test for correct prompt in batch (only, for now)

tests/unit/activation/test_batch.py

@@ -1,6 +1,8 @@
 from __future__ import absolute_import, unicode_literals
 
+import os
 import pipes
+import sys
 
 from virtualenv.activation import BatchActivator
 
@@ -20,7 +22,42 @@ def __init__(self, session):
 
         def _get_test_lines(self, activate_script):
             # for BATCH utf-8 support need change the character code page to 650001
-            return ["@echo off", "", "chcp 65001 1>NUL"] + super(Batch, self)._get_test_lines(activate_script)
+            return [
+                "@echo off",
+                "",
+                "chcp 65001 1>NUL",
+                self.print_python_exe(),
+                self.print_os_env_var("PROMPT"),
+                self.print_os_env_var("VIRTUAL_ENV"),
+                self.activate_call(activate_script),
+                self.print_python_exe(),
+                self.print_os_env_var("VIRTUAL_ENV"),
+                # \\ loads documentation from the virtualenv site packages
+                self.pydoc_call,
+                self.print_os_env_var("PROMPT"),
+                self.deactivate,
+                self.print_python_exe(),
+                self.print_os_env_var("VIRTUAL_ENV"),
+                self.print_os_env_var("PROMPT"),
+                "",  # just finish with an empty new line
+            ]
+
+        def assert_output(self, out, raw, tmp_path):
+            # pre-activation
+            assert out[0], raw
+            assert out[2] == "None", raw
+            # post-activation
+            expected = self._creator.exe.parent / os.path.basename(sys.executable)
+            assert self.norm_path(out[3]) == self.norm_path(expected), raw
+            assert self.norm_path(out[4]) == self.norm_path(self._creator.dest).replace("\\\\", "\\"), raw
+            assert out[5] == "wrote pydoc_test.html", raw
+            content = tmp_path / "pydoc_test.html"
+            assert os.path.basename(self._creator.dest) in out[6]
+            assert content.exists(), raw
+            # post deactivation, same as before
+            assert out[-3] == out[0], raw
+            assert out[-2] == "None", raw
+            assert out[1] == out[-1], raw
 
         def quote(self, s):
             """double quotes needs to be single, and single need to be double"""