1 files changed, 32 insertions, 0 deletions
diff --git a/jstests/aggregation/bugs/server62242.js b/jstests/aggregation/bugs/server62242.js
new file mode 100644
index 00000000000..273dddbf16d
--- /dev/null
+++ b/jstests/aggregation/bugs/server62242.js
@@ -0,0 +1,32 @@
+// SERVER-62242
+// $indexOfArray does not work with duplicate values in array
+(function() {
+"use strict";
+
+const c = db[jsTest.name()];
+c.drop();
+
+c.save({_id: 0, number: 222});
+
+// before SERVER-62242, this incorrectly returned {_id: 0, number: 222, idx: -1}
+assert.eq(
+    [{_id: 0, number: 222, idx: 2}],
+    c.aggregate([{$addFields: {idx: {$indexOfArray: [[111, 111, 222], "$number"]}}}]).toArray());
+
+// this query was OK
+assert.eq([{_id: 0, number: 222, idx: 2}],
+          c.aggregate([
+               {$addFields: {idx: {$indexOfArray: [[111, 111, 222, 333], "$number"]}}}
+           ]).toArray());
+
+// also test for cases where a range is specified
+assert.eq([{_id: 0, number: 222, idx: -1}],
+          c.aggregate([
+               {$addFields: {idx: {$indexOfArray: [[111, 111, 222, 333], "$number", 0, 1]}}}
+           ]).toArray());
+
+assert.eq([{_id: 0, number: 222, idx: 3}],
+          c.aggregate([
+               {$addFields: {idx: {$indexOfArray: [[111, 111, 222, 222, 333], "$number", 3, 5]}}}
+           ]).toArray());
+})();