test: swap flow cypress tests (#6331)

* test: swap flow cypress tests

* fix: use default parameter

* fix: use shared token addresses

* fix: fix test

* fix: nits

cypress/e2e/swap.test.ts

+import { SupportedChainId, WETH9 } from '@uniswap/sdk-core'
+
+import { getTestSelector } from '../utils'
+
 describe('Swap', () => {
+  const verifyAmount = (field: 'input' | 'output', amountText: string | null) => {
+    if (amountText === null) {
+      cy.get(`#swap-currency-${field} .token-amount-input`).should('not.have.value')
+    } else {
+      cy.get(`#swap-currency-${field} .token-amount-input`).should('have.value', amountText)
+    }
+  }
+
+  const verifyToken = (field: 'input' | 'output', tokenSymbol: string | null) => {
+    if (tokenSymbol === null) {
+      cy.get(`#swap-currency-${field} .token-symbol-container`).should('contain.text', 'Select token')
+    } else {
+      cy.get(`#swap-currency-${field} .token-symbol-container`).should('contain.text', tokenSymbol)
+    }
+  }
+
+  const selectOutput = (tokenSymbol: string) => {
+    // open token selector...
+    cy.contains('Select token').click()
+    // select token...
+    cy.contains(tokenSymbol).click()
+
+    cy.get('body')
+      .then(($body) => {
+        if ($body.find(getTestSelector('TokenSafetyWrapper')).length) {
+          return 'I understand'
+        }
+
+        return 'no-op' // Don't click on anything, a no-op
+      })
+      .then((content) => {
+        if (content !== 'no-op') {
+          cy.contains(content).click()
+        }
+      })
+
+    // token selector should close...
+    cy.contains('Search name or paste address').should('not.exist')
+  }
+
   before(() => {
     cy.visit('/swap')
   })
 
   it('starts with ETH selected by default', () => {
-    cy.get('#swap-currency-input .token-amount-input').should('have.value', '')
-    cy.get('#swap-currency-input .token-symbol-container').should('contain.text', 'ETH')
-    cy.get('#swap-currency-output .token-amount-input').should('not.have.value')
-    cy.get('#swap-currency-output .token-symbol-container').should('contain.text', 'Select token')
+    verifyAmount('input', '')
+    verifyToken('input', 'ETH')
+    verifyAmount('output', null)
+    verifyToken('output', null)
   })
 
   it('can enter an amount into input', () => {
@@ -30,24 +74,64 @@ describe('Swap', () => {
     cy.get('#swap-currency-output .token-amount-input').clear().type('0.0').should('have.value', '0.0')
   })
 
-  it.skip('can swap ETH for DAI', () => {
-    cy.get('#swap-currency-output .open-currency-select-button').click()
-    cy.get('.token-item-0xc7AD46e0b8a400Bb3C915120d284AafbA8fc4735').click()
-    cy.get('#swap-currency-input .token-amount-input').clear().type('0.0000001')
-    cy.get('#swap-currency-output .token-amount-input').should('not.equal', '')
-    cy.get('#swap-button').click()
-    cy.get('#confirm-swap-or-send').should('contain', 'Confirm Swap')
-    cy.get('[data-cy="confirmation-close-icon"]').click()
+  it('should have the correct default input/output and token selection should work', () => {
+    cy.visit('/swap')
+    verifyToken('input', 'ETH')
+    verifyToken('output', null)
+
+    selectOutput('WETH')
+    cy.get(getTestSelector('swap-currency-button')).first().click()
+
+    verifyToken('input', 'WETH')
+    verifyToken('output', 'ETH')
+  })
+
+  it('should have the correct default input from URL params ', () => {
+    cy.visit(`/swap?inputCurrency=${WETH9[SupportedChainId.GOERLI].address}`)
+
+    verifyToken('input', 'WETH')
+    verifyToken('output', null)
+
+    selectOutput('Ether')
+    cy.get(getTestSelector('swap-currency-button')).first().click()
+
+    verifyToken('input', 'ETH')
+    verifyToken('output', 'WETH')
   })
 
-  it('add a recipient does not exist unless in expert mode', () => {
-    cy.get('#add-recipient-button').should('not.exist')
+  it('should have the correct default output from URL params ', () => {
+    cy.visit(`/swap?outputCurrency=${WETH9[SupportedChainId.GOERLI].address}`)
+
+    verifyToken('input', null)
+    verifyToken('output', 'WETH')
+
+    cy.get(getTestSelector('swap-currency-button')).first().click()
+    verifyToken('input', 'WETH')
+    verifyToken('output', null)
+
+    selectOutput('Ether')
+    cy.get(getTestSelector('swap-currency-button')).first().click()
+
+    verifyToken('input', 'ETH')
+    verifyToken('output', 'WETH')
   })
 
-  it.skip('ETH to wETH is same value (wrapped swaps have no price impact)', () => {
-    cy.get('#swap-currency-output .open-currency-select-button').click()
-    cy.get('.token-item-0xc778417E063141139Fce010982780140Aa0cD5Ab').click()
+  it('ETH to wETH is same value (wrapped swaps have no price impact)', () => {
+    cy.visit('/swap')
+    selectOutput('WETH')
     cy.get('#swap-currency-input .token-amount-input').clear().type('0.01')
     cy.get('#swap-currency-output .token-amount-input').should('have.value', '0.01')
   })
+
+  it('Opens and closes the settings menu', () => {
+    cy.visit('/swap')
+    cy.contains('Settings').should('not.exist')
+    cy.get(getTestSelector('swap-settings-button')).click()
+    cy.contains('Slippage tolerance').should('exist')
+    cy.contains('Transaction deadline').should('exist')
+    cy.contains('Auto Router API').should('exist')
+    cy.contains('Expert Mode').should('exist')
+    cy.get(getTestSelector('swap-settings-button')).click()
+    cy.contains('Settings').should('not.exist')
+  })
 })

cypress/e2e/token-details.test.ts

-import { getTestSelector } from '../utils'
+import { getClassContainsSelector, getTestSelector } from '../utils'
+
+const UNI_ADDRESS = '0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984'
 
 describe('Token details', () => {
   before(() => {
@@ -7,7 +9,7 @@ describe('Token details', () => {
 
   it('Uniswap token should have all information populated', () => {
     // Uniswap token
-    cy.visit('/tokens/ethereum/0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984')
+    cy.visit(`/tokens/ethereum/${UNI_ADDRESS}`)
 
     // Price chart should be filled in
     cy.get('[data-cy="chart-header"]').should('include.text', '$')
@@ -28,18 +30,16 @@ describe('Token details', () => {
 
     // Links section should link out to Etherscan, More analytics, Website, Twitter
     cy.get('[data-cy="resources-container"]').within(() => {
-      cy.contains('Etherscan')
-        .should('have.attr', 'href')
-        .and('include', 'etherscan.io/address/0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984')
+      cy.contains('Etherscan').should('have.attr', 'href').and('include', `etherscan.io/address/${UNI_ADDRESS}`)
       cy.contains('More analytics')
         .should('have.attr', 'href')
-        .and('include', 'info.uniswap.org/#/tokens/0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984')
+        .and('include', `info.uniswap.org/#/tokens/${UNI_ADDRESS}`)
       cy.contains('Website').should('have.attr', 'href').and('include', 'uniswap.org')
       cy.contains('Twitter').should('have.attr', 'href').and('include', 'twitter.com/Uniswap')
     })
 
     // Contract address should be displayed
-    cy.contains('0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984').should('exist')
+    cy.contains(UNI_ADDRESS).should('exist')
 
     // Swap widget should have this token pre-selected as the “destination” token
     cy.get(getTestSelector('token-select')).should('include.text', 'UNI')
@@ -89,4 +89,28 @@ describe('Token details', () => {
       .should('include.text', 'Warning')
       .and('include.text', "This token isn't traded on leading U.S. centralized exchanges")
   })
+
+  describe('Swap on Token Detail Page', () => {
+    const verifyOutputToken = (outputText: string) => {
+      cy.get(getClassContainsSelector('TokenButtonRow')).last().contains(outputText)
+    }
+
+    beforeEach(() => {
+      // On mobile widths, we just link back to /swap instead of rendering the swap component.
+      cy.viewport(1200, 800)
+      cy.visit(`/tokens/goerli/${UNI_ADDRESS}`).then(() => {
+        cy.wait('@eth_blockNumber')
+      })
+    })
+
+    it('should have the expected output for a tokens detail page', () => {
+      verifyOutputToken('UNI')
+    })
+
+    it('should not share swap state with the main swap page', () => {
+      verifyOutputToken('UNI')
+      cy.visit('/swap')
+      cy.contains('UNI').should('not.exist')
+    })
+  })
 })

src/components/Settings/index.tsx

@@ -186,7 +186,7 @@ export default function SettingsTab({ placeholderSlippage }: { placeholderSlippa
         id="open-settings-dialog-button"
         aria-label={t`Transaction Settings`}
       >
-        <StyledMenuIcon />
+        <StyledMenuIcon data-testid="swap-settings-button" />
         {expertMode ? (
           <EmojiWrapper>
             <span role="img" aria-label="wizard-icon">

src/pages/Swap/index.tsx

@@ -552,6 +552,7 @@ export default function Swap({ className }: { className?: string }) {
                     element={InterfaceElementName.SWAP_TOKENS_REVERSE_ARROW_BUTTON}
                   >
                     <ArrowContainer
+                      data-testid="swap-currency-button"
                       onClick={() => {
                         onSwitchTokens()
                       }}