Ignore _about.py in pytest coverage (unitaryfund#2379)

* ignore about.py

* correct typo in mitiq/pec/representations/optimal.py

* test about func

* remove -rP line from makefile

* use capsys

* add back removed blankline

.coveragerc

@@ -1,6 +1,8 @@
 [run]
 omit =
     */tests/*
+    mitiq/_about.py
+
 
 [report]
 # Regexes for lines to exclude from consideration

mitiq/_about.py

@@ -24,9 +24,9 @@ def about() -> None:
         pyquil_version = "Not installed"
 
     try:
-        from qiskit import __qiskit_version__  # pragma: no cover
+        from qiskit import __qiskit_version__
 
-        qiskit_version = __qiskit_version__["qiskit"]  # pragma: no cover
+        qiskit_version = __qiskit_version__["qiskit"]
     except ImportError:
         qiskit_version = "Not installed"
 

mitiq/pec/representations/optimal.py

@@ -146,7 +146,7 @@ def find_optimal_representation(
                 " which are initialized with a numerical superoperator matrix."
             )
         else:
-            raise err  # pragma no cover
+            raise err  # pragma: no cover
 
     # Run numerical optimization problem
     quasi_prob_dist = minimize_one_norm(

mitiq/tests/test_about.py

@@ -0,0 +1,16 @@
+# Copyright (C) Unitary Fund
+#
+# This source code is licensed under the GPL license (v3) found in the
+# LICENSE file in the root directory of this source tree.
+
+"""Tests for mitiq.about()."""
+
+import mitiq
+
+
+def test_result_and_stdout(capsys):
+    mitiq.about()
+    captured = capsys.readouterr()
+    assert captured.out.startswith(
+        "\nMitiq: A Python toolkit for implementing"
+    )