verify conda activation (and thereby entrypoint)

in tests/conda/simple

use pytest for better error reporting

Author: minrk

tests/conda/simple/environment.yml

@@ -1,2 +1,3 @@
 dependencies:
   - numpy
+  - pytest

tests/conda/simple/verify

@@ -1,6 +1,2 @@
-#!/usr/bin/env python
-import sys
-
-assert sys.version_info[:2] == (3, 7), sys.version
-
-import numpy
+#!/bin/sh
+pytest -v ./verify.py

tests/conda/simple/verify.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import os
+import sys
+
+def test_sys_version():
+    assert sys.version_info[:2] == (3, 7)
+
+def test_numpy():
+    import numpy
+
+def test_conda_activated():
+    assert os.environ.get("CONDA_PREFIX") == os.environ["NB_PYTHON_PREFIX"], dict(os.environ)