(t, name)
 }
@@ -82,7 +84,10 @@ func Test_adiantum(t *testing.T) {
 	name := "file:" +
 		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db")) +
 		"?vfs=adiantum" +
-		"&_pragma=hexkey(e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)"
+		"&_pragma=hexkey(e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)" +
+		"&_pragma=busy_timeout(10000)" +
+		"&_pragma=journal_mode(truncate)" +
+		"&_pragma=synchronous(off)"
 	testParallel(t, name, iter)
 	testIntegrity(t, name)
 }
@@ -98,7 +103,7 @@ func TestMultiProcess(t *testing.T) {
 	file := filepath.Join(t.TempDir(), "test.db")
 	t.Setenv("TestMultiProcess_dbfile", file)
 
-	name := "file:" + file +
+	name := "file:" + filepath.ToSlash(file) +
 		"?_pragma=busy_timeout(10000)" +
 		"&_pragma=journal_mode(truncate)" +
 		"&_pragma=synchronous(off)"
@@ -133,7 +138,7 @@ func TestChildProcess(t *testing.T) {
 		t.SkipNow()
 	}
 
-	name := "file:" + file +
+	name := "file:" + filepath.ToSlash(file) +
 		"?_pragma=busy_timeout(10000)" +
 		"&_pragma=journal_mode(truncate)" +
 		"&_pragma=synchronous(off)"
@@ -177,8 +182,9 @@ func Benchmark_memdb(b *testing.B) {
 	sqlite3.Initialize()
 	b.ResetTimer()
 
-	memdb.Create("test.db", nil)
+	name := memdb.TestDB(b, url.Values{
-	name := "file:/test.db?vfs=memdb"
+		"_pragma": {"busy_timeout(10000)"},
+	})
 	testParallel(b, name, b.N)
 }
 
@@ -218,11 +224,6 @@ func testParallel(t testing.TB, name string, n int) {
 		}
 		defer db.Close()
 
-		err = db.BusyTimeout(10 * time.Second)
-		if err != nil {
-			return err
-		}
-
 		stmt, _, err := db.Prepare(`SELECT id, name FROM users`)
 		if err != nil {
 			return err

tests/time_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestTimeFormat_Encode(t *testing.T) {
@@ -132,11 +133,12 @@ func TestTimeFormat_Decode(t *testing.T) {
 
 func TestTimeFormat_Scanner(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := driver.Open(":memory:")
+	db, err := driver.Open(tmp)
 	if err != nil {
 		t.Fatal(err)
 	}

tests/txn_test.go

@@ -8,7 +8,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
-	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
+	"github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
 func TestConn_Transaction_exec(t *testing.T) {
@@ -254,14 +254,15 @@ func TestConn_Transaction_interrupted(t *testing.T) {
 
 func TestConn_Transaction_busy(t *testing.T) {
 	t.Parallel()
+	tmp := memdb.TestDB(t)
 
-	db1, err := sqlite3.Open("file:/test.db?vfs=memdb")
+	db1, err := sqlite3.Open(tmp)
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer db1.Close()
 
-	db2, err := sqlite3.Open("file:/test.db?vfs=memdb&_pragma=busy_timeout(10000)")
+	db2, err := sqlite3.Open(tmp + "&_pragma=busy_timeout(10000)")
 	if err != nil {
 		t.Fatal(err)
 	}

vfs/memdb/api.go

@@ -10,7 +10,10 @@
 package memdb
 
 import (
+	"fmt"
+	"net/url"
 	"sync"
+	"testing"
 
 	"github.com/ncruces/go-sqlite3/vfs"
 )
@@ -66,3 +69,30 @@ func Delete(name string) {
 	defer memoryMtx.Unlock()
 	delete(memoryDBs, name)
 }
+
+// TestDB creates an empty shared memory database for the test to use.
+// The database is automatically deleted when the test and all its subtests complete.
+// Each subsequent call to TestDB returns a unique database.
+func TestDB(tb testing.TB, params ...url.Values) string {
+	tb.Helper()
+
+	name := fmt.Sprintf("%s_%p", tb.Name(), tb)
+	tb.Cleanup(func() { Delete(name) })
+	Create(name, nil)
+
+	p := url.Values{"vfs": {"memdb"}}
+	for _, v := range params {
+		for k, v := range v {
+			for _, v := range v {
+				p.Add(k, v)
+			}
+		}
+	}
+
+	return (&url.URL{
+		Scheme:   "file",
+		OmitHost: true,
+		Path:     "/" + name,
+		RawQuery: p.Encode(),
+	}).String()
+}