add a basic test of prjxray.util.get_row().gen_sites()

Signed-off-by: Alon <alon@pobox.com>

tests/test_util.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+
+from os import environ, getcwd, chdir
+import json
+from tempfile import TemporaryDirectory
+from contextlib import contextmanager
+from unittest import TestCase, main
+
+# Setup location of database file to a relative term so it can be generated
+# in the current subdirectory, which will be a temporary one, to allow concurent
+# testing.
+environ['XRAY_DATABASE_ROOT'] = '.'
+
+from prjxray.util import get_roi
+
+
+@contextmanager
+def setup_database(contents):
+    with TemporaryDirectory() as d:
+        olddir = getcwd()
+        chdir(d)
+        e = None
+        with open('tilegrid.json', 'w') as fd:
+            json.dump(contents, fd)
+        try:
+            yield
+        except Exception as ereal:
+            e = ereal
+        chdir(olddir)
+        if e is not None:
+            raise e
+
+
+class TestUtil(TestCase):
+    def test_get_roi_gen_sites(self):
+        makedb = lambda sites: {
+                "ATILE": {
+                    "bits": {
+                        "CLB_IO_CLK": {
+                            "baseaddr": "0x00400F00",
+                            "frames": 28,
+                            "height": 2,
+                            "offset": 0,
+                            "words": 2
+                        }
+                    },
+                    "grid_x": 10,
+                    "grid_y": 10,
+                    "segment": "ASEGMENT",
+                    "segment_type": "bram0_l",
+                    "sites": sites,
+                    "type": "BRAM_INT_INTERFACE_L"
+                }
+            }
+        with setup_database(makedb({})):
+            self.assertEquals(list(get_roi().gen_sites()), [])
+        with setup_database(makedb({'FOO': 'BAR'})):
+            self.assertEquals(
+                list(get_roi().gen_sites()), [('ATILE', 'FOO', 'BAR')])
+
+
+if __name__ == '__main__':
+    main()