Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/tests/test_usetex.py

@@ -0,0 +1,86 @@
+import numpy as np
+import pytest
+
+import matplotlib as mpl
+from matplotlib.testing.decorators import check_figures_equal, image_comparison
+import matplotlib.pyplot as plt
+
+
+if not mpl.checkdep_usetex(True):
+    pytestmark = pytest.mark.skip('Missing TeX of Ghostscript or dvipng')
+
+
+@image_comparison(
+    baseline_images=['test_usetex'],
+    extensions=['pdf', 'png'],
+    style="mpl20")
+def test_usetex():
+    mpl.rcParams['text.usetex'] = True
+    fig = plt.figure()
+    ax = fig.add_subplot(111)
+    kwargs = {"verticalalignment": "baseline", "size": 24,
+              "bbox": dict(pad=0, edgecolor="k", facecolor="none")}
+    ax.text(0.2, 0.7,
+            # the \LaTeX macro exercises character sizing and placement,
+            # \left[ ... \right\} draw some variable-height characters,
+            # \sqrt and \frac draw horizontal rules, \mathrm changes the font
+            r'\LaTeX\ $\left[\int\limits_e^{2e}'
+            r'\sqrt\frac{\log^3 x}{x}\,\mathrm{d}x \right\}$',
+            **kwargs)
+    ax.text(0.2, 0.3, "lg", **kwargs)
+    ax.text(0.4, 0.3, r"$\frac{1}{2}\pi$", **kwargs)
+    ax.text(0.6, 0.3, "$p^{3^A}$", **kwargs)
+    ax.text(0.8, 0.3, "$p_{3_2}$", **kwargs)
+    for x in {t.get_position()[0] for t in ax.texts}:
+        ax.axvline(x)
+    for y in {t.get_position()[1] for t in ax.texts}:
+        ax.axhline(y)
+    ax.set_axis_off()
+
+
+@check_figures_equal()
+def test_empty(fig_test, fig_ref):
+    mpl.rcParams['text.usetex'] = True
+    fig_test.text(.5, .5, "% a comment")
+
+
+@check_figures_equal()
+def test_unicode_minus(fig_test, fig_ref):
+    mpl.rcParams['text.usetex'] = True
+    fig_test.text(.5, .5, "$-$")
+    fig_ref.text(.5, .5, "\N{MINUS SIGN}")
+
+
+def test_mathdefault():
+    plt.rcParams["axes.formatter.use_mathtext"] = True
+    fig = plt.figure()
+    fig.add_subplot().set_xlim(-1, 1)
+    # Check that \mathdefault commands generated by tickers don't cause
+    # problems when later switching usetex on.
+    mpl.rcParams['text.usetex'] = True
+    fig.canvas.draw()
+
+
+def test_minus_no_descent():
+    # Test special-casing of minus descent in DviFont._height_depth_of, by
+    # checking that overdrawing a 1 and a -1 results in an overall height
+    # equivalent to drawing either of them separately.
+    mpl.style.use("mpl20")
+    heights = {}
+    fig = plt.figure()
+    for vals in [(1,), (-1,), (-1, 1)]:
+        fig.clf()
+        for x in vals:
+            fig.text(.5, .5, f"${x}$", usetex=True)
+        fig.canvas.draw()
+        # The following counts the number of non-fully-blank pixel rows.
+        heights[vals] = ((np.array(fig.canvas.buffer_rgba())[..., 0] != 255)
+                         .any(axis=1).sum())
+    assert len({*heights.values()}) == 1
+
+
+def test_textcomp_full():
+    plt.rcParams["text.latex.preamble"] = r"\usepackage[full]{textcomp}"
+    fig = plt.figure()
+    fig.text(.5, .5, "hello, world", usetex=True)
+    fig.canvas.draw()