diff --git a/testdata/umldoc-src/gr/spinellis/invoice/Customer.java b/testdata/umldoc-src/gr/spinellis/invoice/Customer.java
new file mode 100644
index 0000000..97cea0a
--- /dev/null
+++ b/testdata/umldoc-src/gr/spinellis/invoice/Customer.java
@@ -0,0 +1,6 @@
+package gr.spinellis.invoice;
+
+
+public class Customer {
+    String name;
+}
diff --git a/testdata/umldoc-src/gr/spinellis/invoice/Invoice.java b/testdata/umldoc-src/gr/spinellis/invoice/Invoice.java
new file mode 100644
index 0000000..774d936
--- /dev/null
+++ b/testdata/umldoc-src/gr/spinellis/invoice/Invoice.java
@@ -0,0 +1,14 @@
+package gr.spinellis.invoice;
+
+import gr.spinellis.product.Product;
+
+import java.util.Date;
+
+public class Invoice {
+    public double total;
+    public InvoiceItem[] items;
+    public Customer customer;
+    public Date invoiceDate;
+    
+    public void addItem(Product p, int quantity) {};
+}
diff --git a/testdata/umldoc-src/gr/spinellis/invoice/InvoiceItem.java b/testdata/umldoc-src/gr/spinellis/invoice/InvoiceItem.java
new file mode 100644
index 0000000..a7254a2
--- /dev/null
+++ b/testdata/umldoc-src/gr/spinellis/invoice/InvoiceItem.java
@@ -0,0 +1,9 @@
+package gr.spinellis.invoice;
+
+import gr.spinellis.product.Product;
+
+public class InvoiceItem {
+
+    public Product product;
+    public int quantity;
+}
diff --git a/testdata/umldoc-src/gr/spinellis/product/Category.java b/testdata/umldoc-src/gr/spinellis/product/Category.java
new file mode 100644
index 0000000..1398ae6
--- /dev/null
+++ b/testdata/umldoc-src/gr/spinellis/product/Category.java
@@ -0,0 +1,9 @@
+package gr.spinellis.product;
+
+import java.util.List;
+
+public class Category {
+
+    public String name;
+    List<Product> products;
+}
diff --git a/testdata/umldoc-src/gr/spinellis/product/Product.java b/testdata/umldoc-src/gr/spinellis/product/Product.java
new file mode 100644
index 0000000..4b71957
--- /dev/null
+++ b/testdata/umldoc-src/gr/spinellis/product/Product.java
@@ -0,0 +1,10 @@
+package gr.spinellis.product;
+
+public class Product {
+
+    public String name;
+    public int stock;
+    public double price;
+    public Category category;
+
+}