diff --git a/src/plugins/autotest/gtest/gtesttreeitem.cpp b/src/plugins/autotest/gtest/gtesttreeitem.cpp
index f05dcae9b7d..b24f57f6943 100644
--- a/src/plugins/autotest/gtest/gtesttreeitem.cpp
+++ b/src/plugins/autotest/gtest/gtesttreeitem.cpp
@@ -202,7 +202,7 @@ static void collectTestInfo(const GTestTreeItem *item,
     QTC_ASSERT(item, return);
     if (item->type() == TestTreeItem::GroupNode) {
         for (int row = 0, count = item->childCount(); row < count; ++row) {
-            auto child = static_cast<const GTestTreeItem *>(item->childItem(row));
+            auto child = static_cast<const GTestTreeItem *>(item->childAt(row));
             collectTestInfo(child, testCasesForProFile, ignoreCheckState);
         }
         return;
@@ -211,22 +211,21 @@ static void collectTestInfo(const GTestTreeItem *item,
     QTC_ASSERT(childCount != 0, return);
     QTC_ASSERT(item->type() == TestTreeItem::TestCase, return);
     if (ignoreCheckState || item->checked() == Qt::Checked) {
-        const QString &projectFile = item->childItem(0)->proFile();
+        const QString &projectFile = item->childAt(0)->proFile();
         testCasesForProFile[projectFile].filters.append(
                     gtestFilter(item->state()).arg(item->name()).arg('*'));
         testCasesForProFile[projectFile].testSetCount += childCount - 1;
         testCasesForProFile[projectFile].internalTargets.unite(item->internalTargets());
     } else if (item->checked() == Qt::PartiallyChecked) {
-        for (int childRow = 0; childRow < childCount; ++childRow) {
-            const TestTreeItem *child = item->childItem(childRow);
-            QTC_ASSERT(child->type() == TestTreeItem::TestFunctionOrSet, continue);
+        item->forFirstLevelChildren([&testCasesForProFile, item](TestTreeItem *child){
+            QTC_ASSERT(child->type() == TestTreeItem::TestFunctionOrSet, return);
             if (child->checked() == Qt::Checked) {
                 testCasesForProFile[child->proFile()].filters.append(
                             gtestFilter(item->state()).arg(item->name()).arg(child->name()));
                 testCasesForProFile[child->proFile()].internalTargets.unite(
                             child->internalTargets());
             }
-        }
+        });
     }
 }
 
@@ -239,7 +238,7 @@ QList<TestConfiguration *> GTestTreeItem::getTestConfigurations(bool ignoreCheck
 
     QHash<QString, TestCases> testCasesForProFile;
     for (int row = 0, count = childCount(); row < count; ++row) {
-        auto child = static_cast<const GTestTreeItem *>(childItem(row));
+        auto child = static_cast<const GTestTreeItem *>(childAt(row));
         collectTestInfo(child, testCasesForProFile, ignoreCheckState);
     }
 
@@ -376,7 +375,7 @@ TestTreeItem *GTestTreeItem::createParentGroupNode() const
         return new GTestTreeItem(base.baseName(), fileInfo.absolutePath(), TestTreeItem::GroupNode);
     } else { // GTestFilter
         QTC_ASSERT(childCount(), return nullptr); // paranoia
-        const TestTreeItem *firstChild = childItem(0);
+        const TestTreeItem *firstChild = childAt(0);
         const QString activeFilter = GTestFramework::currentGTestFilter();
         const QString fullTestName = name() + '.' + firstChild->name();
         const QString groupNodeName =
@@ -404,11 +403,9 @@ TestTreeItem *GTestTreeItem::findChildByNameStateAndFile(const QString &name,
                                                          GTestTreeItem::TestStates state,
                                                          const QString &proFile) const
 {
-    return findChildBy([name, state, proFile](const TestTreeItem *other) -> bool {
+    return findFirstLevelChild([name, state, proFile](const TestTreeItem *other) {
         const GTestTreeItem *gtestItem = static_cast<const GTestTreeItem *>(other);
-        return other->proFile() == proFile
-                && other->name() == name
-                && gtestItem->state() == state;
+        return other->proFile() == proFile && other->name() == name && gtestItem->state() == state;
     });
 }
 
@@ -461,7 +458,7 @@ bool GTestTreeItem::isGroupNodeFor(const TestTreeItem *other) const
         if (other->type() == TestCase) {
             fullName = other->name();
             if (other->childCount())
-                fullName += '.' + other->childItem(0)->name();
+                fullName += '.' + other->childAt(0)->name();
         } else if (other->type() == TestFunctionOrSet) {
             QTC_ASSERT(other->parentItem(), return false);
             fullName = other->parentItem()->name() + '.' + other->name();
@@ -489,7 +486,7 @@ TestTreeItem *GTestTreeItem::applyFilters()
     const QString gtestFilter = GTestFramework::currentGTestFilter();
     TestTreeItem *filtered = nullptr;
     for (int row = childCount() - 1; row >= 0; --row) {
-        GTestTreeItem *child = static_cast<GTestTreeItem *>(childItem(row));
+        GTestTreeItem *child = static_cast<GTestTreeItem *>(childAt(row));
         if (!matchesFilter(gtestFilter, name() + '.' + child->name())) {
             if (!filtered) {
                 filtered = copyWithoutChildren();
diff --git a/src/plugins/autotest/qtest/qttest_utils.cpp b/src/plugins/autotest/qtest/qttest_utils.cpp
index a832a093ce0..321cba252b0 100644
--- a/src/plugins/autotest/qtest/qttest_utils.cpp
+++ b/src/plugins/autotest/qtest/qttest_utils.cpp
@@ -50,17 +50,14 @@ QHash<QString, QString> testCaseNamesForFiles(const Core::Id &id, const QStringL
     TestTreeItem *rootNode = TestFrameworkManager::instance()->rootNodeForTestFramework(id);
     QTC_ASSERT(rootNode, return result);
 
-    for (int row = 0, rootCount = rootNode->childCount(); row < rootCount; ++row) {
-        const TestTreeItem *child = rootNode->childItem(row);
-        if (files.contains(child->filePath())) {
+    rootNode->forFirstLevelChildren([&result, &files](TestTreeItem *child) {
+        if (files.contains(child->filePath()))
             result.insert(child->filePath(), child->name());
-        }
-        for (int childRow = 0, count = child->childCount(); childRow < count; ++childRow) {
-            const TestTreeItem *grandChild = child->childItem(childRow);
+        child->forFirstLevelChildren([&result, &files, child](TestTreeItem *grandChild) {
             if (files.contains(grandChild->filePath()))
                 result.insert(grandChild->filePath(), child->name());
-        }
-    }
+        });
+    });
     return result;
 }
 
@@ -70,18 +67,17 @@ QMultiHash<QString, QString> alternativeFiles(const Core::Id &id, const QStringL
     TestTreeItem *rootNode = TestFrameworkManager::instance()->rootNodeForTestFramework(id);
     QTC_ASSERT(rootNode, return result);
 
-    for (int row = 0, rootCount = rootNode->childCount(); row < rootCount; ++row) {
-        const TestTreeItem *child = rootNode->childItem(row);
+    rootNode->forFirstLevelChildren([&result, &files](TestTreeItem *child) {
         const QString &baseFilePath = child->filePath();
         for (int childRow = 0, count = child->childCount(); childRow < count; ++childRow) {
-            auto grandChild = static_cast<const QtTestTreeItem *>(child->childItem(childRow));
+            auto grandChild = static_cast<const QtTestTreeItem *>(child->childAt(childRow));
             const QString &filePath = grandChild->filePath();
             if (grandChild->inherited() && baseFilePath != filePath && files.contains(filePath)) {
                 if (!result.contains(filePath, baseFilePath))
                     result.insert(filePath, baseFilePath);
             }
         }
-    }
+    });
     return result;
 }
 
diff --git a/src/plugins/autotest/qtest/qttesttreeitem.cpp b/src/plugins/autotest/qtest/qttesttreeitem.cpp
index 04c0d9c129a..46a2ca03e92 100644
--- a/src/plugins/autotest/qtest/qttesttreeitem.cpp
+++ b/src/plugins/autotest/qtest/qttesttreeitem.cpp
@@ -153,7 +153,7 @@ static void fillTestConfigurationsFromCheckState(const TestTreeItem *item,
     QTC_ASSERT(item, return);
     if (item->type() == TestTreeItem::GroupNode) {
         for (int row = 0, count = item->childCount(); row < count; ++row)
-            fillTestConfigurationsFromCheckState(item->childItem(row), testConfigurations);
+            fillTestConfigurationsFromCheckState(item->childAt(row), testConfigurations);
         return;
     }
     QTC_ASSERT(item->type() == TestTreeItem::TestCase, return);
@@ -168,22 +168,18 @@ static void fillTestConfigurationsFromCheckState(const TestTreeItem *item,
         return;
     case Qt::PartiallyChecked:
     default:
-        int grandChildCount = item->childCount();
         QStringList testCases;
-        for (int grandChildRow = 0; grandChildRow < grandChildCount; ++grandChildRow) {
-            const TestTreeItem *grandChild = item->childItem(grandChildRow);
+        item->forFirstLevelChildren([&testCases](TestTreeItem *grandChild) {
             if (grandChild->checked() == Qt::Checked) {
                 testCases << grandChild->name();
             } else if (grandChild->checked() == Qt::PartiallyChecked) {
-                const int dtCount = grandChild->childCount();
                 const QString funcName = grandChild->name();
-                for (int dtRow = 0; dtRow < dtCount; ++dtRow) {
-                    const TestTreeItem *dataTag = grandChild->childItem(dtRow);
+                grandChild->forFirstLevelChildren([&testCases, &funcName](TestTreeItem *dataTag) {
                     if (dataTag->checked() == Qt::Checked)
                         testCases << funcName + ':' + dataTag->name();
-                }
+                });
             }
-        }
+        });
 
         testConfig = new QtTestConfiguration();
         testConfig->setTestCases(testCases);
@@ -210,22 +206,19 @@ QList<TestConfiguration *> QtTestTreeItem::getAllTestConfigurations() const
     if (!project || type() != Root)
         return result;
 
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        const TestTreeItem *child = childItem(row);
-        TestConfiguration *tc = nullptr;
+    forFirstLevelChildren([&result](TestTreeItem *child) {
         if (child->type() == TestCase) {
-            tc = child->testConfiguration();
-            QTC_ASSERT(tc, continue);
+            TestConfiguration *tc = child->testConfiguration();
+            QTC_ASSERT(tc, return);
             result << tc;
         } else if (child->type() == GroupNode) {
-            const int groupChildCount = child->childCount();
-            for (int groupChildRow = 0; groupChildRow < groupChildCount; ++groupChildRow) {
-                tc = child->childItem(groupChildRow)->testConfiguration();
-                QTC_ASSERT(tc, continue);
+            child->forFirstLevelChildren([&result](TestTreeItem *groupChild) {
+                TestConfiguration *tc = groupChild->testConfiguration();
+                QTC_ASSERT(tc, return);
                 result << tc;
-            }
+            });
         }
-    }
+    });
     return result;
 }
 
@@ -237,7 +230,7 @@ QList<TestConfiguration *> QtTestTreeItem::getSelectedTestConfigurations() const
         return result;
 
     for (int row = 0, count = childCount(); row < count; ++row)
-        fillTestConfigurationsFromCheckState(childItem(row), result);
+        fillTestConfigurationsFromCheckState(childAt(row), result);
 
     return result;
 }
@@ -251,7 +244,7 @@ TestTreeItem *QtTestTreeItem::find(const TestParseResult *result)
         if (TestFrameworkManager::instance()->groupingEnabled(result->frameworkId)) {
             const QString path = QFileInfo(result->fileName).absolutePath();
             for (int row = 0; row < childCount(); ++row) {
-                TestTreeItem *group = childItem(row);
+                TestTreeItem *group = childAt(row);
                 if (group->filePath() != path)
                     continue;
                 if (auto groupChild = group->findChildByFile(result->fileName))
@@ -326,7 +319,7 @@ TestTreeItem *QtTestTreeItem::createParentGroupNode() const
 
 TestTreeItem *QtTestTreeItem::findChildByNameAndInheritance(const QString &name, bool inherited) const
 {
-    return findChildBy([name, inherited](const TestTreeItem *other) -> bool {
+    return findFirstLevelChild([name, inherited](const TestTreeItem *other) {
         const QtTestTreeItem *qtOther = static_cast<const QtTestTreeItem *>(other);
         return qtOther->inherited() == inherited && qtOther->name() == name;
     });
diff --git a/src/plugins/autotest/quick/quicktest_utils.cpp b/src/plugins/autotest/quick/quicktest_utils.cpp
index 2e7c4f1594e..81657e25c0d 100644
--- a/src/plugins/autotest/quick/quicktest_utils.cpp
+++ b/src/plugins/autotest/quick/quicktest_utils.cpp
@@ -51,24 +51,22 @@ QHash<QString, QString> proFilesForQmlFiles(const Core::Id &id, const QStringLis
     if (files.isEmpty())
         return result;
 
-    for (int row = 0, rootCount = rootNode->childCount(); row < rootCount; ++row) {
-        const TestTreeItem *child = rootNode->childItem(row);
+    rootNode->forFirstLevelChildren([&result, &files](TestTreeItem *child) {
         const QString &file = child->filePath();
         if (!file.isEmpty() && files.contains(file)) {
             const QString &proFile = child->proFile();
             if (!proFile.isEmpty())
                 result.insert(file, proFile);
         }
-        for (int subRow = 0, subCount = child->childCount(); subRow < subCount; ++subRow) {
-            const TestTreeItem *grandChild = child->childItem(subRow);
+        child->forFirstLevelChildren([&result, &files](TestTreeItem *grandChild) {
             const QString &file = grandChild->filePath();
             if (!file.isEmpty() && files.contains(file)) {
                 const QString &proFile = grandChild->proFile();
                 if (!proFile.isEmpty())
                     result.insert(file, proFile);
             }
-        }
-    }
+        });
+    });
     return result;
 }
 
diff --git a/src/plugins/autotest/quick/quicktesttreeitem.cpp b/src/plugins/autotest/quick/quicktesttreeitem.cpp
index 69f3cdc8447..6c0c4b4feb9 100644
--- a/src/plugins/autotest/quick/quicktesttreeitem.cpp
+++ b/src/plugins/autotest/quick/quicktesttreeitem.cpp
@@ -130,13 +130,12 @@ TestConfiguration *QuickTestTreeItem::testConfiguration() const
     QuickTestConfiguration *config = nullptr;
     switch (type()) {
     case TestCase: {
+        const QString testName = name();
         QStringList testFunctions;
-        for (int row = 0, count = childCount(); row < count; ++row) {
-            const TestTreeItem *child = childItem(row);
-            if (child->type() == TestTreeItem::TestSpecialFunction)
-                continue;
-            testFunctions << name() + "::" + child->name();
-        }
+        forFirstLevelChildren([&testFunctions, &testName](TestTreeItem *child) {
+            if (child->type() == TestTreeItem::TestFunctionOrSet)
+                testFunctions << testName + "::" + child->name();
+        });
         config = new QuickTestConfiguration;
         config->setTestCases(testFunctions);
         config->setProjectFile(proFile());
@@ -166,7 +165,7 @@ static void testConfigurationFromCheckState(const TestTreeItem *item,
     QTC_ASSERT(item, return);
     if (item->type() == TestTreeItem::GroupNode) {
         for (int row = 0, count = item->childCount(); row < count; ++row)
-            testConfigurationFromCheckState(item->childItem(row), foundProFiles);
+            testConfigurationFromCheckState(item->childAt(row), foundProFiles);
         return;
     }
     QTC_ASSERT(item->type() == TestTreeItem::TestCase, return);
@@ -174,14 +173,12 @@ static void testConfigurationFromCheckState(const TestTreeItem *item,
     if (item->checked() == Qt::Unchecked)
         return;
 
+    const QString testName = item->name();
     QStringList testFunctions;
-    const int childCount = item->childCount();
-    for (int childRow = 0; childRow < childCount; ++childRow) {
-        const TestTreeItem *child = item->childItem(childRow);
-        if (child->checked() != Qt::Checked || child->type() != TestTreeItem::TestFunctionOrSet)
-            continue;
-        testFunctions << item->name() + "::" + child->name();
-    }
+    item->forFirstLevelChildren([&testFunctions, &testName](TestTreeItem *child) {
+        if (child->checked() == Qt::Checked && child->type() == TestTreeItem::TestFunctionOrSet)
+            testFunctions << testName + "::" + child->name();
+    });
     if (foundProFiles.contains(item->proFile())) {
         tc = foundProFiles[item->proFile()];
         QStringList oldFunctions(tc->testCases());
@@ -225,29 +222,25 @@ QList<TestConfiguration *> QuickTestTreeItem::getAllTestConfigurations() const
         return result;
 
     QHash<QString, Tests> testsForProfile;
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        const TestTreeItem *child = childItem(row);
+    forFirstLevelChildren([&testsForProfile](TestTreeItem *child) {
         // unnamed Quick Tests must be handled separately
         if (child->name().isEmpty()) {
-            for (int childRow = 0, ccount = child->childCount(); childRow < ccount; ++ childRow) {
-                const TestTreeItem *grandChild = child->childItem(childRow);
+            child->forFirstLevelChildren([&testsForProfile](TestTreeItem *grandChild) {
                 const QString &proFile = grandChild->proFile();
                 ++(testsForProfile[proFile].testCount);
                 testsForProfile[proFile].internalTargets = grandChild->internalTargets();
-            }
-            continue;
+            });
+            return;
         }
         // named Quick Test
         if (child->type() == TestCase) {
             addTestsForItem(testsForProfile[child->proFile()], child);
         } else if (child->type() == GroupNode) {
-            const int groupCount = child->childCount();
-            for (int groupRow = 0; groupRow < groupCount; ++groupRow) {
-                const TestTreeItem *grandChild = child->childItem(groupRow);
+            child->forFirstLevelChildren([&testsForProfile](TestTreeItem *grandChild) {
                 addTestsForItem(testsForProfile[grandChild->proFile()], grandChild);
-            }
+            });
         }
-    }
+    });
     // create TestConfiguration for each project file
     for (auto it = testsForProfile.begin(), end = testsForProfile.end(); it != end; ++it) {
         QuickTestConfiguration *tc = new QuickTestConfiguration;
@@ -269,15 +262,11 @@ QList<TestConfiguration *> QuickTestTreeItem::getSelectedTestConfigurations() co
 
     QHash<QString, QuickTestConfiguration *> foundProFiles;
 
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        const TestTreeItem *child = childItem(row);
-        // unnamed Quick Tests cannot get selected explicitly
-        if (child->name().isEmpty())
-            continue;
-
-        // named Quick Tests
-        testConfigurationFromCheckState(child, foundProFiles);
-    }
+    forFirstLevelChildren([&foundProFiles](TestTreeItem *child) {
+        // unnamed Quick Tests cannot get selected explicitly - only handle named Quick Tests
+        if (!child->name().isEmpty())
+            testConfigurationFromCheckState(child, foundProFiles);
+    });
 
     for (auto it = foundProFiles.begin(), end = foundProFiles.end(); it != end; ++it) {
         QuickTestConfiguration *config = it.value();
@@ -300,14 +289,10 @@ TestTreeItem *QuickTestTreeItem::find(const TestParseResult *result)
             return unnamedQuickTests();
         if (TestFrameworkManager::instance()->groupingEnabled(result->frameworkId)) {
             const QString path = QFileInfo(result->fileName).absolutePath();
-            for (int row = 0; row < childCount(); ++row) {
-                TestTreeItem *group = childItem(row);
-                if (group->filePath() != path)
-                    continue;
-                if (auto groupChild = group->findChildByFile(result->fileName))
-                    return groupChild;
-            }
-            return nullptr;
+            TestTreeItem *group = findFirstLevelChild([path](TestTreeItem *group) {
+                    return group->filePath() == path;
+            });
+            return group ? group->findChildByFile(result->fileName) : nullptr;
         }
         return findChildByFile(result->fileName);
     case GroupNode:
@@ -416,12 +401,7 @@ TestTreeItem *QuickTestTreeItem::unnamedQuickTests() const
     if (type() != Root)
         return nullptr;
 
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        TestTreeItem *child = childItem(row);
-        if (child->name().isEmpty())
-            return child;
-    }
-    return nullptr;
+    return findFirstLevelChild([](TestTreeItem *child) { return child->name().isEmpty(); });
 }
 
 } // namespace Internal
diff --git a/src/plugins/autotest/testtreeitem.cpp b/src/plugins/autotest/testtreeitem.cpp
index 9d42858a99c..3d07c8076d4 100644
--- a/src/plugins/autotest/testtreeitem.cpp
+++ b/src/plugins/autotest/testtreeitem.cpp
@@ -191,17 +191,16 @@ void TestTreeItem::markForRemovalRecursively(bool mark)
 {
     markForRemoval(mark);
     for (int row = 0, count = childCount(); row < count; ++row)
-        childItem(row)->markForRemovalRecursively(mark);
+        childAt(row)->markForRemovalRecursively(mark);
 }
 
 void TestTreeItem::markForRemovalRecursively(const QString &filePath)
 {
     bool mark = m_filePath == filePath;
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        TestTreeItem *child = childItem(row);
+    forFirstLevelChildren([&mark, &filePath](TestTreeItem *child) {
         child->markForRemovalRecursively(filePath);
         mark &= child->markedForRemoval();
-    }
+    });
     markForRemoval(mark);
 }
 
@@ -210,35 +209,28 @@ TestTreeItem *TestTreeItem::parentItem() const
     return static_cast<TestTreeItem *>(parent());
 }
 
-TestTreeItem *TestTreeItem::childItem(int row) const
-{
-    return static_cast<TestTreeItem *>(childAt(row));
-}
-
 TestTreeItem *TestTreeItem::findChildByName(const QString &name)
 {
-    return findChildBy([name](const TestTreeItem *other) -> bool {
-        return other->name() == name;
-    });
+    return findFirstLevelChild([name](const TestTreeItem *other) { return other->name() == name; });
 }
 
 TestTreeItem *TestTreeItem::findChildByFile(const QString &filePath)
 {
-    return findChildBy([filePath](const TestTreeItem *other) -> bool {
+    return findFirstLevelChild([filePath](const TestTreeItem *other) {
         return other->filePath() == filePath;
     });
 }
 
 TestTreeItem *TestTreeItem::findChildByFileAndType(const QString &filePath, Type tType)
 {
-    return findChildBy([filePath, tType](const TestTreeItem *other) {
+    return findFirstLevelChild([filePath, tType](const TestTreeItem *other) {
         return other->type() == tType && other->filePath() == filePath;
     });
 }
 
 TestTreeItem *TestTreeItem::findChildByNameAndFile(const QString &name, const QString &filePath)
 {
-    return findChildBy([name, filePath](const TestTreeItem *other) -> bool {
+    return findFirstLevelChild([name, filePath](const TestTreeItem *other) {
         return other->filePath() == filePath && other->name() == name;
     });
 }
@@ -353,16 +345,6 @@ inline bool TestTreeItem::modifyName(const QString &name)
     return false;
 }
 
-TestTreeItem *TestTreeItem::findChildBy(CompareFunction compare) const
-{
-    for (int row = 0, count = childCount(); row < count; ++row) {
-        TestTreeItem *child = childItem(row);
-        if (compare(child))
-            return child;
-    }
-    return nullptr;
-}
-
 /*
  * try to find build system target that depends on the given file - if the file is no header
  * try to find the corresponding header and use this instead to find the respective target
diff --git a/src/plugins/autotest/testtreeitem.h b/src/plugins/autotest/testtreeitem.h
index d47097efba2..0180c88fefe 100644
--- a/src/plugins/autotest/testtreeitem.h
+++ b/src/plugins/autotest/testtreeitem.h
@@ -49,7 +49,7 @@ namespace Internal {
 class TestParseResult;
 class TestConfiguration;
 enum class TestRunMode;
-class TestTreeItem : public Utils::TreeItem
+class TestTreeItem : public Utils::TypedTreeItem<TestTreeItem>
 {
 public:
 
@@ -100,7 +100,6 @@ public:
     bool markedForRemoval() const { return m_status == MarkedForRemoval; }
     bool newlyAdded() const { return m_status == NewlyAdded; }
     TestTreeItem *parentItem() const;
-    TestTreeItem *childItem(int row) const;
 
     TestTreeItem *findChildByName(const QString &name);
     TestTreeItem *findChildByFile(const QString &filePath);
@@ -127,7 +126,6 @@ public:
 protected:
     void copyBasicDataFrom(const TestTreeItem *other);
     typedef std::function<bool(const TestTreeItem *)> CompareFunction;
-    TestTreeItem *findChildBy(CompareFunction compare) const;
     static QSet<QString> dependingInternalTargets(CppTools::CppModelManager *cppMM,
                                                   const QString &file);
 
diff --git a/src/plugins/autotest/testtreemodel.cpp b/src/plugins/autotest/testtreemodel.cpp
index 24cb7fa8c27..ef7a30c4c91 100644
--- a/src/plugins/autotest/testtreemodel.cpp
+++ b/src/plugins/autotest/testtreemodel.cpp
@@ -162,29 +162,22 @@ QList<TestTreeItem *> TestTreeModel::testItemsByName(TestTreeItem *root, const Q
 {
     QList<TestTreeItem *> result;
 
-    for (int row = 0, count = root->childCount(); row < count; ++row){
-        TestTreeItem *node = root->childItem(row);
-
+    root->forFirstLevelChildren([&testName, &result, this](TestTreeItem *node) {
         if (node->type() == TestTreeItem::TestCase) {
             if (node->name() == testName) {
                 result << node;
-                continue; // prioritize Tests over TestCases
+                return; // prioritize Tests over TestCases
             }
-
-            TestTreeItem *testCase = node->findChildBy([testName](const TestTreeItem *it) {
+            TestTreeItem *testCase = node->findFirstLevelChild([&testName](TestTreeItem *it) {
                 QTC_ASSERT(it, return false);
                 return it->type() == TestTreeItem::TestFunctionOrSet && it->name() == testName;
-            }); // collect only actual tests, not special functions like init, cleanup etc,
-
-            if (!testCase)
-                continue;
-
-            result << testCase;
+            }); // collect only actual tests, not special functions like init, cleanup etc.
+            if (testCase)
+                result << testCase;
         } else {
             result << testItemsByName(node, testName);
         }
-    }
-
+    });
     return result;
 }
 
@@ -229,12 +222,12 @@ void TestTreeModel::rebuild(const QList<Core::Id> &frameworkIds)
         TestTreeItem *frameworkRoot = frameworkManager->rootNodeForTestFramework(id);
         const bool groupingEnabled = TestFrameworkManager::instance()->groupingEnabled(id);
         for (int row = frameworkRoot->childCount() - 1; row >= 0; --row) {
-            auto testItem = frameworkRoot->childItem(row);
+            auto testItem = frameworkRoot->childAt(row);
             if (testItem->type() == TestTreeItem::GroupNode) {
                 // process children of group node and delete it afterwards if necessary
                 for (int childRow = testItem->childCount() - 1; childRow >= 0; --childRow) {
                     // FIXME should this be done recursively until we have a non-GroupNode?
-                    TestTreeItem *childTestItem = testItem->childItem(childRow);
+                    TestTreeItem *childTestItem = testItem->childAt(childRow);
                     takeItem(childTestItem);
                     filterAndInsert(childTestItem, frameworkRoot, groupingEnabled);
                 }
@@ -272,7 +265,7 @@ void TestTreeModel::markForRemoval(const QString &filePath)
     for (Utils::TreeItem *frameworkRoot : *rootItem()) {
         TestTreeItem *root = static_cast<TestTreeItem *>(frameworkRoot);
         for (int childRow = root->childCount() - 1; childRow >= 0; --childRow) {
-            TestTreeItem *child = root->childItem(childRow);
+            TestTreeItem *child = root->childAt(childRow);
             child->markForRemovalRecursively(filePath);
         }
     }
@@ -300,7 +293,7 @@ bool TestTreeModel::sweepChildren(TestTreeItem *item)
 {
     bool hasChanged = false;
     for (int row = item->childCount() - 1; row >= 0; --row) {
-        TestTreeItem *child = item->childItem(row);
+        TestTreeItem *child = item->childAt(row);
 
         if (child->type() != TestTreeItem::Root && child->markedForRemoval()) {
             destroyItem(child);
@@ -324,7 +317,7 @@ static TestTreeItem *fullCopyOf(TestTreeItem *other)
     QTC_ASSERT(other, return nullptr);
     TestTreeItem *result = other->copyWithoutChildren();
     for (int row = 0, count = other->childCount(); row < count; ++row)
-        result->appendChild(fullCopyOf(other->childItem(row)));
+        result->appendChild(fullCopyOf(other->childAt(row)));
     return result;
 }
 
@@ -346,7 +339,7 @@ void TestTreeModel::insertItemInParent(TestTreeItem *item, TestTreeItem *root, b
 {
     TestTreeItem *parentNode = root;
     if (groupingEnabled) {
-        parentNode = root->findChildBy([item] (const TestTreeItem *it) {
+        parentNode = root->findFirstLevelChild([item] (const TestTreeItem *it) {
             return it->isGroupNodeFor(item);
         });
         if (!parentNode) {
@@ -361,7 +354,7 @@ void TestTreeModel::insertItemInParent(TestTreeItem *item, TestTreeItem *root, b
     if (auto otherItem = parentNode->findChild(item)) {
         // only handle item's children and add them to the already present one
         for (int row = 0, count = item->childCount(); row < count; ++row) {
-            TestTreeItem *child = fullCopyOf(item->childItem(row));
+            TestTreeItem *child = fullCopyOf(item->childAt(row));
             applyParentCheckState(otherItem, child);
             otherItem->appendChild(child);
         }
@@ -388,7 +381,7 @@ void TestTreeModel::revalidateCheckState(TestTreeItem *item)
     bool foundUnchecked = false;
     bool foundPartiallyChecked = false;
     for (int row = 0, count = item->childCount(); row < count; ++row) {
-        TestTreeItem *child = item->childItem(row);
+        TestTreeItem *child = item->childAt(row);
         switch (child->type()) {
         case TestTreeItem::TestDataFunction:
         case TestTreeItem::TestSpecialFunction:
@@ -507,7 +500,7 @@ int TestTreeModel::autoTestsCount() const
 bool TestTreeModel::hasUnnamedQuickTests(const TestTreeItem *rootNode) const
 {
     for (int row = 0, count = rootNode->childCount(); row < count; ++row) {
-        if (rootNode->childItem(row)->name().isEmpty())
+        if (rootNode->childAt(row)->name().isEmpty())
             return true;
     }
     return false;
@@ -519,12 +512,7 @@ TestTreeItem *TestTreeModel::unnamedQuickTests() const
     if (!rootNode)
         return nullptr;
 
-    for (int row = 0, count = rootNode->childCount(); row < count; ++row) {
-        TestTreeItem *child = rootNode->childItem(row);
-        if (child->name().isEmpty())
-            return child;
-    }
-    return nullptr;
+    return rootNode->findFirstLevelChild([](TestTreeItem *it) { return it->name().isEmpty(); });
 }
 
 int TestTreeModel::namedQuickTestsCount() const
@@ -549,11 +537,11 @@ int TestTreeModel::dataTagsCount() const
         return 0;
 
     int dataTagCount = 0;
-    for (Utils::TreeItem *item : *rootNode) {
-        TestTreeItem *classItem = static_cast<TestTreeItem *>(item);
-        for (Utils::TreeItem *functionItem : *classItem)
+    rootNode->forFirstLevelChildren([&dataTagCount](TestTreeItem *classItem) {
+        classItem->forFirstLevelChildren([&dataTagCount](TestTreeItem *functionItem) {
             dataTagCount += functionItem->childCount();
-   }
+        });
+    });
     return dataTagCount;
 }
 
@@ -568,10 +556,9 @@ QMultiMap<QString, int> TestTreeModel::gtestNamesAndSets() const
     QMultiMap<QString, int> result;
 
     if (TestTreeItem *rootNode = gtestRootNode()) {
-        for (int row = 0, count = rootNode->childCount(); row < count; ++row) {
-            const TestTreeItem *current = rootNode->childItem(row);
-            result.insert(current->name(), current->childCount());
-        }
+        rootNode->forFirstLevelChildren([&result](TestTreeItem *child) {
+            result.insert(child->name(), child->childCount());
+        });
     }
     return result;
 }