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+# How to build the test widget using app-templates/cmake-apps-module
+
+## Defining CMake targets
+
+Now that the test tree has been created, in each directory you have to create
+a `CMakeLists.txt` file to hold the CMake's target definition. For each target
+you need to specify a **LABELS** depending on the purpose of the files for each
+directory. There are more explanations about using the *cmake-apps-module* (the
+former *app-templates* submodule) in the [documentation website](http://docs.automotivelinux.org/docs/devguides/en/dev/reference/sdk-devkit/docs/part-2/2_4-Use-app-templates.html#using-cmake-template-macros).
+
+Here is a cheat sheet to map the **LABELS** target for each classic test tree
+directory:
+
+* `etc` uses the label **TEST-CONFIG**
+* `fixtures` uses the label **TEST-DATA**
+* `tests` uses the label **TEST-DATA**
+
+i.e for the `etc` folder:
+
+```cmake
+PROJECT_TARGET_ADD(afb-test-config)
+
+    file(GLOB CONF_FILES "*.json")
+
+    add_input_files("${CONF_FILES}")
+
+    SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+        LABELS "TEST-CONFIG"
+        OUTPUT_NAME ${TARGET_NAME}
+    )
+```
+
+> **CAUTION**: make sure that you have CMakeLists files that include your
+> subdirectories target (cf: previous chapter `Write the tests`).
+
+## Build the test widget
+
+By default, the test widget is not built, you have to specify that you want to
+build it or use a special target.
+
+### Building at the same time than classic widget
+
+Specify the option `BUILD_TEST_WGT=TRUE` when you configure your build.
+
+ie:
+
+```bash
+cd build
+cmake -DBUILD_TEST_WIDGET=TRUE ..
+make
+make widget
+```
+
+### Building separately only the test widget
+
+Just use the target `test_widget` after a classic build.
+
+ie:
+
+```bash
+cd build
+cmake ..
+make
+make test_widget
+```