Revisit coverage in some tests

testing/test_compat.py

@@ -18,10 +18,10 @@ from _pytest.outcomes import OutcomeException
 
 def test_is_generator():
     def zap():
-        yield
+        yield  # pragma: no cover
 
     def foo():
-        pass
+        pass  # pragma: no cover
 
     assert is_generator(zap)
     assert not is_generator(foo)
@@ -37,15 +37,20 @@ def test_real_func_loop_limit():
 
         def __getattr__(self, attr):
             if not self.left:
-                raise RuntimeError("its over")
+                raise RuntimeError("it's over")  # pragma: no cover
             self.left -= 1
             return self
 
     evil = Evil()
 
-    with pytest.raises(ValueError):
-        res = get_real_func(evil)
-        print(res)
+    with pytest.raises(
+        ValueError,
+        match=(
+            "could not find real function of <Evil left=800>\n"
+            "stopped at <Evil left=800>"
+        ),
+    ):
+        get_real_func(evil)
 
 
 def test_get_real_func():
@@ -54,14 +59,14 @@ def test_get_real_func():
     def decorator(f):
         @wraps(f)
         def inner():
-            pass
+            pass  # pragma: no cover
 
         if six.PY2:
             inner.__wrapped__ = f
         return inner
 
     def func():
-        pass
+        pass  # pragma: no cover
 
     wrapped_func = decorator(decorator(func))
     assert get_real_func(wrapped_func) is func

testing/test_modimport.py

@@ -30,8 +30,9 @@ def test_fileimport(modfile):
         stderr=subprocess.PIPE,
     )
     (out, err) = p.communicate()
-    if p.returncode != 0:
-        pytest.fail(
-            "importing %s failed (exitcode %d): out=%r, err=%r"
-            % (modfile, p.returncode, out, err)
+    assert p.returncode == 0, "importing %s failed (exitcode %d): out=%r, err=%r" % (
+        modfile,
+        p.returncode,
+        out,
+        err,
     )

testing/test_session.py

@@ -68,9 +68,7 @@ class SessionTests(object):
         passed, skipped, failed = reprec.listoutcomes()
         assert len(failed) == 1
         out = failed[0].longrepr.reprcrash.message
-        if not out.find("DID NOT RAISE") != -1:
-            print(out)
-            pytest.fail("incorrect raises() output")
+        assert "DID NOT RAISE" in out
 
     def test_syntax_error_module(self, testdir):
         reprec = testdir.inline_runsource("this is really not python")
@@ -148,7 +146,7 @@ class SessionTests(object):
         )
         try:
             reprec = testdir.inline_run(testdir.tmpdir)
-        except pytest.skip.Exception:
+        except pytest.skip.Exception:  # pragma: no covers
             pytest.fail("wrong skipped caught")
         reports = reprec.getreports("pytest_collectreport")
         assert len(reports) == 1