Add some tests

cmake/modules/Findcmocka.cmake

@@ -0,0 +1,14 @@
+# Copyright (c) 2026 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+include(FetchContent)
+FetchContent_Declare(
+  cmocka
+  GIT_REPOSITORY https://gitlab.com/cmocka/cmocka.git
+  GIT_TAG       cmocka-2.0.1
+)
+
+FetchContent_MakeAvailable(cmocka)
+set(cmocka_FOUND ON)

cmake/modules/dusktest.cmake

@@ -0,0 +1,32 @@
+# Copyright (c) 2026 Dominic Masters
+# 
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+find_package(cmocka REQUIRED)
+
+# Function to create a test executable from a single .c file
+function(dusktest TEST_C_FILE)
+  # Create target name from file name
+  get_filename_component(TEST_NAME ${TEST_C_FILE} NAME_WE)
+
+  # Create the executable target
+  add_executable(${TEST_NAME})
+
+  # Setup some compiler definitions.
+  target_compile_definitions(${TEST_NAME} PRIVATE
+    DUSK_TEST_ASSERT=1
+  )
+
+  # Add the test file
+  target_sources(${TEST_NAME} PRIVATE ${TEST_C_FILE})
+
+  # Add sources, both common and test-specific
+  target_include_directories(${TEST_NAME} PUBLIC ${CMAKE_CURRENT_LIST_DIR} ${DUSK_TEST_DIR})
+
+  # Link against DuskCore and cmocka
+  target_link_libraries(${TEST_NAME} PUBLIC ${DUSK_LIBRARY_TARGET_NAME} cmocka)
+
+  # Add as a CTest
+  add_test(NAME ${TEST_NAME} COMMAND ${TEST_NAME})
+endfunction()