Test: th2 round trip

tests/data/label-align.th2

@@ -0,0 +1,49 @@
+encoding  utf-8
+##XTHERION## xth_me_area_adjust 0 0 290.000000 260.000000
+##XTHERION## xth_me_area_zoom_to 100
+
+
+
+scrap scrap1 -projection plan -scale [0 0 96 0 0 0 200 0 inch]
+
+line u:unknown -clip off
+  228.018 201.9699
+  228.018 60.5
+endline
+
+line u:unknown -clip off
+  0.5 96.7525
+  273.0948 96.7525
+endline
+
+line u:unknown -clip off
+  0.5 151.6229
+  273.0948 151.6229
+endline
+
+line u:unknown -clip off
+  107.2873 201.9699
+  107.2873 60.5
+endline
+
+point 107.288 151.623 label -align bl -text bottom-left
+
+point 107.288 96.753 label -align l -text left
+
+point 107.288 96.753 label -align t -text top
+
+point 228.018 96.753 label -text center
+
+point 107.288 96.753 label -align b -text bottom
+
+point 107.288 96.753 label -align r -text right
+
+point 107.288 151.623 label -align br -text bottom-right
+
+point 107.288 151.623 label -align tr -text top-right
+
+point 107.288 151.623 label -align tl -text top-left
+
+endscrap
+
+

tests/test_th2.py

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+import sys
+import pytest
+import subprocess
+import importlib
+from pathlib import Path
+from typing import AnyStr
+
+TESTS_DATA = Path(__file__).resolve().parent / "data"
+
+
+def _find_script(name: str) -> str:
+    spec = importlib.util.find_spec(name)
+    assert spec is not None
+    assert spec.origin is not None
+    return spec.origin
+
+
+def _non_empty_lines(buf: AnyStr) -> list[AnyStr]:
+    return [line for line in buf.splitlines() if line]
+
+
+def _assert_non_empty_lines_equal(left: AnyStr, right: AnyStr):
+    assert _non_empty_lines(left) == _non_empty_lines(right)
+
+
+script_th2_input = _find_script("th2_input")
+script_th2_output = _find_script("th2_output")
+
+
+@pytest.mark.parametrize("stem", [
+    ("label-align"),
+])
+def test_th2_round_trip(stem):
+    path_input = TESTS_DATA / f"{stem}.th2"
+    svgcontent = subprocess.check_output([
+        sys.executable,
+        script_th2_input,
+        str(path_input),
+    ])
+    th2content, stderr = subprocess.Popen(
+        [sys.executable, script_th2_output],
+        stdin=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+    ).communicate(svgcontent)
+    _assert_non_empty_lines_equal(path_input.read_bytes(), th2content)