Optimize tests: test_jsmath

tests/roots/test-ext-math/math.rst

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+Test math extensions :math:`E = m c^2`
+======================================
+
+This is inline math: :math:`a^2 + b^2 = c^2`.
+
+.. math:: a^2 + b^2 = c^2
+
+.. math::
+
+   a + 1 < b
+
+.. math::
+   :label: foo
+
+   e^{i\pi} = 1
+
+.. math::
+   :label:
+
+   e^{ix} = \cos x + i\sin x
+
+.. math::
+
+   n \in \mathbb N
+
+.. math::
+   :nowrap:
+
+   a + 1 < b
+
+Referencing equation :eq:`foo`.