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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](../../../devguides/reference/cmakeafbtemplates/dev_guide/advanced-usage.html).
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_WGT=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
```
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