Fix isMainnet propType error (#12951)

A propType error was showing up during e2e tests with a `testDev`
build. It was caused by `process.env.IN_TEST` being treated as a
boolean, when in fact it is either the string `'true'` or a boolean.

`IN_TEST` has been updated to always be a boolean. `loose-envify` has
no trouble injecting boolean values, so there's no reason to treat this
as a string.

app/scripts/background.js

@@ -56,7 +56,7 @@ const openMetamaskTabsIDs = {};
 const requestAccountTabIds = {};
 
 // state persistence
-const inTest = process.env.IN_TEST === 'true';
+const inTest = process.env.IN_TEST;
 const localStore = inTest ? new ReadOnlyNetworkStore() : new LocalStore();
 let versionedData;
 

app/scripts/controllers/network/createJsonRpcClient.js

@@ -10,7 +10,7 @@ import {
 import { PollingBlockTracker } from 'eth-block-tracker';
 import { SECOND } from '../../../../shared/constants/time';
 
-const inTest = process.env.IN_TEST === 'true';
+const inTest = process.env.IN_TEST;
 const blockTrackerOpts = inTest ? { pollingInterval: SECOND } : {};
 const getTestMiddlewares = () => {
   return inTest ? [createEstimateGasDelayTestMiddleware()] : [];

app/scripts/controllers/network/network.js

@@ -33,7 +33,7 @@ const env = process.env.METAMASK_ENV;
 const fetchWithTimeout = getFetchWithTimeout(SECOND * 30);
 
 let defaultProviderConfigOpts;
-if (process.env.IN_TEST === 'true') {
+if (process.env.IN_TEST) {
   defaultProviderConfigOpts = {
     type: NETWORK_TYPE_RPC,
     rpcUrl: 'http://localhost:8545',

development/build/scripts.js

@@ -779,7 +779,7 @@ function getEnvironmentVariables({ buildType, devMode, testing }) {
     METAMASK_VERSION: version,
     METAMASK_BUILD_TYPE: buildType,
     NODE_ENV: devMode ? ENVIRONMENT.DEVELOPMENT : ENVIRONMENT.PRODUCTION,
-    IN_TEST: testing ? 'true' : false,
+    IN_TEST: testing,
     PUBNUB_SUB_KEY: process.env.PUBNUB_SUB_KEY || '',
     PUBNUB_PUB_KEY: process.env.PUBNUB_PUB_KEY || '',
     CONF: devMode ? metamaskrc : {},

ui/components/app/edit-gas-fee-popover/edit-gas-fee-popover.js

@@ -29,7 +29,7 @@ const EditGasFeePopover = () => {
       className="edit-gas-fee-popover"
     >
       <>
-        {process.env.IN_TEST === 'true' ? null : <LoadingHeartBeat />}
+        {process.env.IN_TEST ? null : <LoadingHeartBeat />}
         <div className="edit-gas-fee-popover__wrapper">
           <div className="edit-gas-fee-popover__content">
             {balanceError && (

ui/components/app/edit-gas-popover/edit-gas-popover.component.js

@@ -261,7 +261,7 @@ export default function EditGasPopover({
           <EditGasDisplayEducation />
         ) : (
           <>
-            {process.env.IN_TEST === 'true' ? null : <LoadingHeartBeat />}
+            {process.env.IN_TEST ? null : <LoadingHeartBeat />}
             <EditGasDisplay
               showEducationButton={showEducationButton}
               warning={warning}

ui/helpers/utils/i18n-helper.js

@@ -32,7 +32,7 @@ export const getMessage = (localeCode, localeMessages, key, substitutions) => {
         );
         Sentry.captureException(missingMessageErrors[key]);
         log.error(missingMessageErrors[key]);
-        if (process.env.IN_TEST === 'true') {
+        if (process.env.IN_TEST) {
           throw missingMessageErrors[key];
         }
       }

ui/pages/confirm-transaction-base/confirm-transaction-base.component.js

@@ -68,7 +68,7 @@ const EIP_1559_V2_ENABLED =
   process.env.EIP_1559_V2 === true || process.env.EIP_1559_V2 === 'true';
 
 const renderHeartBeatIfNotInTest = () =>
-  process.env.IN_TEST === 'true' ? null : <LoadingHeartBeat />;
+  process.env.IN_TEST ? null : <LoadingHeartBeat />;
 
 export default class ConfirmTransactionBase extends Component {
   static contextTypes = {

ui/pages/confirm-transaction-base/gas-details-item/gas-details-item.js

@@ -17,8 +17,7 @@ import TransactionDetailItem from '../../../components/app/transaction-detail-it
 import UserPreferencedCurrencyDisplay from '../../../components/app/user-preferenced-currency-display';
 import { useGasFeeContext } from '../../../contexts/gasFee';
 
-const HeartBeat = () =>
-  process.env.IN_TEST === 'true' ? null : <LoadingHeartBeat />;
+const HeartBeat = () => (process.env.IN_TEST ? null : <LoadingHeartBeat />);
 
 const GasDetailsItem = ({
   hexMaximumTransactionFee,

ui/pages/import-token/import-token.container.js

@@ -22,9 +22,7 @@ const mapStateToProps = (state) => {
   const showSearchTabCustomNetwork =
     useTokenDetection && Boolean(Object.keys(tokenList).length);
   const showSearchTab =
-    getIsMainnet(state) ||
-    showSearchTabCustomNetwork ||
-    process.env.IN_TEST === 'true';
+    getIsMainnet(state) || showSearchTabCustomNetwork || process.env.IN_TEST;
   return {
     identities,
     mostRecentOverviewPage: getMostRecentOverviewPage(state),