feat(utils.spec.qml): add a test on `setTimeout`

tests/ui/scripts/Utils/utils.js

@@ -97,7 +97,7 @@ function setTimeout (delay, cb) {
 }
 
 function clearTimeout (timer) {
-  timer.destroy() // Not necessary: `timer.stop()`
+  timer.destroy() // Unnecessary call: `timer.stop()`
 }
 
 // -------------------------------------------------------------------

tests/ui/scripts/Utils/utils.spec.qml

@@ -5,7 +5,11 @@ import QtTest 1.1
 // when tests are executed.
 import './utils.js' as Utils
 
+// ===================================================================
+
 TestCase {
+  id: testCase
+
   name: 'UtilsTests'
 
   function test_snakeToCamel_data () {
@@ -20,4 +24,38 @@ TestCase {
   function test_snakeToCamel (data) {
     compare(Utils.snakeToCamel(data.input), data.output)
   }
+
+  function test_setTimeoutWithoutParent () {
+    try {
+      Utils.setTimeout(0, function () {
+        fail('`setTimeout` was called without parent.')
+      })
+    } catch (e) {
+      compare(e, 'Error: Qt.createQmlObject(): Missing parent object')
+    }
+  }
+
+  function test_setTimeout_data () {
+    return [
+      { time: 0 },
+      { time: 100 }
+    ]
+  }
+
+  function test_setTimeout (data) {
+    var failed = true
+    Utils.setTimeout.call(testCase, data.time, function () {
+      failed = false
+    })
+
+    if (!failed) {
+      fail('`setTimeout` callback was called before `wait`')
+    }
+
+    wait(200)
+
+    if (failed) {
+      fail('`setTimeout` failed because callback it was not called in due course')
+    }
+  }
 }