cmake: Mark failing tests as passed.

Check that failing tests are really failing. They fail by intention.
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index 66629db..a060de1 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -10,31 +10,66 @@
 
 add_executable(calculator_test calculator.c calculator_test.c)
 target_link_libraries(calculator_test ${CMOCKA_SHARED_LIBRARY})
+
 add_test(calculator_test ${CMAKE_CURRENT_BINARY_DIR}/calculator_test)
 
 add_executable(allocate_module_test allocate_module.c allocate_module_test.c)
 target_link_libraries(allocate_module_test ${CMOCKA_SHARED_LIBRARY})
+
+# This is a test that should detect leaks and overflows and will fail for that
 add_test(allocate_module_test ${CMAKE_CURRENT_BINARY_DIR}/allocate_module_test)
+set_tests_properties(
+    allocate_module_test
+        PROPERTIES
+        PASS_REGULAR_EXPRESSION
+        "\\[  FAILED  \\] 3 test"
+)
 
 add_executable(assert_macro_test assert_macro.c assert_macro_test.c)
 target_link_libraries(assert_macro_test ${CMOCKA_SHARED_LIBRARY})
+
 add_test(assert_macro_test ${CMAKE_CURRENT_BINARY_DIR}/assert_macro_test)
+set_tests_properties(
+    assert_macro_test
+        PROPERTIES
+        PASS_REGULAR_EXPRESSION
+        "\\[  FAILED  \\] 2 test"
+)
 
 add_executable(assert_module_test assert_module.c assert_module_test.c)
 target_link_libraries(assert_module_test ${CMOCKA_SHARED_LIBRARY})
 
+add_test(assert_module_test ${CMAKE_CURRENT_BINARY_DIR}/assert_macro_test)
+set_tests_properties(
+    assert_module_test
+        PROPERTIES
+        PASS_REGULAR_EXPRESSION
+        "\\[  FAILED  \\] 2 test"
+)
+
 add_executable(customer_database_test customer_database.c customer_database_test.c)
 target_link_libraries(customer_database_test ${CMOCKA_SHARED_LIBRARY})
+
 add_test(customer_database_test ${CMAKE_CURRENT_BINARY_DIR}/customer_database_test)
 
 add_executable(key_value_test key_value.c key_value_test.c)
 target_link_libraries(key_value_test ${CMOCKA_SHARED_LIBRARY})
+
 add_test(key_value_test ${CMAKE_CURRENT_BINARY_DIR}/key_value_test)
 
 add_executable(product_database_test product_database.c product_database_test.c)
 target_link_libraries(product_database_test ${CMOCKA_SHARED_LIBRARY})
+
 add_test(product_database_test ${CMAKE_CURRENT_BINARY_DIR}/product_database_test)
+set_tests_properties(
+    product_database_test
+        PROPERTIES
+        PASS_REGULAR_EXPRESSION
+        "\\[  FAILED  \\] 2 test"
+)
+
 
 add_executable(run_tests run_tests.c)
 target_link_libraries(run_tests ${CMOCKA_SHARED_LIBRARY})
+
 add_test(run_tests ${CMAKE_CURRENT_BINARY_DIR}/run_tests)