Tests: added auction underflow panic test

Cargo.toml

@@ -17,7 +17,7 @@ debug-assertions = true
 
 [profile.release]
 opt-level = "z"
-overflow-checks = true
+overflow-checks = true # DEV: Do not remove this check - doing so will create vulnerabilities
 debug = 0
 strip = "symbols"
 debug-assertions = false

test-suites/tests/test_liquidation.rs

@@ -1121,3 +1121,72 @@ fn test_user_restore_position_and_delete_liquidation() {
     );
     assert!(pool_fixture.pool.try_get_auction(&0, &samwise).is_err());
 }
+
+#[test]
+#[should_panic]
+fn test_auction_underflow_panics() {
+    let fixture = create_fixture_with_data(true);
+    let frodo = fixture.users.get(0).unwrap();
+    let pool_fixture = &fixture.pools[0];
+
+    // Create a user
+    let samwise = Address::generate(&fixture.env); //sam will be supplying XLM and borrowing STABLE
+
+    // Mint users tokens
+    fixture.tokens[TokenIndex::XLM].mint(&samwise, &(500_000 * SCALAR_7));
+
+    // Supply and borrow sam tokens
+    let sam_requests: Vec<Request> = vec![
+        &fixture.env,
+        Request {
+            request_type: 2,
+            address: fixture.tokens[TokenIndex::XLM].address.clone(),
+            amount: 6_000 * SCALAR_7,
+        },
+        Request {
+            request_type: 4,
+            address: fixture.tokens[TokenIndex::STABLE].address.clone(),
+            amount: 200 * 10i128.pow(6),
+        },
+    ];
+    pool_fixture
+        .pool
+        .submit(&samwise, &samwise, &samwise, &sam_requests);
+
+    //tank xlm price
+    fixture.oracle.set_price_stable(&vec![
+        &fixture.env,
+        1000_0000000, // eth
+        1_0000000,    // usdc
+        0_0000100,    // xlm
+        1_0000000,    // stable
+    ]);
+
+    //fully liquidate user
+    let liq_pct = 100;
+    let auction_data_2 = pool_fixture
+        .pool
+        .new_liquidation_auction(&samwise, &liq_pct);
+
+    let usdc_bid_amount = auction_data_2
+        .bid
+        .get_unchecked(fixture.tokens[TokenIndex::STABLE].address.clone());
+
+    //fill user liquidation
+    let fill_requests = vec![
+        &fixture.env,
+        Request {
+            request_type: 6,
+            address: samwise.clone(),
+            amount: 100,
+        },
+        Request {
+            request_type: 5,
+            address: fixture.tokens[TokenIndex::STABLE].address.clone(),
+            amount: usdc_bid_amount,
+        },
+    ];
+    pool_fixture
+        .pool
+        .submit(&frodo, &frodo, &frodo, &fill_requests);
+}