r.in.ascii: migrate tests from gunittest to pytest

raster/r.in.ascii/tests/r_in_ascii_test.py

@@ -0,0 +1,83 @@
+import io
+import os
+
+import pytest
+
+import grass.script as gs
+from grass.tools import Tools
+
+INPUT_EXPLICIT_NULL = """north: 4299000.00
+south: 4247000.00
+east: 528000.00
+west: 500000.00
+rows: 10
+cols: 15
+null: -9999
+
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 -9999 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 -9999
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+1 2 3 4 5 6 7 8 9 10 11 12 13 14 15"""
+
+INPUT_DEFAULT_NULL = """north: 220542
+south: 220528
+east: 638492
+west: 638478
+rows: 7
+cols: 7
+3 2 5 3 5 3 4
+1 4 5 5 5 * 4
+2 1 * 3 5 5 2
+4 2 4 4 4 5 4
+4 4 2 * 5 2 4
+1 2 1 1 2 2 2
+5 4 1 2 3 4 2"""
+
+
+@pytest.fixture
+def session(tmp_path):
+    """An isolated GRASS session with no maps."""
+    project = tmp_path / "r_in_ascii_project"
+    gs.create_project(project)
+    with gs.setup.init(project, env=os.environ.copy()) as session:
+        yield session
+
+
+def test_explicit_null_value(session):
+    """Cells matching the null= header become NULL, not data."""
+    tools = Tools(session=session)
+    tools.g_region(
+        n=4299000.00, s=4247000.00, e=528000.00, w=500000.00, rows=10, cols=15
+    )
+
+    tools.r_in_ascii(
+        input=io.StringIO(INPUT_EXPLICIT_NULL), output="ascii", type="CELL"
+    )
+
+    info = tools.r_info(map="ascii", format="json").json
+    assert info["min"] == 1
+    assert info["max"] == 15
+
+    univar = tools.r_univar(map="ascii", format="json").json
+    assert univar["null_cells"] == 2
+
+
+def test_default_null_character(session):
+    """Without a null= header, a bare * marks a cell as NULL."""
+    tools = Tools(session=session)
+    tools.g_region(n=220542, s=220528, e=638492, w=638478, rows=7, cols=7)
+
+    tools.r_in_ascii(input=io.StringIO(INPUT_DEFAULT_NULL), output="ascii", type="CELL")
+
+    info = tools.r_info(map="ascii", format="json").json
+    assert info["min"] == 1
+    assert info["max"] == 5
+
+    univar = tools.r_univar(map="ascii", format="json").json
+    assert univar["null_cells"] == 3