Outcome assertion added

contract/src/error.rs

@@ -102,4 +102,6 @@ pub enum Error {
         idx: String,
         source: std::num::TryFromIntError,
     },
+    #[error("Supported only 2 outcomes, received {total_outcomes}")]
+    UnsupportedOutcomes { total_outcomes: usize },
 }

contract/src/execute.rs

@@ -104,6 +104,11 @@ fn add_market(
         });
     }
 
+    let total_outcomes = outcomes.len();
+    if !total_outcomes == 2 {
+        return Err(Error::UnsupportedOutcomes { total_outcomes });
+    }
+
     let funds = funds.require_funds(&denom)?;
     let id = LAST_MARKET_ID
         .may_load(deps.storage)?

contract/src/tests.rs

@@ -533,6 +533,40 @@ fn house_always_wins() {
     assert!(house_balance > Uint128::zero());
 }
 
+#[test]
+fn market_with_only_one_outcome() {
+    let app = Predict::new();
+    let params = AddMarketParams {
+        title: "Test market".to_owned(),
+        description: "Test description".to_owned(),
+        arbitrator: app.arbitrator.clone().to_string(),
+        outcomes: vec![OutcomeDef {
+            label: "Yes".to_owned(),
+            initial_amount: Collateral(100u16.into()),
+        }],
+        denom: DENOM.to_owned(),
+        deposit_fee: "0.01".parse().unwrap(),
+        withdrawal_fee: "0.01".parse().unwrap(),
+        withdrawal_stop_date: app.app.borrow().block_info().time.plus_days(1),
+        deposit_stop_date: app.app.borrow().block_info().time.plus_days(2),
+        house: app.house.clone().into_string(),
+    };
+    app.app
+        .borrow_mut()
+        .execute_contract(
+            app.admin.clone(),
+            app.contract.clone(),
+            &ExecuteMsg::AddMarket {
+                params: params.into(),
+            },
+            &[Coin {
+                denom: DENOM.to_owned(),
+                amount: 100u16.into(),
+            }],
+        )
+        .unwrap();
+}
+
 proptest! {
 #[test]
 fn test_cpmm_buy_sell(pool_one in 1..1000u32, pool_two in 1..1000u32, buy in 2..50u32) {