Move contexts to their own module

1 files changed, 59 insertions, 0 deletions

diff --git a/setuptools/tests/contexts.py b/setuptools/tests/contexts.py
new file mode 100644
index 00000000..a9626ae6
--- /dev/null
+++ b/setuptools/tests/contexts.py
@@ -0,0 +1,59 @@
+import tempfile
+import os
+import shutil
+import sys
+import contextlib
+
+from ..compat import StringIO
+
+
+@contextlib.contextmanager
+def tempdir(cd=lambda dir:None):
+    temp_dir = tempfile.mkdtemp()
+    orig_dir = os.getcwd()
+    try:
+        cd(temp_dir)
+        yield temp_dir
+    finally:
+        cd(orig_dir)
+        shutil.rmtree(temp_dir)
+
+
+@contextlib.contextmanager
+def environment(**updates):
+    old_env = os.environ.copy()
+    os.environ.update(updates)
+    try:
+        yield
+    finally:
+        for key in updates:
+            del os.environ[key]
+        os.environ.update(old_env)
+
+
+@contextlib.contextmanager
+def argv(repl):
+    old_argv = sys.argv[:]
+    sys.argv[:] = repl
+    yield
+    sys.argv[:] = old_argv
+
+
+@contextlib.contextmanager
+def quiet():
+    """
+    Redirect stdout/stderr to StringIO objects to prevent console output from
+    distutils commands.
+    """
+
+    old_stdout = sys.stdout
+    old_stderr = sys.stderr
+    new_stdout = sys.stdout = StringIO()
+    new_stderr = sys.stderr = StringIO()
+    try:
+        yield new_stdout, new_stderr
+    finally:
+        new_stdout.seek(0)
+        new_stderr.seek(0)
+        sys.stdout = old_stdout
+        sys.stderr = old_stderr