Declare some global items for future testing (project-chip#34509)

Co-authored-by: Andrei Litvin <andreilitvin@google.com>

Author: andy31415

src/app/zap-templates/zcl/data-model/chip/global-structs.xml

@@ -31,4 +31,25 @@ TODO: Make these structures global rather than defining them for each cluster.
     <item fieldId="1" name="FloorNumber"     type="int16s"                   isNullable="true"  optional="false"/>
     <item fieldId="2" name="AreaType"        type="AreaTypeTag"              isNullable="true"  optional="false"/>
   </struct>
+
+  <!--
+    These are test global items (no cluster attached) for testing only.
+    Their usage is defined for UnitTestCluster only.
+  -->
+  <bitmap name="TestGlobalBitmap" type="bitmap32">
+    <field mask="0x01" name="FirstBit" />
+    <field mask="0x02" name="SecondBit" />
+  </bitmap>
+
+  <enum name="TestGlobalEnum" type="enum8">
+    <item name="SomeValue" value="0x00"/>
+    <item name="SomeOtherValue" value="0x01"/>
+    <item name="FinalValue" value="0x02"/>
+  </enum>
+
+  <struct name="TestGlobalStruct">
+    <item fieldId="0" name="Name" type="char_string" length="128" isNullable="false" optional="false"/>
+    <item fieldId="1" name="MyBitmap" type="TestGlobalBitmap" isNullable="true" optional="false"/>
+    <item fieldId="2" name="MyEnum" type="TestGlobalEnum" isNullable="true" optional="true"/>
+  </struct>
 </configurator>