SERVER-9824 Add jstest

1 files changed, 45 insertions, 0 deletions

diff --git a/jstests/grow_hash_table.js b/jstests/grow_hash_table.js
new file mode 100644
index 00000000000..3e148b7240f
--- /dev/null
+++ b/jstests/grow_hash_table.js
@@ -0,0 +1,45 @@
+// This test creates a large projection, which causes a set of field names to
+// be stored in a StringMap (based on UnorderedFastKeyTable).  The hash table
+// starts with 20 slots, but must be grown repeatedly to hold the complete set
+// of fields.  This test verifies that we can grow the hash table repeatedly
+// with no failures.
+//
+// Related to SERVER-9824.
+
+var testDB = db.getSiblingDB('grow_hash_table');
+
+var doTest = function(count) {
+    print('Testing with count of ' + count);
+    testDB.dropDatabase();
+    var id = { data: 1 };
+    var doc = { _id: id };
+    var projection = { };
+
+    // Create a document and a projection with fields r1, r2, r3 ...
+    for (var i = 1; i <= count; ++i) {
+        var r = 'r' + i;
+        doc[r] = i;
+        projection[r] = 1;
+    }
+
+    // Store the document
+    testDB.collection.insert(doc);
+    var errorObj = testDB.getLastErrorObj();
+    assert(errorObj.err == null,
+           'Failed to insert document, getLastErrorObj = ' + tojsononeline(errorObj));
+
+    // Try to read the document using a large projection
+    try {
+        var findCount = testDB.collection.find({ _id: id }, projection).itcount();
+        assert(findCount == 1,
+               'Failed to find single stored document, find().itcount() == ' + findCount);
+    }
+    catch (e) {
+        testDB.dropDatabase();
+        doassert('Test FAILED!  Caught exception ' + tojsononeline(e));
+    }
+    testDB.dropDatabase();
+    jsTest.log('Test PASSED');
+}
+
+doTest(10000);