fix: improve mrt init UX — fix db_url quoting bug, clearer prompts and next steps

[croc100]

Problems

Three UX issues with mrt init:

1. db_url quoting bug (silent broken conftest)

When a user typed a literal URL, it was written without quotes:

# BEFORE (broken Python)
db_url=sqlite:///test.db,

# AFTER (correct)
db_url="sqlite:///test.db",

2. Confusing default prompt

The old default value was the raw Python expression os.environ.get("TEST_DATABASE_URL", "sqlite:///test.db") — a first-time user has no idea whether to type a URL or a Python expression.

New default is simply sqlite:///test.db with a tip printed above explaining the env var pattern for CI.

3. Weak next steps

After init completed, users only saw one line. Now shows:

• Step 1: run dynamic tests with the exact command
• Step 2: run static analysis with the detected path
• Docs link for when things go wrong

Bonus: import os is no longer added to generated conftest when a literal URL is used.

Before / After

# BEFORE
Next steps:
  pytest ./test_migrations.py -s

# AFTER
Setup complete. Next steps:

  1. Run dynamic rollback tests (requires a test DB):
     pytest ./test_migrations.py -s

  2. Run static analysis (no DB needed):
     mrt check versions/

  If tests fail, run with -v for details or check docs:
  https://croc100.github.io/pytest-mrt

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.93939% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pytest_mrt/commands/init.py	93.93%	1 Missing and 1 partial ⚠️

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