1 files changed, 38 insertions, 0 deletions
diff --git a/jstests/core/mod_with_where.js b/jstests/core/mod_with_where.js
new file mode 100644
index 00000000000..5f60ec8d0e7
--- /dev/null
+++ b/jstests/core/mod_with_where.js
@@ -0,0 +1,38 @@
+// Tests the behavior of $mod for match expressions.
+// @tags: [
+//   assumes_balancer_off,
+//   # Uses $where operator
+//   requires_scripting,
+// ]
+
+(function() {
+    "use strict";
+
+    const coll = db.mod_with_where;
+    coll.drop();
+
+    assert.writeOK(coll.insert([{a: 1}, {a: 2}, {a: 11}, {a: 20}, {a: "asd"}, {a: "adasdas"}]));
+
+    // Check basic mod usage.
+    assert.eq(2, coll.find("this.a % 10 == 1").itcount(), "A1");
+    assert.eq(2, coll.find({a: {$mod: [10, 1]}}).itcount(), "A2");
+    assert.eq(
+        0,
+        coll.find({a: {$mod: [10, 1]}}).explain("executionStats").executionStats.totalKeysExamined,
+        "A3");
+
+    assert.commandWorked(coll.createIndex({a: 1}));
+
+    // Check mod with an index.
+    assert.eq(2, coll.find("this.a % 10 == 1").itcount(), "B1");
+    assert.eq(2, coll.find({a: {$mod: [10, 1]}}).itcount(), "B2");
+    assert.eq(1, coll.find("this.a % 10 == 0").itcount(), "B3");
+    assert.eq(1, coll.find({a: {$mod: [10, 0]}}).itcount(), "B4");
+    assert.eq(
+        4,
+        coll.find({a: {$mod: [10, 1]}}).explain("executionStats").executionStats.totalKeysExamined,
+        "B5");
+    assert.eq(1, coll.find({a: {$gt: 5, $mod: [10, 1]}}).itcount());
+
+    assert(coll.drop());
+}());