add cm-super

scipy-notebook/Dockerfile

@@ -7,9 +7,9 @@ LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
 
 USER root
 
-# ffmpeg for matplotlib anim & dvipng for latex labels
+# ffmpeg for matplotlib anim & dvipng+cm-super for latex labels
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends ffmpeg dvipng && \
+    apt-get install -y --no-install-recommends ffmpeg dvipng cm-super && \
     rm -rf /var/lib/apt/lists/*
 
 USER $NB_UID

scipy-notebook/test/data/matplotlib_fonts_1.py

@@ -0,0 +1,20 @@
+# Matplotlit: Test tex fonts
+import matplotlib
+import matplotlib.pyplot as plt
+import os
+
+matplotlib.rcParams['pgf.texsystem'] = 'pdflatex'
+matplotlib.rcParams.update({'font.family': 'serif', 'font.size': 18,
+                            'axes.labelsize': 20, 'axes.titlesize': 24,
+                            'figure.titlesize': 28})
+matplotlib.rcParams['text.usetex'] = True
+
+fig, ax = plt.subplots(1, 1)
+x = [1, 2]
+y = [1, 2]
+ax.plot(x, y, label='a label')
+ax.legend(fontsize=15)
+
+file_path = os.path.join("/tmp", "test_fonts.png")
+fig.savefig(file_path)
+print(f"File {file_path} saved")

scipy-notebook/test/test_matplotlib.py

@@ -33,3 +33,30 @@ def test_matplotlib(container):
     cmd = running_container.exec_run(command)
     assert cmd.exit_code == 0, f"Command {command} failed"
     LOGGER.debug(cmd.output.decode("utf-8"))
+
+
+def test_matplotlib_fonts(container):
+    """Test matplotlib latex fonts, which depend on the cm-super package"""
+    host_data_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                                 "data")
+    cont_data_dir = "/home/jovyan/data"
+    test_file = "matplotlib_fonts_1.py"
+    output_dir = "/tmp"
+    LOGGER.info(f"Test cm-super latex labels in matplotlib ...")
+    command = "sleep infinity"
+    running_container = container.run(
+        volumes={host_data_dir: {"bind": cont_data_dir, "mode": "ro"}},
+        tty=True,
+        command=["start.sh", "bash", "-c", command],
+    )
+    command = f"python {cont_data_dir}/{test_file}"
+    cmd = running_container.exec_run(command)
+    assert cmd.exit_code == 0, f"Command {command} failed"
+    LOGGER.debug(cmd.output.decode("utf-8"))
+    # Checking if the file is generated
+    # https://stackoverflow.com/a/15895594/4413446
+    expected_file = f"{output_dir}/test_fonts.png"
+    command = f"test -s {expected_file}"
+    cmd = running_container.exec_run(command)
+    assert cmd.exit_code == 0, f"Command {command} failed"
+    LOGGER.debug(cmd.output.decode("utf-8"))