title: Failed: argument is not a function. Are you looking for `mapTo()`? (Karma-jasmine issue with rxjs map - shorthand - get method)
body: <p>I am trying to use: <code>map(this.service.method)</code> <br>
  instead of: <code>map((data) =&gt; this.service.method(data))</code> </p>
  
  <p><br></p>
  
  <p>But Karma tells me that: <br>
  <code>Failed: argument is not a function. Are you looking for `mapTo()`?</code> <br>
  and <code>mapTo</code> is not what I want to use there.</p>
  
  <p>Service method which I am trying to use:</p>
  
  <pre><code>get method() {
    return (data) =&gt; { ... }
  }
  </code></pre>