Tests: add pytest-based test for rasterExists helper function

python/grass/CMakeLists.txt

@@ -18,6 +18,7 @@ set(PYDIRS
     pygrass/shell
     pygrass/tests
     pygrass/vector
+    pytest
     script
     semantic_label
     temporal

python/grass/pytest/assertions.py

@@ -0,0 +1,7 @@
+import grass.script as gs
+
+
+def rasterExists(map_name, env=None):
+    """Check if a raster map exists in the given mapset."""
+    result = gs.find_file(map_name, element="cell", env=env)
+    return bool(result["name"])

python/grass/pytest/conftest.py

@@ -0,0 +1,12 @@
+import os
+import pytest
+import grass.script as gs
+
+
+@pytest.fixture
+def session(tmp_path):
+    project = tmp_path / "test_proj"
+    gs.create_project(project)
+
+    with gs.setup.init(project, env=os.environ.copy()) as session:
+        yield session.env

python/grass/pytest/tests/test_assertions.py

@@ -0,0 +1,9 @@
+import grass.script as gs
+from grass.pytest.assertions import rasterExists
+
+
+def test_rasterExists(session):
+    gs.run_command("r.mapcalc", expression="test_map = 1", env=session)
+
+    assert rasterExists("test_map", env=session)
+    assert not rasterExists("missing_map", env=session)