tests: drivers: can: api: Add negative test for can_add_rx_filter()

Check that error is reported when CAN filter is added without
callback function.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

tests/drivers/can/api/src/classic.c

@@ -615,6 +615,19 @@ ZTEST(can_classic, test_add_filter)
 	can_remove_rx_filter(can_dev, filter_id);
 }
 
+/**
+ * @brief Test adding filter without callback.
+ */
+ZTEST(can_classic, test_add_filter_without_callback)
+{
+	int err;
+
+	Z_TEST_SKIP_IFNDEF(CONFIG_RUNTIME_ERROR_CHECKS);
+
+	err = can_add_rx_filter(can_dev, NULL, NULL, &test_std_filter_1);
+	zassert_equal(err, -EINVAL, "added filter with NULL callback");
+}
+
 /**
  * @brief Test adding an invalid CAN RX filter.
  *