Angular + Jasmine Testing (HttpParams)

<!DOCTYPE html>
<html>

<head>
  <base href="." />
  <script type="text/javascript" charset="utf-8">
    window.AngularVersionForThisPlunker = 'latest'
  </script>
  <title>angular playground</title>
  <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
  
  <link data-require="jasmine@*" data-semver="2.4.1" rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine.css" />
  <script data-require="jasmine@*" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine.js"></script>
  <script data-require="jasmine@*" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/jasmine-html.js"></script>
  <script data-require="jasmine@*" data-semver="2.4.1" src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.4.1/boot.js"></script>
  
  <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
  <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
  <script src="https://unpkg.com/zone.js/dist/proxy.js"></script>
  <script src="https://unpkg.com/zone.js/dist/sync-test.js"></script>
  <script src="https://unpkg.com/zone.js/dist/jasmine-patch.js"></script>
  <script src="https://unpkg.com/zone.js/dist/async-test.js"></script>
  <script src="https://unpkg.com/zone.js/dist/fake-async-test.js"></script>
  
  <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
  <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
  <script data-require="typescript@*" data-semver="2.2.2" src="https://cdnjs.cloudflare.com/ajax/libs/typescript/2.2.2/typescript.min.js"></script>
  <script src="config.js"></script>
  <script>
    System.config({
      transpiler: 'typescript',
      typescriptOptions: {
        emitDecoratorMetadata: true
      },
      packages: {
        'src': {
          defaultExtension: 'ts'
        }
      }
    });
    System.import('src/base.spec')
      .then(function() {
        System.import('src/httpparams.spec')
          .then(function() {
            window.onload();
          });
      });
  </script>
</head>

<body>
</body>

</html>

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    '@angular/core': 'npm:@angular/core'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

import { TestBed } from '@angular/core/testing';
import { BrowserDynamicTestingModule, platformBrowserDynamicTesting } from '@angular/platform-browser-dynamic/testing';

TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());

import {HttpParams} from '@angular/common/http'

describe('HttpParams',()=>{
  
  it('should not return string literal for _null_',()=>{
    let params = new HttpParams()
      .set('arg', null);
      
    expect(params.toString()).toBe('arg=');
  });
  
  it('should not return string literal for _undefined_',()=>{
    let a = {};
    let params = new HttpParams()
      .set('arg', a.any);
      
    expect(params.toString()).toBe('arg=');
  })
});