feat: mining mode switch to disable auto-mine (#6450)

* feat: mining mode switch to update so we can make assertions about pending transaction state

* update test to use explicit mining

* Update hardhat.config.js
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>

---------
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>

cypress/e2e/swap.test.ts

@@ -96,16 +96,19 @@ describe('Swap', () => {
         cy.get('#swap-button').click()
         cy.get('#confirm-swap-or-send').click()
         cy.get(getTestSelector('dismiss-tx-confirmation')).click()
-        // ui check
-        cy.get('#swap-currency-output [data-testid="balance-text"]').should(
-          'have.text',
-          `Balance: ${initialBalance + BALANCE_INCREMENT}`
-        )
-
-        // chain state check
-        cy.then(() => hardhat.utils.getBalance(hardhat.wallet.address, USDC_MAINNET))
-          .then((balance) => Number(balance.toFixed(1)))
-          .should('eq', initialBalance + BALANCE_INCREMENT)
+
+        cy.then(() => hardhat.send('hardhat_mine', ['0x1', '0xc'])).then(() => {
+          // ui check
+          cy.get('#swap-currency-output [data-testid="balance-text"]').should(
+            'have.text',
+            `Balance: ${initialBalance + BALANCE_INCREMENT}`
+          )
+
+          // chain state check
+          cy.then(() => hardhat.utils.getBalance(hardhat.wallet.address, USDC_MAINNET))
+            .then((balance) => Number(balance.toFixed(1)))
+            .should('eq', initialBalance + BALANCE_INCREMENT)
+        })
       })
   })
 

hardhat.config.js

@@ -21,6 +21,11 @@ module.exports = {
       accounts: {
         count: 1,
       },
+      // Disable auto-mining so that e2e tests can explicitly test pending states.
+      mining: {
+        auto: false,
+        interval: 0,
+      },
     },
   },
 }