pytest integration
inline-snapshot provides one pytest option with different flags (create, fix, trim, update, short-report, report, disable).
Snapshot comparisons return always True if you use one of the flags create, fix or review.
This is necessary because the whole test needs to be run to fix all snapshots like in this case:
from inline_snapshot import snapshot
def test_something():
assert 1 == snapshot(5)
assert 2 <= snapshot(5)
Note
Every flag with the exception of disable and short-report disables the pytest assert-rewriting.
--inline-snapshot=create,fix,trim,update¶
Approve the changes of the given category. These flags can be combined with report and review.
test_something.py
from inline_snapshot import snapshot
def test_something():
assert 1 == snapshot()
assert 2 <= snapshot(5)
> pytest test_something.py --inline-snapshot=create,report
============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.3.5, pluggy-1.5.0
rootdir: /tmp/tmp.GFRrEza03T
plugins: inline-snapshot-0.20.10
collected 1 item
test_something.py .E [100%]
═══════════════════════════════ inline-snapshot ════════════════════════════════
─────────────────────────────── Create snapshots ───────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -2,5 +2,5 @@ │
│ │
│ │
│ │
│ def test_something(): │
│ - assert 1 == snapshot() │
│ + assert 1 == snapshot(1) │
│ assert 2 <= snapshot(5) │
╰──────────────────────────────────────────────────────────────────────────────╯
These changes will be applied, because you used --inline-snapshot=create
──────────────────────────────── Trim snapshots ────────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -3,4 +3,4 @@ │
│ │
│ │
│ def test_something(): │
│ assert 1 == snapshot(1) │
│ - assert 2 <= snapshot(5) │
│ + assert 2 <= snapshot(2) │
╰──────────────────────────────────────────────────────────────────────────────╯
These changes are not applied.
Use --inline-snapshot=trim to apply them, or use the interactive mode with
--inline-snapshot=review
==================================== ERRORS ====================================
_____________________ ERROR at teardown of test_something ______________________
your snapshot is missing one value.
=========================== short test summary info ============================
ERROR test_something.py::test_something - Failed: your snapshot is missing one value.
========================== 1 passed, 1 error in 0.12s ==========================
--inline-snapshot=short-report¶
give a short report over which changes can be made to the snapshots
> pytest test_something.py --inline-snapshot=short-report
============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.3.5, pluggy-1.5.0
rootdir: /tmp/tmp.jjF44zhiWr
plugins: inline-snapshot-0.20.10
collected 1 item
test_something.py .E [100%]
═══════════════════════════════ inline-snapshot ════════════════════════════════
Info: one snapshot can be trimmed (--inline-snapshot=trim)
Error: one snapshot is missing a value (--inline-snapshot=create)
You can also use --inline-snapshot=review to approve the changes interactively
==================================== ERRORS ====================================
_____________________ ERROR at teardown of test_something ______________________
your snapshot is missing one value.
=========================== short test summary info ============================
ERROR test_something.py::test_something - Failed: your snapshot is missing one value.
========================== 1 passed, 1 error in 0.09s ==========================
Info
short-report exists mainly to show that snapshots have changed with enabled pytest assert-rewriting. This option will be replaced with report when this restriction is lifted.
--inline-snapshot=report¶
Shows a diff report over which changes can be made to the snapshots
> pytest test_something.py --inline-snapshot=report
============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.3.5, pluggy-1.5.0
rootdir: /tmp/tmp.qDEkVe6ffb
plugins: inline-snapshot-0.20.10
collected 1 item
test_something.py .E [100%]
═══════════════════════════════ inline-snapshot ════════════════════════════════
─────────────────────────────── Create snapshots ───────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -2,5 +2,5 @@ │
│ │
│ │
│ │
│ def test_something(): │
│ - assert 1 == snapshot() │
│ + assert 1 == snapshot(1) │
│ assert 2 <= snapshot(5) │
╰──────────────────────────────────────────────────────────────────────────────╯
These changes are not applied.
Use --inline-snapshot=create to apply them, or use the interactive mode with
--inline-snapshot=review
──────────────────────────────── Trim snapshots ────────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -3,4 +3,4 @@ │
│ │
│ │
│ def test_something(): │
│ assert 1 == snapshot() │
│ - assert 2 <= snapshot(5) │
│ + assert 2 <= snapshot(2) │
╰──────────────────────────────────────────────────────────────────────────────╯
These changes are not applied.
Use --inline-snapshot=trim to apply them, or use the interactive mode with
--inline-snapshot=review
==================================== ERRORS ====================================
_____________________ ERROR at teardown of test_something ______________________
your snapshot is missing one value.
=========================== short test summary info ============================
ERROR test_something.py::test_something - Failed: your snapshot is missing one value.
========================== 1 passed, 1 error in 0.10s ==========================
--inline-snapshot=review¶
Shows a diff report for each category and ask if you want to apply the changes
> pytest test_something.py --inline-snapshot=review
============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.3.5, pluggy-1.5.0
rootdir: /tmp/tmp.sxMPdKzSRu
plugins: inline-snapshot-0.20.10
collected 1 item
test_something.py .E [100%]
═══════════════════════════════ inline-snapshot ════════════════════════════════
─────────────────────────────── Create snapshots ───────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -2,5 +2,5 @@ │
│ │
│ │
│ │
│ def test_something(): │
│ - assert 1 == snapshot() │
│ + assert 1 == snapshot(1) │
│ assert 2 <= snapshot(5) │
╰──────────────────────────────────────────────────────────────────────────────╯
do you want to create these snapshots? [y/n] (n):
──────────────────────────────── Trim snapshots ────────────────────────────────
╭───────────────────────────── test_something.py ──────────────────────────────╮
│ @@ -3,4 +3,4 @@ │
│ │
│ │
│ def test_something(): │
│ assert 1 == snapshot(1) │
│ - assert 2 <= snapshot(5) │
│ + assert 2 <= snapshot(2) │
╰──────────────────────────────────────────────────────────────────────────────╯
do you want to trim these snapshots? [y/n] (n):
==================================== ERRORS ====================================
_____________________ ERROR at teardown of test_something ______________________
your snapshot is missing one value.
=========================== short test summary info ============================
ERROR test_something.py::test_something - Failed: your snapshot is missing one value.
========================== 1 passed, 1 error in 0.11s ==========================
--inline-snapshot=disable¶
Disables all the snapshot logic. snapshot(x) will just return x.
This can be used if you think exclude that snapshot logic causes a problem in your tests, or if you want to speedup your CI.
deprecation
This option was previously called --inline-snapshot-disable