Add a test for docstring coverage

.docstr.yaml

@@ -0,0 +1,15 @@
+paths: # list or string
+    - docstr_coverage
+badge: docs # Path
+exclude: .*/test # regex
+verbose: 3 # int (0-4)
+skip_magic: True # Boolean
+skip_file_doc: True # Boolean
+skip_init: True # Boolean
+skip_class_def: True # Boolean
+skip_private: True # Boolean
+follow_links: True # Boolean
+accept_empty: True # Boolean
+ignore_names_file: .*/test # regex
+fail_under: 90 # int
+percentage_only: True # Boolean

src/dysh/tests/test_docstr.py

@@ -0,0 +1,12 @@
+from docstr_coverage import analyze
+from glob import glob
+
+def test_docstring_coverage():
+    """
+    Checks that the percentage of Python functions with docstrings 
+    is >= 0%
+    """
+    pyfiles = glob('./**/*.py', recursive = True)
+    coverage_report = analyze(pyfiles)
+    coverage = coverage_report.count_aggregate().coverage()
+    assert coverage >= 0