Add memory integration tests

Will use them to confirm allocation override changes redis memory report
(#2)

tests/integration.sh

@@ -124,6 +124,19 @@ function test_bitpos()
   EXPECTED="3"
   [ "$FOUND" == "$EXPECTED" ]
 }
+function test_memory()
+{
+  echo "test_memory"
+  FOUND=$(echo "FLUSHDB" | redis-cli)
+  FOUND=$(echo "INFO memory" | redis-cli | grep --color=no "used_memory:" | sed 's/\r//g')
+  EXPECTED="used_memory:827376"
+  [ "$FOUND" == "$EXPECTED" ]
+
+  FOUND=$(echo "R.SETBIT test_memory 0 1" | redis-cli)
+  FOUND=$(echo "INFO memory" | redis-cli | grep --color=no "used_memory:" | sed 's/\r//g')
+  EXPECTED="used_memory:827480"
+  [ "$FOUND" == "$EXPECTED" ]
+}
 function test_done()
 {
   echo "All integration tests passed"
@@ -134,4 +147,5 @@ test_rsetbit_rgetbit_wrong_arity
 test_rbitop
 test_bitcount
 test_bitpos
+test_memory
 test_done