[Python-checkins] bpo-33901: Fix test_dbm_gnu for gdbm 1.15 (GH-7798)

[Victor Stinner]

https://github.com/python/cpython/commit/13c79c677f9ec9437c82eda72fa1c2d288d8fceb
commit: 13c79c677f9ec9437c82eda72fa1c2d288d8fceb
branch: 3.7
author: Victor Stinner <vstinner at redhat.com>
committer: GitHub <noreply at github.com>
date: 2018-06-19T18:19:23+02:00
summary:

bpo-33901: Fix test_dbm_gnu for gdbm 1.15 (GH-7798)

Fix test_dbm_gnu.test_reorganize() on macOS with gdbm 1.15: add a
larger value to make sure that the file size changes.

files:
A Misc/NEWS.d/next/Tests/2018-06-19-14-04-21.bpo-33901.OFW1Sr.rst
M Lib/test/test_dbm_gnu.py

diff --git a/Lib/test/test_dbm_gnu.py b/Lib/test/test_dbm_gnu.py
index 463d34341155..379601ad86de 100644
--- a/Lib/test/test_dbm_gnu.py
+++ b/Lib/test/test_dbm_gnu.py
@@ -72,9 +72,13 @@ def test_reorganize(self):
         self.g = gdbm.open(filename, 'c')
         size0 = os.path.getsize(filename)
 
-        self.g['x'] = 'x' * 10000
+        # bpo-33901: on macOS with gdbm 1.15, an empty database uses 16 MiB
+        # and adding an entry of 10,000 B has no effect on the file size.
+        # Add size0 bytes to make sure that the file size changes.
+        value_size = max(size0, 10000)
+        self.g['x'] = 'x' * value_size
         size1 = os.path.getsize(filename)
-        self.assertTrue(size0 < size1)
+        self.assertGreater(size1, size0)
 
         del self.g['x']
         # 'size' is supposed to be the same even after deleting an entry.
@@ -82,7 +86,8 @@ def test_reorganize(self):
 
         self.g.reorganize()
         size2 = os.path.getsize(filename)
-        self.assertTrue(size1 > size2 >= size0)
+        self.assertLess(size2, size1)
+        self.assertGreaterEqual(size2, size0)
 
     def test_context_manager(self):
         with gdbm.open(filename, 'c') as db:
diff --git a/Misc/NEWS.d/next/Tests/2018-06-19-14-04-21.bpo-33901.OFW1Sr.rst b/Misc/NEWS.d/next/Tests/2018-06-19-14-04-21.bpo-33901.OFW1Sr.rst
new file mode 100644
index 000000000000..2a2dec3e9fa1
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2018-06-19-14-04-21.bpo-33901.OFW1Sr.rst
@@ -0,0 +1,2 @@
+Fix test_dbm_gnu on macOS with gdbm 1.15: add a larger value to make sure that
+the file size changes.