<p></p>
<blockquote>
<p dir="auto">I still don't know what I need to change in the testing stub</p>
</blockquote>
<p dir="auto">I would guess:</p>
<div class="highlight highlight-source-ruby" dir="auto"><pre class="notranslate">  <span class="pl-k">def</span> <span class="pl-en">stub_straight_routing</span><span class="pl-kos">(</span><span class="pl-s1">start_instruction</span>: <span class="pl-s">"Start here"</span><span class="pl-kos">,</span> <span class="pl-s1">finish_instruction</span>: <span class="pl-s">"Finish there"</span><span class="pl-kos">)</span>
    <span class="pl-en">stub_routing</span> <span class="pl-s"><<~CALLBACK</span><span class="pl-s"></span>
<span class="pl-s">      const distance = points[0].distanceTo(points[1]);</span>
<span class="pl-s">      const time = distance * 30;</span>
<span class="pl-s">      return Promise.resolve({</span>
<span class="pl-s">        line: points,</span>
<span class="pl-s">        steps: [</span>
<span class="pl-s">          [points[0],  8, "<b>1.</b> <span class="pl-s1"><span class="pl-kos">#{</span><span class="pl-s1">start_instruction</span><span class="pl-kos">}</span></span>", distance, points],</span>
<span class="pl-s">          [points[1], 14, "<b>2.</b> <span class="pl-s1"><span class="pl-kos">#{</span><span class="pl-s1">finish_instruction</span><span class="pl-kos">}</span></span>", 0, [points[1]]]</span>
<span class="pl-s">        ],</span>
<span class="pl-s">        distance,</span>
<span class="pl-s">        time</span>
<span class="pl-s">      });</span>
<span class="pl-s">    CALLBACK</span>
  <span class="pl-k">end</span>

  <span class="pl-k">def</span> <span class="pl-en">stub_routing</span><span class="pl-kos">(</span><span class="pl-s1">callback_code</span><span class="pl-kos">)</span>
    <span class="pl-en">execute_script</span> <span class="pl-s"><<~SCRIPT</span><span class="pl-s"></span>
<span class="pl-s">      $(() => {</span>
<span class="pl-s">        for (const engine of OSM.Directions.engines) {</span>
<span class="pl-s">          engine.getRoute = (points, signal) => {</span>
<span class="pl-s">              <span class="pl-s1"><span class="pl-kos">#{</span><span class="pl-s1">callback_code</span><span class="pl-kos">}</span></span></span>
<span class="pl-s">          };</span>
<span class="pl-s">        }</span>
<span class="pl-s">      });</span>
<span class="pl-s">    SCRIPT</span>
  <span class="pl-k">end</span>
<span class="pl-en">end</span></pre></div>

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