#N/A Add docker-based functional tests

tests/functional/utils.py

@@ -0,0 +1,57 @@
+import sys
+import os
+import pytest
+from contextlib import contextmanager
+import pexpect
+import subprocess
+import shutil
+from tempfile import mkdtemp
+from pathlib import Path
+
+root = str(Path(__file__).parent.parent.parent.resolve())
+
+
+def build_container(tag, dockerfile):
+    tmpdir = mkdtemp()
+    with Path(tmpdir).joinpath('Dockerfile').open('w') as file:
+        file.write(dockerfile)
+    if subprocess.call(['docker', 'build', '--tag={}'.format(tag), tmpdir]) != 0:
+        raise Exception("Can't build container")
+    shutil.rmtree(tmpdir)
+
+
+def read_until(proc, string='\n$ '):
+    text = ''
+    while True:
+        text += proc.read(1)
+        sys.stdout.write(text[-1])
+        sys.stdout.flush()
+        if text.endswith(string):
+            return text
+
+
+def run(proc, cmd):
+    proc.sendline(cmd)
+    return read_until(proc)
+
+
+@contextmanager
+def spawn(tag, volume, prepare=None):
+    if prepare is None:
+        prepare = []
+
+    proc = pexpect.spawnu(
+        'docker run --volume {} --tty=true --interactive=true {}'.format(
+            volume, tag))
+
+    try:
+        for line in prepare:
+            run(proc, line)
+        yield proc
+    finally:
+        proc.terminate()
+
+
+functional = pytest.mark.skipif(
+    not os.environ.get('FUNCTIONAL'),
+    reason='Functional tests are disabled by default.')