Re-land: Added virtualenv for depot_tools

bootstrap/virtualenv/tests/test_virtualenv.py

Index: bootstrap/virtualenv/tests/test_virtualenv.py
diff --git a/bootstrap/virtualenv/tests/test_virtualenv.py b/bootstrap/virtualenv/tests/test_virtualenv.py
new file mode 100644
index 0000000000000000000000000000000000000000..10c1136b8c72f9ab77fce486c890470236670788
--- /dev/null
+++ b/bootstrap/virtualenv/tests/test_virtualenv.py
@@ -0,0 +1,139 @@
+import virtualenv
+import optparse
+import os
+import shutil
+import sys
+import tempfile
+from mock import patch, Mock
+
+
+def test_version():
+    """Should have a version string"""
+    assert virtualenv.virtualenv_version, "Should have version"
+
+
+@patch('os.path.exists')
+def test_resolve_interpreter_with_absolute_path(mock_exists):
+    """Should return absolute path if given and exists"""
+    mock_exists.return_value = True
+    virtualenv.is_executable = Mock(return_value=True)
+
+    exe = virtualenv.resolve_interpreter("/usr/bin/python42")
+
+    assert exe == "/usr/bin/python42", "Absolute path should return as is"
+    mock_exists.assert_called_with("/usr/bin/python42")
+    virtualenv.is_executable.assert_called_with("/usr/bin/python42")
+
+
+@patch('os.path.exists')
+def test_resolve_interpreter_with_nonexistent_interpreter(mock_exists):
+    """Should exit when with absolute path if not exists"""
+    mock_exists.return_value = False
+
+    try:
+        virtualenv.resolve_interpreter("/usr/bin/python42")
+        assert False, "Should raise exception"
+    except SystemExit:
+        pass
+
+    mock_exists.assert_called_with("/usr/bin/python42")
+
+
+@patch('os.path.exists')
+def test_resolve_interpreter_with_invalid_interpreter(mock_exists):
+    """Should exit when with absolute path if not exists"""
+    mock_exists.return_value = True
+    virtualenv.is_executable = Mock(return_value=False)
+
+    try:
+        virtualenv.resolve_interpreter("/usr/bin/python42")
+        assert False, "Should raise exception"
+    except SystemExit:
+        pass
+
+    mock_exists.assert_called_with("/usr/bin/python42")
+    virtualenv.is_executable.assert_called_with("/usr/bin/python42")
+
+
+def test_activate_after_future_statements():
+    """Should insert activation line after last future statement"""
+    script = [
+        '#!/usr/bin/env python',
+        'from __future__ import with_statement',
+        'from __future__ import print_function',
+        'print("Hello, world!")'
+    ]
+    assert virtualenv.relative_script(script) == [
+        '#!/usr/bin/env python',
+        'from __future__ import with_statement',
+        'from __future__ import print_function',
+        '',
+        "import os; activate_this=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'activate_this.py'); exec(compile(open(activate_this).read(), activate_this, 'exec'), dict(__file__=activate_this)); del os, activate_this",
+        '',
+        'print("Hello, world!")'
+    ]
+
+
+def test_cop_update_defaults_with_store_false():
+    """store_false options need reverted logic"""
+    class MyConfigOptionParser(virtualenv.ConfigOptionParser):
+        def __init__(self, *args, **kwargs):
+            self.config = virtualenv.ConfigParser.RawConfigParser()
+            self.files = []
+            optparse.OptionParser.__init__(self, *args, **kwargs)
+
+        def get_environ_vars(self, prefix='VIRTUALENV_'):
+            yield ("no_site_packages", "1")
+
+    cop = MyConfigOptionParser()
+    cop.add_option(
+        '--no-site-packages',
+        dest='system_site_packages',
+        action='store_false',
+        help="Don't give access to the global site-packages dir to the "
+             "virtual environment (default)")
+
+    defaults = {}
+    cop.update_defaults(defaults)
+    assert defaults == {'system_site_packages': 0}
+
+def test_install_python_bin():
+    """Should create the right python executables and links"""
+    tmp_virtualenv = tempfile.mkdtemp()
+    try:
+        home_dir, lib_dir, inc_dir, bin_dir = \
+                                virtualenv.path_locations(tmp_virtualenv)
+        virtualenv.install_python(home_dir, lib_dir, inc_dir, bin_dir, False,
+                                  False)
+
+        if virtualenv.is_win:
+            required_executables = [ 'python.exe', 'pythonw.exe']
+        else:
+            py_exe_no_version = 'python'
+            py_exe_version_major = 'python%s' % sys.version_info[0]
+            py_exe_version_major_minor = 'python%s.%s' % (
+                sys.version_info[0], sys.version_info[1])
+            required_executables = [ py_exe_no_version, py_exe_version_major,
+                                     py_exe_version_major_minor ]
+
+        for pth in required_executables:
+            assert os.path.exists(os.path.join(bin_dir, pth)), ("%s should "
+                            "exist in bin_dir" % pth)
+    finally:
+        shutil.rmtree(tmp_virtualenv)
+
+
+def test_always_copy_option():
+    """Should be no symlinks in directory tree"""
+    tmp_virtualenv = tempfile.mkdtemp()
+    ve_path = os.path.join(tmp_virtualenv, 'venv')
+    try:
+        virtualenv.create_environment(ve_path, symlink=False)
+
+        for root, dirs, files in os.walk(tmp_virtualenv):
+            for f in files + dirs:
+                full_name = os.path.join(root, f)
+                assert not os.path.islink(full_name), "%s should not be a" \
+                    " symlink (to %s)" % (full_name, os.readlink(full_name))
+    finally:
+        shutil.rmtree(tmp_virtualenv)