Add unit test runner

dev.py

@@ -3,19 +3,33 @@ import os
 import subprocess
 import sys
 
-root_dir = sys.path[0]
+# The directory containing this script should be the root directory of the
+# locality repository.
+ROOT_DIR = sys.path[0]
 
 
 def devupdate(args):
     subprocess.run(
         [sys.executable, '-m', 'pip', 'install', '-r',
-         os.path.join(root_dir, 'dev-python-requirements.txt'), ])
+         os.path.join(ROOT_DIR, 'dev-python-requirements.txt'), ])
+
+
+def import_run():
+    """Import the scripts.run module and return it.
+
+    We do this in a function so that devupdate() can be run without everything
+    needed by this module being available."""
+    import scripts.run
+    scripts.run.ROOT_DIR = ROOT_DIR
+    return scripts.run
 
 
 def run(args):
-    import scripts.run
-    scripts.run.ROOT_DIR = root_dir  # TODO: FIXME
-    scripts.run.run(args)
+    import_run().run(args)
+
+
+def unit_tests(args):
+    import_run().unit_tests(args)
 
 
 parser = argparse.ArgumentParser()
@@ -24,6 +38,10 @@ run_parser = subparsers.add_parser(
     'run', help='Run a test instance of locality'
 )
 run_parser.set_defaults(func=run)
+run_parser = subparsers.add_parser(
+    'unit_test', help='Run unit tests'
+)
+run_parser.set_defaults(func=unit_tests)
 devupdate_parser = subparsers.add_parser(
     'devupdate', help='Install or update packages used by this script'
 )

scripts/run.py

@@ -8,20 +8,22 @@ from .postgres_container import PostgresContainer
 ROOT_DIR = None
 
 
-def run(args):
+def cargo(*args):
     global ROOT_DIR
     with PostgresContainer() as postgres:
         locality_env = {
             'LOCALITY_DATABASE_URL': postgres.get_url(),
+            'LOCALITY_TEST_DATABASE_URL': postgres.get_url(),
             'LOCALITY_STATIC_FILE_PATH': os.path.join(
                 ROOT_DIR,
                 'static'),
             'LOCALITY_HMAC_SECRET': 'iknf4390-8guvmr3'
         }
+        locality_env = os.environ.copy() | locality_env
 
         cargo_bin = shutil.which('cargo')
         locality_process = subprocess.Popen(
-            [cargo_bin, 'run'], env=locality_env, cwd=ROOT_DIR
+            [cargo_bin, *args], env=locality_env, cwd=ROOT_DIR
         )
 
         try:
@@ -32,3 +34,11 @@ def run(args):
         finally:
             if locality_process.poll() is None:
                 locality_process.terminate()
+
+
+def run(args):
+    cargo('run')
+
+
+def unit_tests(args):
+    cargo("test")