<jupyter_start><jupyter_text>Test Mars Lab After building `mars_lab` according to the instructions in `README.md`, and installing the `mars_lab` conda package in a fresh environment, the following extensions should be installed and enabled:* `ipywidgets`* `plotly`* `sidecar`This notebook will exercise basic functionality of all three extensions to ensure they are working properly. Test import statements<jupyter_code>from ipywidgets import IntSlider
from sidecar import Sidecar
import plotly.graph_objs as go<jupyter_output><empty_output><jupyter_text>Test ipywidgets<jupyter_code>sl = IntSlider(description='Test slider')
sl<jupyter_output><empty_output><jupyter_text>Test sidecar with widget<jupyter_code>sc = Sidecar(title='Sidecar Widget')
with sc:
    display(sl)<jupyter_output><empty_output><jupyter_text>Test plotly FigureWidget<jupyter_code>fig = go.FigureWidget()
fig<jupyter_output><empty_output><jupyter_text>Test adding a trace to figure<jupyter_code>fig.add_scattergl(x=[0,1,2,3,4], y=[7,3,7,2,7])<jupyter_output><empty_output><jupyter_text>Test sidecar with figure<jupyter_code>sc2 = Sidecar(title='Sidecar Figure')
with sc2:
    display(fig)<jupyter_output><empty_output>
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