Shell tool to easily migrate test fixtures

migrate-fixture.sh

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+### Example usage
+# WARNING! Deletes your sqlite database
+#
+# `sh migrate-fixture.sh refactor/date-attribute stregsystem/fixtures/testdata.json`
+# This will load the specified fixture on current `next` branch,
+# then it switches to the specified branch, and migrates the database,
+# then it dumps the database to the same file.
+### 
+
+# Setup load current test data
+rm db.sqlite3.bak
+mv db.sqlite3 db.sqlite3.bak
+git switch next
+python manage.py migrate
+python manage.py loaddata $2
+
+# Migrate test data
+git switch $1
+python manage.py migrate
+python manage.py dumpdata | tail -n +2 | python -m json.tool > $2
+