1 files changed, 41 insertions, 0 deletions
diff --git a/jstests/aggregation/sources/graphLookup/variables.js b/jstests/aggregation/sources/graphLookup/variables.js
new file mode 100644
index 00000000000..87e2c8b3975
--- /dev/null
+++ b/jstests/aggregation/sources/graphLookup/variables.js
@@ -0,0 +1,41 @@
+/**
+ * Tests to verify that $graphLookup can use the variables defined in an outer scope.
+ */
+(function() {
+    "use strict";
+
+    let local = db.graph_lookup_var_local;
+    let foreign = db.graph_lookup_var_foreign;
+    local.drop();
+    foreign.drop();
+
+    foreign.insert({from: "b", to: "a", _id: 0});
+    local.insert({});
+
+    const basicGraphLookup = {
+        $graphLookup: {
+            from: "graph_lookup_var_foreign",
+            startWith: "$$var1",
+            connectFromField: "from",
+            connectToField: "to",
+            as: "resultsFromGraphLookup"
+        }
+    };
+
+    const lookup = {
+        $lookup: {
+            from: "graph_lookup_var_local",
+            let : {var1: "a"},
+            pipeline: [basicGraphLookup],
+            as: "resultsFromLookup"
+        }
+    };
+
+    // Verify that $graphLookup can use the variable 'var1' which is defined in parent $lookup.
+    let res = local.aggregate([lookup]).toArray();
+    assert.eq(res.length, 1);
+    assert.eq(res[0].resultsFromLookup.length, 1);
+    assert.eq(res[0].resultsFromLookup[0].resultsFromGraphLookup.length, 1);
+    assert.eq(res[0].resultsFromLookup[0].resultsFromGraphLookup[0], {_id: 0, from: "b", to: "a"});
+
+})();