t.info: test value-based assertions for format=json

- Assert metadata values: name, mapset, id, temporal_type, extent, number_of_maps
- Assert start_time/end_time in ISO format
- Replace key-only checks with value assertions; use deterministic r.mapcalc expression

Author: sakirr

temporal/t.info/testsuite/test_t_info_json.py

@@ -0,0 +1,90 @@
+"""Test t.info format=json output.
+
+(C) 2025 by the GRASS Development Team
+This program is free software under the GNU General Public
+License (>=v2). Read the file COPYING that comes with GRASS
+for details.
+
+Validates that t.info format=json returns valid JSON and that
+parsed output contains correct metadata values (not only keys).
+"""
+
+import json
+
+import grass.script as gs
+
+from grass.gunittest.case import TestCase
+from grass.gunittest.gmodules import SimpleModule
+
+
+class TestTinfoJson(TestCase):
+    """Value-based tests for t.info format=json."""
+
+    @classmethod
+    def setUpClass(cls):
+        """Set region and create a space time raster dataset with one map."""
+        cls.use_temp_region()
+        cls.runModule(
+            "g.region", s=0, n=80, w=0, e=120, b=0, t=50, res=10, res3=10, flags="p3"
+        )
+        cls.runModule(
+            "r.mapcalc", expression="prec_1 = 1", overwrite=True
+        )
+        cls.runModule(
+            "t.create",
+            type="strds",
+            temporaltype="absolute",
+            output="precip_abs1",
+            title="A test",
+            description="A test",
+            overwrite=True,
+        )
+        cls.runModule(
+            "t.register",
+            type="raster",
+            flags="i",
+            input="precip_abs1",
+            maps="prec_1",
+            start="2001-01-01",
+            increment="20 years",
+            overwrite=True,
+        )
+        cls.mapset = gs.gisenv()["MAPSET"]
+
+    @classmethod
+    def tearDownClass(cls):
+        """Remove dataset and temporary region."""
+        cls.runModule("t.remove", flags="df", type="strds", inputs="precip_abs1")
+        cls.del_temp_region()
+
+    def test_t_info_format_json_returns_valid_json(self):
+        """t.info format=json outputs valid JSON (parseable with json.loads)."""
+        info = SimpleModule("t.info", format="json", type="strds", input="precip_abs1")
+        self.assertModule(info)
+        out = info.outputs.stdout
+        self.assertIsNotNone(out)
+        parsed = json.loads(out)
+        self.assertIsInstance(parsed, dict)
+
+    def test_t_info_format_json_metadata_values(self):
+        """Parsed JSON from t.info format=json has correct metadata values."""
+        info = SimpleModule("t.info", format="json", type="strds", input="precip_abs1")
+        self.assertModule(info)
+        parsed = json.loads(info.outputs.stdout)
+
+        self.assertEqual(parsed["name"], "precip_abs1")
+        self.assertEqual(parsed["mapset"], self.mapset)
+        self.assertEqual(parsed["id"], f"precip_abs1@{self.mapset}")
+        self.assertEqual(parsed["temporal_type"], "absolute")
+
+        self.assertEqual(parsed["north"], 80)
+        self.assertEqual(parsed["south"], 0)
+        self.assertEqual(parsed["east"], 120)
+        self.assertEqual(parsed["west"], 0)
+
+        self.assertEqual(parsed["number_of_maps"], 1)
+        self.assertEqual(parsed["title"], "A test")
+        self.assertEqual(parsed["description"], "A test")
+
+        self.assertEqual(parsed["start_time"], "2001-01-01T00:00:00")
+        self.assertEqual(parsed["end_time"], "2021-01-01T00:00:00")