SERVER-20084 do not set slaveOk in runReadCommand if a read pref has not

been set

1 files changed, 28 insertions, 0 deletions

diff --git a/jstests/noPassthroughWithMongod/default_read_pref.js b/jstests/noPassthroughWithMongod/default_read_pref.js
new file mode 100644
index 00000000000..05be7915626
--- /dev/null
+++ b/jstests/noPassthroughWithMongod/default_read_pref.js
@@ -0,0 +1,28 @@
+// Tests that the default read preference is 'unset', and that the slaveOk bit is not set
+// on read commands run with an 'unset' read preference.
+(function() {
+
+    "use strict";
+
+    var mongo = db.getMongo();
+    try {
+        var commandsRan = [];
+        db._mongo = {
+            getSlaveOk: function() { return false; },
+            getReadPrefMode: function() { return mongo.getReadPrefMode(); },
+            getReadPref: function() { return mongo.getReadPref(); },
+            runCommand: function(db, cmd, opts) {
+                commandsRan.push({db: db, cmd: cmd, opts:opts});
+            }
+        };
+
+        db.runReadCommand({ping: 1});
+        assert.eq(commandsRan.length, 1);
+        assert.docEq(commandsRan[0].cmd, {ping: 1}, "The command should not have been wrapped.");
+        assert.eq(commandsRan[0].opts & DBQuery.Option.slaveOk, 0, "The slaveOk bit should not be set.");
+
+    } finally {
+        db._mongo = mongo;
+    }
+
+})();