test(preset): fixes tests, doc and cli for presets

Author: huafu

docs/user/config/index.md

@@ -54,20 +54,18 @@ module.exports = {
 
 Any preset can also be used with other options.
 If you're already using another preset, you might want only some specific settings from the chosen `ts-jest` preset.
-In this case you'll need to use the JavaScript version of Jest config:
+In this case you'll need to use the JavaScript version of Jest config (comment/uncomment according to your use-case):
 
 ```js
 // jest.config.js
-const tsJestPresets = require('ts-jest/presets');
-
-const preset = tsJestPresets.defaults
-// const preset = tsJestPresets.jsWithTs
-// const preset = tsJestPresets.jsWithBabel
+const { defaults: tsjPreset } = require('ts-jest/presets');
+// const { jsWithTs: tsjPreset } = require('ts-jest/presets');
+// const { jsWithBabel: tsjPreset } = require('ts-jest/presets');
 
 module.exports = {
   // [...]
   transform: {
-    ...preset.transform,
+    ...tsjPreset.transform,
     // [...]
   }
 }

e2e/__tests__/__snapshots__/test-helpers.test.ts.snap

@@ -0,0 +1,63 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`test-helpers 1`] = `
+  × jest --no-cache
+  ↳ exit code: 1
+  ===[ STDOUT ]===================================================================
+  
+  ===[ STDERR ]===================================================================
+  PASS ./pass.spec.ts
+  FAIL ./fail.spec.ts
+    ● Test suite failed to run
+  
+      TypeScript diagnostics (customize using \`[jest-config].globals.ts-jest.diagnostics\` option):
+      fail.spec.ts:7:10 - error TS2554: Expected 0 arguments, but got 1.
+  
+      7   expect(mocked(foo)('hello')).toBeUndefined()
+                 ~~~~~~~~~~~~~~~~~~~~
+      fail.spec.ts:9:46 - error TS2345: Argument of type '42' is not assignable to parameter of type 'string'.
+  
+      9   expect(mocked(bar, true).dummy.deep.deeper(42)).toBeUndefined()
+                                                     ~~
+  
+  ts-jest[root] (WARN) The \`mocked\` helper has been moved to \`ts-jest/utils\`. Use \`import { mocked } from 'ts-jest/utils'\` instead.
+  PASS ./deprecated.spec.ts
+  
+  Test Suites: 1 failed, 2 passed, 3 total
+  Tests:       3 passed, 3 total
+  Snapshots:   0 total
+  Time:        XXs
+  Ran all test suites.
+  ================================================================================
+`;
+
+exports[`with esModuleInterop set to false 1`] = `
+  × jest --no-cache
+  ↳ exit code: 1
+  ===[ STDOUT ]===================================================================
+  
+  ===[ STDERR ]===================================================================
+  PASS ./pass.spec.ts
+  FAIL ./fail.spec.ts
+    ● Test suite failed to run
+  
+      TypeScript diagnostics (customize using \`[jest-config].globals.ts-jest.diagnostics\` option):
+      fail.spec.ts:7:10 - error TS2554: Expected 0 arguments, but got 1.
+  
+      7   expect(mocked(foo)('hello')).toBeUndefined()
+                 ~~~~~~~~~~~~~~~~~~~~
+      fail.spec.ts:9:46 - error TS2345: Argument of type '42' is not assignable to parameter of type 'string'.
+  
+      9   expect(mocked(bar, true).dummy.deep.deeper(42)).toBeUndefined()
+                                                     ~~
+  
+  ts-jest[root] (WARN) The \`mocked\` helper has been moved to \`ts-jest/utils\`. Use \`import { mocked } from 'ts-jest/utils'\` instead.
+  PASS ./deprecated.spec.ts
+  
+  Test Suites: 1 failed, 2 passed, 3 total
+  Tests:       3 passed, 3 total
+  Snapshots:   0 total
+  Time:        XXs
+  Ran all test suites.
+  ================================================================================
+`;

src/cli/cli.spec.ts

@@ -154,7 +154,7 @@ Jest configuration written to "${normalize('/foo/bar/jest.config.foo.js')}".
       expect(fs.writeFileSync.mock.calls).toEqual([
         [
           normalize('/foo/bar/jest.config.foo.js'),
-          `const tsjPreset = require('ts-jest/presets/js-with-ts');
+          `const { jsWithTs: tsjPreset } = require('ts-jest/presets');
 
 module.exports = {
   ...tsjPreset,

src/cli/helpers/presets.ts

@@ -38,7 +38,7 @@ const definePreset = (fullName: string): TsJestPresetDescriptor => ({
     return require(`../../../${fullName.replace(/^ts-jest\//, '')}/jest-preset`)
   },
   jsImport(varName = 'tsjPreset') {
-    return `const ${varName} = require('${this.fullName}')`
+    return `const { ${this.jsVarName}: ${varName} } = require('ts-jest/presets')`
   },
   get isDefault() {
     return fullName === JestPresetNames.default