Add initial snapshot tests

doc/.gitignore

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+out.html
+
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doc/pyproject.toml

@@ -7,7 +7,7 @@ markers = [
     "file_contents: data for fixtures to write to files",
     "fixture_data: other misc data",
 ]
-pythonpath = ["src", "test"]
+pythonpath = ["."]
 
 [tool.coverage.report]
 include_namespace_packages = true

doc/test/test_snapshot.py

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+from pathlib import Path
+
+from collate_data import main
+from syrupy.assertion import SnapshotAssertion
+
+
+def test_full_html(snapshot: SnapshotAssertion, tmp_path: Path):
+    # generate output docs html file and assert it hasn't changed vs. the snapshot
+    # arrange
+    out_path = tmp_path / "out.html"
+    argv = [
+        "collate_data.py",
+        "../Common/src/main/resources",  # resources dir
+        "hexcasting",  # mod name
+        "thehexbook",  # book name
+        "template.html",  # template file
+        out_path.as_posix(),  # output file
+    ]
+
+    # act
+    main(argv)
+
+    # assert
+    actual = out_path.read_text()
+    assert actual == snapshot