tests for assets pallet (#8487)

* tests for assets

* Update frame/assets/src/tests.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update frame/assets/src/tests.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* add force asset status check

* remove TODO

* actually remove TODO

* add force asset status tests

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

frame/assets/src/tests.rs

@@ -492,9 +492,6 @@ fn set_metadata_should_work() {
 	});
 }
 
-// TODO: tests for force_set_metadata, force_clear_metadata, force_asset_status
-// https://github.com/paritytech/substrate/issues/8470
-
 #[test]
 fn freezer_should_work() {
 	new_test_ext().execute_with(|| {
@@ -556,3 +553,82 @@ fn imbalances_should_work() {
 		assert_eq!(Assets::total_supply(0), 30);
 	});
 }
+
+#[test]
+fn force_metadata_should_work() {
+	new_test_ext().execute_with(|| {
+		//force set metadata works
+		assert_ok!(Assets::force_create(Origin::root(), 0, 1, true, 1));
+		assert_ok!(Assets::force_set_metadata(Origin::root(), 0, vec![0u8; 10], vec![0u8; 10], 8, false));
+		assert!(Metadata::<Test>::contains_key(0));
+
+		//overwrites existing metadata
+		let asset_original_metadata = Metadata::<Test>::get(0);
+		assert_ok!(Assets::force_set_metadata(Origin::root(), 0, vec![1u8; 10], vec![1u8; 10], 8, false));
+		assert_ne!(Metadata::<Test>::get(0), asset_original_metadata);
+
+		//attempt to set metadata for non-existent asset class
+		assert_noop!(
+			Assets::force_set_metadata(Origin::root(), 1, vec![0u8; 10], vec![0u8; 10], 8, false),
+			Error::<Test>::Unknown
+		);
+
+		//string length limit check
+		let limit = StringLimit::get() as usize;
+		assert_noop!(
+			Assets::force_set_metadata(Origin::root(), 0, vec![0u8; limit + 1], vec![0u8; 10], 8, false),
+			Error::<Test>::BadMetadata
+		);
+		assert_noop!(
+			Assets::force_set_metadata(Origin::root(), 0, vec![0u8; 10], vec![0u8; limit + 1], 8, false),
+			Error::<Test>::BadMetadata
+		);
+
+		//force clear metadata works
+		assert!(Metadata::<Test>::contains_key(0));
+		assert_ok!(Assets::force_clear_metadata(Origin::root(), 0));
+		assert!(!Metadata::<Test>::contains_key(0));
+
+		//Error handles clearing non-existent asset class
+		assert_noop!(Assets::force_clear_metadata(Origin::root(), 1), Error::<Test>::Unknown);
+	});
+}
+
+#[test]
+fn force_asset_status_should_work(){
+	new_test_ext().execute_with(|| {
+		Balances::make_free_balance_be(&1, 10);
+		Balances::make_free_balance_be(&2, 10);
+		assert_ok!(Assets::create(Origin::signed(1), 0, 1, 30));
+		assert_ok!(Assets::mint(Origin::signed(1), 0, 1, 50));
+		assert_ok!(Assets::mint(Origin::signed(1), 0, 2, 150));
+
+		//force asset status to change min_balance > balance 
+		assert_ok!(Assets::force_asset_status(Origin::root(), 0, 1, 1, 1, 1, 100, true, false));
+		assert_eq!(Assets::balance(0, 1), 50);
+
+		//account can recieve assets for balance < min_balance
+		assert_ok!(Assets::transfer(Origin::signed(2), 0, 1, 1));
+		assert_eq!(Assets::balance(0, 1), 51);
+
+		//account on outbound transfer will cleanup for balance < min_balance
+		assert_ok!(Assets::transfer(Origin::signed(1), 0, 2, 1));
+		assert_eq!(Assets::balance(0,1), 0);
+
+		//won't create new account with balance below min_balance
+		assert_noop!(Assets::transfer(Origin::signed(2), 0, 3, 50), TokenError::BelowMinimum);
+
+		//force asset status will not execute for non-existent class
+		assert_noop!(
+			Assets::force_asset_status(Origin::root(), 1, 1, 1, 1, 1, 90, true, false),
+			Error::<Test>::Unknown
+		);
+
+		//account drains to completion when funds dip below min_balance
+		assert_ok!(Assets::force_asset_status(Origin::root(), 0, 1, 1, 1, 1, 110, true, false));
+		assert_ok!(Assets::transfer(Origin::signed(2), 0, 1, 110));
+		assert_eq!(Assets::balance(0, 1), 200);
+		assert_eq!(Assets::balance(0, 2), 0);
+		assert_eq!(Assets::total_supply(0), 200);
+	});
+}