create test libs on the fly

apps/remix-ide/src/app/tabs/test-tab.js

@@ -13,7 +13,7 @@ var { UnitTestRunner, assertLibCode } = require('@remix-project/remix-tests')
 const profile = {
   name: 'solidityUnitTesting',
   displayName: 'Solidity unit testing',
-  methods: ['testFromPath', 'testFromSource', 'setTestFolderPath', 'getTestlibs'],
+  methods: ['testFromPath', 'testFromSource', 'setTestFolderPath', 'getTestlibs', 'createTestLibs'],
   events: [],
   icon: 'assets/img/unitTesting.webp',
   description: 'Fast tool to generate unit tests for your contracts',
@@ -63,8 +63,8 @@ module.exports = class TestTab extends ViewPlugin {
   async createTestLibs () {
     const provider = await this.fileManager.currentFileProvider()
     if (provider) {
-      provider.addExternal('.deps/remix-tests/remix_tests.sol', assertLibCode, 'remix_tests.sol')
-      provider.addExternal('.deps/remix-tests/remix_accounts.sol', this.testRunner.accountsLibCode, 'remix_accounts.sol')
+      await provider.addExternal('.deps/remix-tests/remix_tests.sol', assertLibCode, 'remix_tests.sol')
+      await provider.addExternal('.deps/remix-tests/remix_accounts.sol', this.testRunner.accountsLibCode, 'remix_accounts.sol')
     }
   }
 

libs/remix-core-plugin/src/lib/compiler-content-imports.ts

@@ -129,14 +129,17 @@ export class CompilerImports extends Plugin {
         if (provider.type === 'localhost' && !provider.isConnected()) {
           throw new Error(`file provider ${provider.type} not available while trying to resolve ${url}`)
         }
-        const exist = await provider.exists(url)
+        let exist = await provider.exists(url)
         /*
           if the path is absolute and the file does not exist, we can stop here
           Doesn't make sense to try to resolve "localhost/node_modules/localhost/node_modules/<path>" and we'll end in an infinite loop.
         */
+        if (!exist && (url === 'remix_tests.sol' || url === 'remix_accounts.sol')) {
+            await this.call('solidityUnitTesting', 'createTestLibs')
+            exist = await provider.exists(url)
+        }
         if (!exist && url.startsWith('browser/')) throw new Error(`not found ${url}`)
         if (!exist && url.startsWith('localhost/')) throw new Error(`not found ${url}`)
-
         if (exist) {
           const content = await (() => {
             return new Promise((resolve, reject) => {