fix(auth): garder l identite Discord du cote verifie

tests/test_schema_report.py

@@ -257,3 +257,36 @@ class TestSeedAccountCheck:
         output = capsys.readouterr().out
         assert 'password has been changed' in output
         assert 'PASSWORD IS STILL' not in output
+
+
+class TestDiscordIdentityCheck:
+    def test_it_finds_identity_collisions_before_the_unique_migration(self, live_db, app, capsys):
+        engine, _tamper = live_db
+        path = str(engine.url).replace('sqlite:///', '')
+        connection = sqlite3.connect(path)
+        for username in ('alice', 'bob'):
+            connection.execute(
+                'INSERT INTO users '
+                '(username, password_hash, role, full_name, email, '
+                'is_active_account, discord_user_id) '
+                "VALUES (?, 'hash', 'player', ?, ?, 1, '222222222222222222')",
+                (username, username.title(), f'{username}@example.test'),
+            )
+        connection.commit()
+        connection.close()
+
+        with app.app_context():
+            result = main(['--url', str(engine.url), '--check-discord-identities'])
+
+        output = capsys.readouterr().out
+        assert result == 1
+        assert '222222222222222222: 2 accounts (alice, bob)' in output
+
+    def test_a_clean_identity_set_does_not_change_the_exit_code(self, live_db, app, capsys):
+        engine, _tamper = live_db
+
+        with app.app_context():
+            result = main(['--url', str(engine.url), '--check-discord-identities'])
+
+        assert result == 0
+        assert 'No Discord identity is shared' in capsys.readouterr().out