diff --git a/driver/driver_test.go b/driver/driver_test.go
index 353783c..266e840 100644
--- a/driver/driver_test.go
+++ b/driver/driver_test.go
@@ -14,7 +14,6 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/internal/util"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs"
 )
 
diff --git a/driver/savepoint_test.go b/driver/savepoint_test.go
index 54219a4..a95cb35 100644
--- a/driver/savepoint_test.go
+++ b/driver/savepoint_test.go
@@ -6,7 +6,6 @@ import (
 
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
diff --git a/ext/array/array_test.go b/ext/array/array_test.go
index a8844c2..0467b03 100644
--- a/ext/array/array_test.go
+++ b/ext/array/array_test.go
@@ -11,7 +11,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/array"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Example_driver() {
diff --git a/ext/blobio/blob_test.go b/ext/blobio/blob_test.go
index b7157b8..b6f9899 100644
--- a/ext/blobio/blob_test.go
+++ b/ext/blobio/blob_test.go
@@ -12,7 +12,7 @@ import (
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/array"
 	"github.com/ncruces/go-sqlite3/ext/blobio"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
diff --git a/ext/csv/csv_test.go b/ext/csv/csv_test.go
index b423d92..5f64343 100644
--- a/ext/csv/csv_test.go
+++ b/ext/csv/csv_test.go
@@ -8,7 +8,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/csv"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Example() {
diff --git a/ext/fileio/fileio_test.go b/ext/fileio/fileio_test.go
index 6c240a5..d08a9a7 100644
--- a/ext/fileio/fileio_test.go
+++ b/ext/fileio/fileio_test.go
@@ -11,7 +11,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/fileio"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Test_lsmode(t *testing.T) {
diff --git a/ext/fileio/fsdir_test.go b/ext/fileio/fsdir_test.go
index 53df2b9..95595c4 100644
--- a/ext/fileio/fsdir_test.go
+++ b/ext/fileio/fsdir_test.go
@@ -12,7 +12,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/fileio"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Test_fsdir(t *testing.T) {
diff --git a/ext/fileio/write_test.go b/ext/fileio/write_test.go
index 847c7d0..fc211fb 100644
--- a/ext/fileio/write_test.go
+++ b/ext/fileio/write_test.go
@@ -10,7 +10,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Test_writefile(t *testing.T) {
diff --git a/ext/hash/hash_test.go b/ext/hash/hash_test.go
index f1adc00..9bf67be 100644
--- a/ext/hash/hash_test.go
+++ b/ext/hash/hash_test.go
@@ -10,7 +10,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	_ "golang.org/x/crypto/blake2b"
 	_ "golang.org/x/crypto/blake2s"
 	_ "golang.org/x/crypto/md4"
diff --git a/ext/lines/lines_test.go b/ext/lines/lines_test.go
index 7fe310a..580617a 100644
--- a/ext/lines/lines_test.go
+++ b/ext/lines/lines_test.go
@@ -14,7 +14,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/lines"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Example() {
diff --git a/ext/pivot/pivot_test.go b/ext/pivot/pivot_test.go
index 959722f..aa64001 100644
--- a/ext/pivot/pivot_test.go
+++ b/ext/pivot/pivot_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/pivot"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 // https://antonz.org/sqlite-pivot-table/
diff --git a/ext/statement/stmt_test.go b/ext/statement/stmt_test.go
index 548238d..42b571a 100644
--- a/ext/statement/stmt_test.go
+++ b/ext/statement/stmt_test.go
@@ -8,7 +8,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/statement"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Example() {
diff --git a/ext/stats/quantile_test.go b/ext/stats/quantile_test.go
index 8870b5f..f43e9c3 100644
--- a/ext/stats/quantile_test.go
+++ b/ext/stats/quantile_test.go
@@ -6,7 +6,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/stats"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestRegister_quantile(t *testing.T) {
diff --git a/ext/stats/stats_test.go b/ext/stats/stats_test.go
index 34e19c1..4a5343a 100644
--- a/ext/stats/stats_test.go
+++ b/ext/stats/stats_test.go
@@ -7,7 +7,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/stats"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestRegister_variance(t *testing.T) {
diff --git a/ext/unicode/unicode_test.go b/ext/unicode/unicode_test.go
index 5c4dcc4..172b02a 100644
--- a/ext/unicode/unicode_test.go
+++ b/ext/unicode/unicode_test.go
@@ -7,7 +7,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestRegister(t *testing.T) {
diff --git a/ext/zorder/zorder_test.go b/ext/zorder/zorder_test.go
index 8033e9f..c8fbbe3 100644
--- a/ext/zorder/zorder_test.go
+++ b/ext/zorder/zorder_test.go
@@ -7,7 +7,7 @@ import (
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/ext/zorder"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestRegister_zorder(t *testing.T) {
diff --git a/gormlite/sqlite_test.go b/gormlite/sqlite_test.go
index c09d611..db20292 100644
--- a/gormlite/sqlite_test.go
+++ b/gormlite/sqlite_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestDialector(t *testing.T) {
diff --git a/tests/testcfg/testcfg.go b/internal/testcfg/testcfg.go
similarity index 100%
rename from tests/testcfg/testcfg.go
rename to internal/testcfg/testcfg.go
diff --git a/tests/backup_test.go b/tests/backup_test.go
index 1cefe66..095afea 100644
--- a/tests/backup_test.go
+++ b/tests/backup_test.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs"
 )
 
diff --git a/tests/blob_test.go b/tests/blob_test.go
index 413ab05..485b2b6 100644
--- a/tests/blob_test.go
+++ b/tests/blob_test.go
@@ -11,7 +11,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestBlob(t *testing.T) {
diff --git a/tests/bradfitz/sql_test.go b/tests/bradfitz/sql_test.go
index 7e57a7d..c0fd48d 100644
--- a/tests/bradfitz/sql_test.go
+++ b/tests/bradfitz/sql_test.go
@@ -14,7 +14,7 @@ import (
 
 	_ "github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 type Tester interface {
diff --git a/tests/conn_test.go b/tests/conn_test.go
index b5840c1..2525bcc 100644
--- a/tests/conn_test.go
+++ b/tests/conn_test.go
@@ -11,7 +11,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
diff --git a/tests/db_test.go b/tests/db_test.go
index 0ac50f8..00fb3ad 100644
--- a/tests/db_test.go
+++ b/tests/db_test.go
@@ -9,7 +9,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "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"
diff --git a/tests/driver_test.go b/tests/driver_test.go
index 5dc0239..e176ea1 100644
--- a/tests/driver_test.go
+++ b/tests/driver_test.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestDriver(t *testing.T) {
diff --git a/tests/ext_test.go b/tests/ext_test.go
index d5bcd07..7b879ed 100644
--- a/tests/ext_test.go
+++ b/tests/ext_test.go
@@ -5,7 +5,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func Test_base64(t *testing.T) {
diff --git a/tests/func_test.go b/tests/func_test.go
index 16beb3b..136a87b 100644
--- a/tests/func_test.go
+++ b/tests/func_test.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestCreateFunction(t *testing.T) {
diff --git a/tests/json_test.go b/tests/json_test.go
index 3796cf3..9d442ad 100644
--- a/tests/json_test.go
+++ b/tests/json_test.go
@@ -10,7 +10,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/julianday"
 )
 
diff --git a/tests/parallel/parallel_test.go b/tests/parallel/parallel_test.go
index ce6115d..e6b4762 100644
--- a/tests/parallel/parallel_test.go
+++ b/tests/parallel/parallel_test.go
@@ -12,7 +12,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "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"
diff --git a/tests/stmt_test.go b/tests/stmt_test.go
index 215de74..3fcdcf1 100644
--- a/tests/stmt_test.go
+++ b/tests/stmt_test.go
@@ -8,7 +8,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestStmt(t *testing.T) {
diff --git a/tests/time_test.go b/tests/time_test.go
index 2dd1462..3c67bee 100644
--- a/tests/time_test.go
+++ b/tests/time_test.go
@@ -10,7 +10,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 func TestTimeFormat_Encode(t *testing.T) {
diff --git a/tests/txn_test.go b/tests/txn_test.go
index 602136d..fb75307 100644
--- a/tests/txn_test.go
+++ b/tests/txn_test.go
@@ -7,7 +7,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
diff --git a/tests/vfs_test.go b/tests/vfs_test.go
index 7a6f7ce..d2b48e7 100644
--- a/tests/vfs_test.go
+++ b/tests/vfs_test.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs/memdb"
 	"github.com/ncruces/go-sqlite3/vfs/readervfs"
 )
diff --git a/tests/wal_test.go b/tests/wal_test.go
index 15fd92d..8c3b63e 100644
--- a/tests/wal_test.go
+++ b/tests/wal_test.go
@@ -7,7 +7,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/vfs"
 )
 
diff --git a/vfs/adiantum/adiantum_test.go b/vfs/adiantum/adiantum_test.go
index 0361f18..0f1d289 100644
--- a/vfs/adiantum/adiantum_test.go
+++ b/vfs/adiantum/adiantum_test.go
@@ -9,7 +9,7 @@ import (
 	"github.com/ncruces/go-sqlite3"
 	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 	"github.com/ncruces/go-sqlite3/util/ioutil"
 	"github.com/ncruces/go-sqlite3/vfs"
 	"github.com/ncruces/go-sqlite3/vfs/adiantum"
diff --git a/vfs/memdb/memdb_test.go b/vfs/memdb/memdb_test.go
index 2d1ed30..35ec244 100644
--- a/vfs/memdb/memdb_test.go
+++ b/vfs/memdb/memdb_test.go
@@ -7,7 +7,7 @@ import (
 
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
-	_ "github.com/ncruces/go-sqlite3/tests/testcfg"
+	_ "github.com/ncruces/go-sqlite3/internal/testcfg"
 )
 
 //go:embed testdata/wal.db