diff --git a/core/src/DataSource/DataSourceItem.cpp b/core/src/DataSource/DataSourceItem.cpp
index 919946c..39d6599 100644
--- a/core/src/DataSource/DataSourceItem.cpp
+++ b/core/src/DataSource/DataSourceItem.cpp
@@ -170,7 +170,7 @@ bool DataSourceItem::operator==(const DataSourceItem &other)
     if (std::tie(impl->m_Type, impl->m_Data) == std::tie(other.impl->m_Type, other.impl->m_Data)) {
         // Compares contents of items' children
         return std::equal(std::cbegin(impl->m_Children), std::cend(impl->m_Children),
-                          std::cbegin(other.impl->m_Children),
+                          std::cbegin(other.impl->m_Children), std::cend(other.impl->m_Children),
                           [](const auto &itemChild, const auto &otherChild) {
                               return *itemChild == *otherChild;
                           });
diff --git a/core/tests/DataSource/TestDataSourceItem.cpp b/core/tests/DataSource/TestDataSourceItem.cpp
index c40fb4e..dd998f0 100644
--- a/core/tests/DataSource/TestDataSourceItem.cpp
+++ b/core/tests/DataSource/TestDataSourceItem.cpp
@@ -1,5 +1,7 @@
 #include <DataSource/DataSourceItem.h>
 
+#include "DataSourceItemBuilder.h"
+
 #include <QObject>
 #include <QtTest>
 
@@ -43,7 +45,140 @@ void TestDataSourceItem::testMerge_data()
     QTest::addColumn<std::shared_ptr<DataSourceItem> >("dest");
     QTest::addColumn<std::shared_ptr<DataSourceItem> >("expectedResult");
 
-    /// @todo ALX: adds test cases
+    QTest::newRow("merge (basic case)") << DataSourceItemBuilder{}
+                                               .root("A2")
+                                               .node("- B2")
+                                               .product("-- P2")
+                                               .end() // P2
+                                               .end() // B2
+                                               .end() // A2
+                                               .build()
+                                        << DataSourceItemBuilder{}
+                                               .root("A1")
+                                               .node("- B1")
+                                               .product("-- P1")
+                                               .end() // P1
+                                               .end() // B1
+                                               .end() // A1
+                                               .build()
+                                        << DataSourceItemBuilder{}
+                                               .root("A1")
+                                               .node("- B1")
+                                               .product("-- P1")
+                                               .end() // P1
+                                               .end() // B1
+                                               .node("- B2")
+                                               .product("-- P2")
+                                               .end() // P2
+                                               .end() // B2
+                                               .end() // A1
+                                               .build();
+
+    QTest::newRow("merge (some of the source and destination trees are identical)")
+        << DataSourceItemBuilder{}
+               .root("A2")
+               .node("- B1")
+               .node("-- C1")
+               .product("--- P2")
+               .end() // P2
+               .end() // C1
+               .node("-- C2")
+               .end() // C2
+               .end() // B1
+               .end() // A2
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node("-- C1")
+               .product("--- P1")
+               .end() // P1
+               .end() // C1
+               .end() // B1
+               .end() // A1
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node("-- C1")
+               .product("--- P1")
+               .end() // P1
+               .product("--- P2")
+               .end() // P2
+               .end() // C1
+               .node("-- C2")
+               .end() // C2
+               .end() // B1
+               .end() // A1
+               .build();
+
+    QTest::newRow("merge (products with the same name and tree are kept)")
+        << DataSourceItemBuilder{}
+               .root("A2")
+               .node("- B1")
+               .node("-- C1")
+               .product({{"name", "--- P1"}, {"from", "source"}})
+               .end() // P1
+               .end() // C1
+               .end() // B1
+               .end() // A2
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node("-- C1")
+               .product({{"name", "--- P1"}, {"from", "dest"}})
+               .end() // P1
+               .end() // C1
+               .end() // B1
+               .end() // A1
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node("-- C1")
+               .product({{"name", "--- P1"}, {"from", "dest"}})
+               .end() // P1 (dest)
+               .product({{"name", "--- P1"}, {"from", "source"}})
+               .end() // P1 (source)
+               .end() // C1
+               .end() // B1
+               .end() // A1
+               .build();
+
+    QTest::newRow("merge (for same nodes, metadata of dest node are kept)")
+        << DataSourceItemBuilder{}
+               .root("A2")
+               .node("- B1")
+               .node({{"name", "-- C1"}, {"from", "source"}})
+               .product("--- P2")
+               .end() // P1
+               .end() // C1
+               .end() // B1
+               .end() // A2
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node({{"name", "-- C1"}, {"from", "dest"}})
+               .product("--- P1")
+               .end() // P1
+               .end() // C1
+               .end() // B1
+               .end() // A1
+               .build()
+        << DataSourceItemBuilder{}
+               .root("A1")
+               .node("- B1")
+               .node({{"name", "-- C1"}, {"from", "dest"}})
+               .product("--- P1")
+               .end() // P1
+               .product("--- P2")
+               .end() // P2
+               .end() // C1 (dest)
+               .end() // B1
+               .end() // A1
+               .build();
 }
 
 void TestDataSourceItem::testMerge()