added devserver

tests/test_devserver.py

@@ -0,0 +1,30 @@
+import time
+
+import pytest
+
+from tempfile import TemporaryDirectory
+from blag import devserver
+
+
+@pytest.fixture
+def tempdir():
+    with TemporaryDirectory() as dir:
+        yield dir
+
+
+def test_get_last_modified(tempdir):
+    # take initial time
+    t1 = devserver.get_last_modified([tempdir])
+
+    # wait a bit, create a file and measure again
+    time.sleep(0.1)
+    with open(f'{tempdir}/test', 'w') as fh:
+        fh.write('boo')
+    t2 = devserver.get_last_modified([tempdir])
+
+    # wait a bit and take time again
+    time.sleep(0.1)
+    t3 = devserver.get_last_modified([tempdir])
+
+    assert t2 > t1
+    assert t2 == t3