Add a test for "empty" files that we don't actually write any blocks.

1 files changed, 78 insertions, 0 deletions

diff --git a/test/suite/test_empty.py b/test/suite/test_empty.py
new file mode 100644
index 00000000000..ecf97a4fcdb
--- /dev/null
+++ b/test/suite/test_empty.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+#
+# Copyright (c) 2008-2012 WiredTiger, Inc.
+#
+# This is free and unencumbered software released into the public domain.
+#
+# Anyone is free to copy, modify, publish, use, compile, sell, or
+# distribute this software, either in source code form or as a compiled
+# binary, for any purpose, commercial or non-commercial, and by any
+# means.
+#
+# In jurisdictions that recognize copyright laws, the author or authors
+# of this software dedicate any and all copyright interest in the
+# software to the public domain. We make this dedication for the benefit
+# of the public at large and to the detriment of our heirs and
+# successors. We intend this dedication to be an overt act of
+# relinquishment in perpetuity of all present and future rights to this
+# software under copyright law.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+import os
+import wiredtiger, wttest
+from helper import keyPopulate
+
+# test_empty.py
+#       Test that empty objects don't write anything other than a single sector.
+class test_empty(wttest.WiredTigerTestCase):
+    name = 'test_empty'
+
+    scenarios = [
+        ('file', dict(type='file:', fmt='r')),
+        ('file', dict(type='file:', fmt='S')),
+        ('table', dict(type='table:', fmt='r')),
+        ('table', dict(type='table:', fmt='S'))
+        ]
+
+    # Creating an object and then closing it shouldn't write any blocks.
+    def test_empty_create(self):
+        uri = self.type + self.name
+        self.session.create(uri, 'key_format=' + self.fmt)
+        self.session.close();
+        name = self.name
+        if self.type == "table:":
+            name = name + '.wt'
+        self.assertEquals(os.stat(name).st_size, 512)
+
+    # Creating an object, inserting a record and then removing it (that is,
+    # building an empty, dirty tree), shouldn't write any blocks.  This is
+    # not true for column-store objects, though, even deleting an object
+    # modifies the name space, which requires a write.
+    def test_empty(self):
+        if self.fmt == 'S':
+            uri = self.type + self.name
+            self.session.create(uri, 'key_format=' + self.fmt)
+
+            # Add a few records and remove them.
+            cursor = self.session.open_cursor(uri, None, None)
+            for i in range(1,5):
+                cursor.set_key(keyPopulate(self.fmt, i));
+                cursor.set_value("XXX");
+                cursor.insert();
+                cursor.remove();
+            self.session.close();
+
+            name = self.name
+            if self.type == "table:":
+                name = name + '.wt'
+            self.assertEquals(os.stat(name).st_size, 512)
+
+if __name__ == '__main__':
+    wttest.run()