tests/NullInt.Scan: remove support for int{,8,16,32}

Those types are not driver.Value, but int was necessary because sqlmock
was not properly using pure driver.Value before. Now that I fixed the
issue in previous commit, we can remove the old hack.

Author: dolmen

stubs_test.go

@@ -23,20 +23,6 @@ func (ni *NullInt) Scan(value interface{}) error {
 	switch v := value.(type) {
 	case nil:
 		ni.Integer, ni.Valid = 0, false
-
-	// FIXME int, int8, int16, int32 types are handled here but that should not
-	// be necessary: only int64 is a driver.Value
-	// Unfortunately, the sqlmock testsuite currently relies on that because
-	// sqlmock doesn't properly limits itself internally to pure driver.Value.
-	case int:
-		ni.Integer, ni.Valid = v, true
-	case int8:
-		ni.Integer, ni.Valid = int(v), true
-	case int16:
-		ni.Integer, ni.Valid = int(v), true
-	case int32:
-		ni.Integer, ni.Valid = int(v), true
-
 	case int64:
 		const maxUint = ^uint(0)
 		const minUint = 0