func downgradeDB(t *testing.T, vdb *database.VersionedDB) {
// downgrade to 0
err := vdb.Migrate(0)
assert.Nil(t, err)
dbVersion, err := vdb.DBVersion()
assert.Nil(t, err)
assert.Equal(t, 0, dbVersion)
}
// Test wether the migration steps execute correctly.
func testDBVersioning(t *testing.T, vdb *database.VersionedDB) {
// get the DB version
dbVersion, err := vdb.DBVersion()
assert.Nil(t, err)
maxVersion := vdb.MaxDBVersion()
downgradeDB(t, vdb)
// upgrade the the latest version
err = vdb.Migrate(maxVersion)
assert.Nil(t, err)
dbVersion, err = vdb.DBVersion()
assert.Nil(t, err)
assert.Equal(t, maxVersion, dbVersion)
}