fix(compiler): check if test file exists before doing type check (#1827)

Close #1506

Author: ahnpnl

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ts-jest",
-  "version": "26.1.3",
+  "version": "26.1.4-alpha.0",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "bin": "cli.js",

src/__mocks__/thing.spec.ts

@@ -1,3 +1,3 @@
 import { Thing } from './thing'
 
-export const thing: Thing = { a: 1 }
+export const thing: Thing = { a: 1, b: 2 }

src/compiler/__snapshots__/language-service.spec.ts.snap

@@ -36,6 +36,21 @@ exports[`Language service allowJs option should compile js file for allowJs true
   ================================================================================
 `;
 
+exports[`Language service diagnostics should not report diagnostics for test file which doesn't exist when compiling import module file 1`] = `
+Array [
+  "[level:20] compileAndUpdateOutput(): get compile output
+",
+  "[level:20] compileFn(): compiling using language service
+",
+  "[level:20] updateMemoryCache(): update memory cache for language service
+",
+  "[level:20] visitSourceFileNode(): hoisting
+",
+  "[level:20] compileFn(): computing diagnostics using language service
+",
+]
+`;
+
 exports[`Language service diagnostics should only report diagnostics for imported modules but not test files without cache 1`] = `
 Array [
   "[level:20] compileAndUpdateOutput(): get compile output

src/compiler/language-service.spec.ts

@@ -1,5 +1,5 @@
 import { LogLevels } from 'bs-logger'
-import { readFileSync } from 'fs'
+import { readFileSync, renameSync } from 'fs'
 import { removeSync } from 'fs-extra'
 import { join } from 'path'
 
@@ -174,6 +174,54 @@ describe('Language service', () => {
       removeSync(cacheDir)
     })
 
+    it(`should not report diagnostics for test file which doesn't exist when compiling import module file`, async () => {
+      const testFileName = require.resolve('../__mocks__/thing.spec.ts')
+      const testFileContent = readFileSync(testFileName, 'utf-8')
+      const cacheDir = join(process.cwd(), 'tmp')
+      /**
+       * Run the 1st compilation with Promise resolve setTimeout to stimulate 2 different test runs to test cached
+       * resolved modules
+       */
+      async function firstCompile() {
+        return new Promise((resolve) => {
+          const compiler1 = makeCompiler({
+            jestConfig: {
+              cache: true,
+              cacheDirectory: cacheDir,
+            },
+            tsJestConfig: baseTsJestConfig,
+          })
+
+          logTarget.clear()
+          compiler1.compile(testFileContent, testFileName)
+
+          // probably 300ms is enough to stimulate 2 separated runs after each other
+          setTimeout(() => resolve(), 300)
+        })
+      }
+
+      await firstCompile()
+
+      const newTestFileName = testFileName.replace('thing', 'thing2')
+      renameSync(testFileName, newTestFileName)
+
+      const compiler2 = makeCompiler({
+        jestConfig: {
+          cache: true,
+          cacheDirectory: cacheDir,
+        },
+        tsJestConfig: baseTsJestConfig,
+      })
+      logTarget.clear()
+
+      compiler2.compile(importedFileContent, importedFileName)
+
+      expect(logTarget.filteredLines(LogLevels.debug, Infinity)).toMatchSnapshot()
+
+      renameSync(newTestFileName, testFileName)
+      removeSync(cacheDir)
+    })
+
     it(`should only report diagnostics for imported modules but not test files without cache`, () => {
       const testFileName = require.resolve('../__mocks__/thing1.spec.ts')
       const testFileContent = readFileSync(testFileName, 'utf-8')

src/compiler/language-service.ts

@@ -1,5 +1,5 @@
 import { LogContexts, Logger, LogLevels } from 'bs-logger'
-import { readFileSync, writeFile } from 'fs'
+import { existsSync, readFileSync, writeFile } from 'fs'
 import { basename, normalize, relative, join } from 'path'
 import memoize = require('lodash.memoize')
 import mkdirp = require('mkdirp')
@@ -221,8 +221,12 @@ export const initializeLanguageServiceInstance = (configs: ConfigSet, logger: Lo
       /* istanbul ignore next (already covered with unit tests) */
       if (!configs.isTestFile(fileName)) {
         for (const [testFileName, resolvedModules] of memoryCache.resolvedModules.entries()) {
-          // Only do type checking for test files which haven't been type checked before
-          if (resolvedModules.includes(fileName) && !diagnosedFiles.includes(testFileName)) {
+          // Only do type checking for test files which haven't been type checked before as well as the file must exist
+          if (
+            resolvedModules.includes(fileName) &&
+            !diagnosedFiles.includes(testFileName) &&
+            existsSync(testFileName)
+          ) {
             const testFileContent = memoryCache.files.get(testFileName)?.text
             if (!testFileContent) {
               // Must set memory cache before attempting to get diagnostics