1 files changed, 36 insertions, 0 deletions
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index a6796d5..d225173 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -311,7 +311,43 @@ def test_both():
     finally:
         os.unlink(TESTFN)
 
+    # test mapping of entire file by passing 0 for map length
+    if hasattr(os, "stat"):
+        print "  Ensuring that passing 0 as map length sets map size to current file size."
+        f = open(TESTFN, "w+")
 
+        try:
+            f.write(2**16 * 'm') # Arbitrary character
+            f.close()
+
+            f = open(TESTFN, "rb+")
+            mf = mmap.mmap(f.fileno(), 0) 
+            verify(len(mf) == 2**16, "Map size should equal file size.")
+            vereq(mf.read(2**16), 2**16 * "m")
+            mf.close()
+            f.close()
+
+        finally:
+            os.unlink(TESTFN)
+    
+    # test mapping of entire file by passing 0 for map length
+    if hasattr(os, "stat"):
+        print "  Ensuring that passing 0 as map length sets map size to current file size."
+        f = open(TESTFN, "w+")
+        try:
+            f.write(2**16 * 'm') # Arbitrary character
+            f.close()
+    
+            f = open(TESTFN, "rb+")
+            mf = mmap.mmap(f.fileno(), 0) 
+            verify(len(mf) == 2**16, "Map size should equal file size.")
+            vereq(mf.read(2**16), 2**16 * "m")
+            mf.close()
+            f.close()
+    
+        finally:
+            os.unlink(TESTFN)
+    
     print ' Test passed'
 
 test_both()