support/testing: add new test for python-pymupdf

To give us a chance to catch runtime issues (such as missing
dependencies) more easily, add a test that writes a sample PDF file,
read it back and verify the text that was read.

Like similar packages that lead to a big
rootfs (e.g. python-botocore), this test requires a separate ext2
rootfs to avoid filling the default amount of RAM available
entirely (which would cause missing files from the root filesystem and
in turn, test failures).

Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_pymupdf.py

@@ -0,0 +1,17 @@
+import fitz
+
+# Write a test PDF file
+outfile = "python-pymupdf.pdf"
+sample_text = "This is a test page for python-pymupdf."
+doc = fitz.open()
+page = doc.new_page()
+p = fitz.Point(50, 72)
+page.insert_text(p, sample_text)
+doc.save(outfile)
+
+# Read back the file
+with fitz.open(outfile) as d:  # open document
+    read_text = chr(12).join([page.get_text() for page in d])
+
+print(read_text)
+assert(read_text == sample_text + "\n")