test: add proper test pipeline

.gitignore

@@ -13,3 +13,6 @@ __pycache__/
 
 ### Poetry ###
 dist/
+
+### Beet ###
+.out

examples/sanity_test/beet.yaml

@@ -0,0 +1,7 @@
+data_pack:
+  load: src
+  overlays:
+    - formats:
+        min_inclusive: 48
+        max_inclusive: 48
+      directory: overlay_48

examples/sanity_test/src/data/demo/function/demo.mcfunction

@@ -0,0 +1 @@
+say I'm here now

examples/sanity_test/src/overlay_48/data/demo/function/demo.mcfunction

@@ -0,0 +1 @@
+say I was here first

pyproject.toml

@@ -17,6 +17,8 @@ isort = "^5.10.1"
 python-semantic-release = "^9.14.0"
 pyright = "^1.1.389"
 twine = "^5.1.1"
+lectern = "^0.34.0"
+pytest-insta = "^0.3.0"
 
 [tool.semantic_release]
 branch = "main"

tests/snapshots/examples__build_sanity_test__0.pack.md

@@ -0,0 +1,47 @@
+# Lectern snapshot
+
+## Data pack
+
+`@data_pack pack.mcmeta`
+
+```json
+{
+  "pack": {
+    "pack_format": 48,
+    "description": ""
+  },
+  "overlays": {
+    "entries": [
+      {
+        "formats": {
+          "min_inclusive": 48,
+          "max_inclusive": 48
+        },
+        "directory": "overlay_48"
+      }
+    ]
+  }
+}
+```
+
+### demo
+
+`@function demo:demo`
+
+```mcfunction
+say I'm here now
+```
+
+## Overlay `overlay_48`
+
+`@overlay overlay_48`
+
+### demo
+
+`@function demo:demo`
+
+```mcfunction
+say I was here first
+```
+
+`@endoverlay`

tests/test_examples.py

@@ -0,0 +1,16 @@
+import os
+from pathlib import Path
+
+import pytest
+from beet import ProjectCache, run_beet
+from lectern import Document
+from pytest_insta import SnapshotFixture
+
+
+@pytest.mark.parametrize("directory", os.listdir("examples"))
+def test_build(snapshot: SnapshotFixture, directory: str, tmp_path: Path):
+    with run_beet(
+        directory=f"examples/{directory}",
+        cache=ProjectCache(tmp_path / ".beet_cache", tmp_path / "generated"),
+    ) as ctx:
+        assert snapshot("pack.md") == ctx.inject(Document)