Fixed database typo and removed unnecessary class identifier.

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

@@ -0,0 +1,18 @@
+import matplotlib.pyplot as plt
+from matplotlib.texmanager import TexManager
+
+
+def test_fontconfig_preamble():
+    """
+    Test that the preamble is included in _fontconfig
+    """
+    plt.rcParams['text.usetex'] = True
+
+    tm1 = TexManager()
+    font_config1 = tm1.get_font_config()
+
+    plt.rcParams['text.latex.preamble'] = '\\usepackage{txfonts}'
+    tm2 = TexManager()
+    font_config2 = tm2.get_font_config()
+
+    assert font_config1 != font_config2