diff --git a/tests/integration/spec.js b/tests/integration/spec.js
index 26841c4..76e4204 100644
--- a/tests/integration/spec.js
+++ b/tests/integration/spec.js
@@ -42,6 +42,10 @@ describe('launch of application', function() {
             .then(function() { return sendCommand('0x1 0xf')})
             .then(function() { return sendCommand('0x1 | 0xf')})
             .then(function() { return sendCommand('0x1 ^ 123')})
+            .then(function() { return sendCommand('em')})
+            .then(function() { return sendCommand('em')})
+            .then(function() { return sendCommand('dark')})
+            .then(function() { return sendCommand('light')})
             .then(assertNoErrors);
     });