doc: add instructions to run tests in user's guide

doc/de/weechat_user.de.adoc

@@ -338,6 +338,27 @@ folgendem Befehl angezeigt werden:
 $ ./configure --help
 ----
 
+// TRANSLATION MISSING
+[[run_tests]]
+==== Run tests
+
+Following packages are *required* to compile tests:
+
+* libcpputest-dev
+* C++ compiler
+
+Tests must be enabled when compiling WeeChat (with cmake):
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+They can be launched after compilation from the build directory (with cmake):
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Git Quellen
 

doc/en/weechat_user.en.adoc

@@ -329,6 +329,26 @@ command:
 $ ./configure --help
 ----
 
+[[run_tests]]
+==== Run tests
+
+Following packages are *required* to compile tests:
+
+* libcpputest-dev
+* C++ compiler
+
+Tests must be enabled when compiling WeeChat (with cmake):
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+They can be launched after compilation from the build directory (with cmake):
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Git sources
 

doc/fr/weechat_user.fr.adoc

@@ -335,6 +335,27 @@ Des options peuvent être utilisées pour le script _configure_, elles peuvent
 $ ./configure --help
 ----
 
+[[run_tests]]
+==== Lancement des tests
+
+Les paquets suivants sont nécessaires pour compiler les tests :
+
+* libcpputest-dev
+* C++ compiler
+
+Les tests doivent être activés pour compiler WeeChat (avec cmake) :
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+Ils peuvent être lancés après compilation depuis le répertoire de construction
+(avec cmake) :
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Sources Git
 

doc/it/weechat_user.it.adoc

@@ -365,6 +365,27 @@ command:
 $ ./configure --help
 ----
 
+// TRANSLATION MISSING
+[[run_tests]]
+==== Run tests
+
+Following packages are *required* to compile tests:
+
+* libcpputest-dev
+* C++ compiler
+
+Tests must be enabled when compiling WeeChat (with cmake):
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+They can be launched after compilation from the build directory (with cmake):
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Sorgenti git
 

doc/ja/weechat_user.ja.adoc

@@ -333,6 +333,27 @@ _configure_
 $ ./configure --help
 ----
 
+// TRANSLATION MISSING
+[[run_tests]]
+==== Run tests
+
+Following packages are *required* to compile tests:
+
+* libcpputest-dev
+* C++ compiler
+
+Tests must be enabled when compiling WeeChat (with cmake):
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+They can be launched after compilation from the build directory (with cmake):
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Git ソース
 

doc/pl/weechat_user.pl.adoc

@@ -338,6 +338,27 @@ za pomocą tej komendy:
 $ ./configure --help
 ----
 
+// TRANSLATION MISSING
+[[run_tests]]
+==== Run tests
+
+Following packages are *required* to compile tests:
+
+* libcpputest-dev
+* C++ compiler
+
+Tests must be enabled when compiling WeeChat (with cmake):
+
+----
+$ cmake .. -DENABLE_TESTS=ON
+----
+
+They can be launched after compilation from the build directory (with cmake):
+
+----
+$ ctest -V
+----
+
 [[git_sources]]
 === Źródła z gita