1 files changed, 55 insertions, 0 deletions
diff --git a/jstests/covered_index_simple_1.js b/jstests/covered_index_simple_1.js
new file mode 100644
index 00000000000..44e3c00a9f8
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+++ b/jstests/covered_index_simple_1.js
@@ -0,0 +1,55 @@
+// Simple covered index query test
+
+var coll = db.getCollection("covered_simple_1")
+coll.drop()
+for (i=0;i<10;i++) {
+    coll.insert({foo:i})
+}
+for (i=0;i<10;i++) {
+    coll.insert({foo:i})
+}
+for (i=0;i<5;i++) {
+    coll.insert({bar:i})
+}
+coll.insert({foo:"string"})
+coll.insert({foo:{bar:1}})
+coll.insert({foo:null})
+coll.ensureIndex({foo:1})
+
+// Test equality with int value
+var plan = coll.find({foo:1}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.1 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.1 - nscannedObjects should be 0 for covered query")
+
+// Test equality with string value
+var plan = coll.find({foo:"string"}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.2 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.2 - nscannedObjects should be 0 for covered query")
+
+// Test equality with doc value
+var plan = coll.find({foo:{bar:1}}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.3 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.3 - nscannedObjects should be 0 for covered query")
+
+// Test no query
+var plan = coll.find({}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.4 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.4 - nscannedObjects should be 0 for covered query")
+
+// Test range query
+var plan = coll.find({foo:{$gt:2,$lt:6}}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.5 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.5 - nscannedObjects should be 0 for covered query")
+
+// Test in query
+var plan = coll.find({foo:{$in:[5,8]}}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.6 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.6 - nscannedObjects should be 0 for covered query")
+
+// Test no return
+var plan = coll.find({foo:"2"}, {foo:1, _id:0}).hint({foo:1}).explain()
+assert.eq(true, plan.indexOnly, "simple.1.7 - indexOnly should be true on covered query")
+assert.eq(0, plan.nscannedObjects, "simple.1.7 - nscannedObjects should be 0 for covered query")
+
+print ('all tests pass')
+