Test database locking

tests/test_lock.py

@@ -0,0 +1,29 @@
+import pytest
+
+import subprocess
+from time import sleep
+
+from electrolytes import *
+
+
+def test_lock_api_cli() -> None:
+    name = "TES7342982891"
+    try:
+        del database[name]
+    except KeyError:
+        pass
+
+    assert name not in database
+
+    database.add(Constituent(name=name,
+                             u_neg=[2.73],
+                             pkas_neg=[3.14]))
+
+    with database:
+        proc = subprocess.Popen(["electrolytes", "rm", name])
+        sleep(0.1)
+        del database[name]
+    proc.wait()
+
+    assert proc.returncode != 0
+    assert name not in database