Define the tests in tests/CMakeLists.txt

The fixture targets, the test binary, and the six test cases live beside
the sources they build, leaving the top-level file with enable_testing,
the ctest scratch-area write, and the add_subdirectory call.

The paths both files need are set once above that call, so the child's
output directories and the parent's clean rule refer to the same
variables rather than repeating the paths.

tests/CMakeLists.txt

@@ -0,0 +1,66 @@
+# ---------------------------------------------------------------------
+# Test fixture modules: one known-good stub, two deliberately broken
+#
+# The output paths come from the top-level file, which defines them
+# before adding this directory so that each is written in one place.
+# ---------------------------------------------------------------------
+foreach(fixture good missing_symbols bad_version)
+    add_library(fixture_${fixture} MODULE fixtures/src/${fixture}.cpp)
+    set_target_properties(fixture_${fixture} PROPERTIES
+            PREFIX ""
+            SUFFIX ".so"
+            OUTPUT_NAME ${fixture}
+            LIBRARY_OUTPUT_DIRECTORY ${DPM_TEST_FIXTURE_DIR}
+    )
+endforeach()
+
+# ---------------------------------------------------------------------
+# API test binary — drives libdpm-core.so through its public C API
+# ---------------------------------------------------------------------
+add_executable(test_core test_core.cpp)
+
+target_link_libraries(test_core PRIVATE dpm-core)
+
+target_compile_definitions(test_core PRIVATE
+        TEST_FIXTURE_MODULES="${DPM_TEST_FIXTURE_DIR}"
+        TEST_FIXTURE_CONF="${CMAKE_CURRENT_SOURCE_DIR}/fixtures/conf"
+        DPM_CORE_VERSION_EXPECTED="${PROJECT_VERSION}"
+)
+
+set_target_properties(test_core PROPERTIES
+        RUNTIME_OUTPUT_DIRECTORY ${DPM_TEST_DIR}
+        BUILD_RPATH "$ORIGIN/../lib"
+)
+
+foreach(fixture good missing_symbols bad_version)
+    add_dependencies(test_core fixture_${fixture})
+endforeach()
+
+add_test(NAME core_api COMMAND test_core)
+
+# ---------------------------------------------------------------------
+# CLI end-to-end tests (the dpm binary is the cheapest full-stack client)
+# ---------------------------------------------------------------------
+add_test(NAME cli_help COMMAND dpm --help)
+set_tests_properties(cli_help PROPERTIES PASS_REGULAR_EXPRESSION "Usage: dpm")
+
+add_test(NAME cli_list
+        COMMAND dpm -c ${CMAKE_CURRENT_SOURCE_DIR}/fixtures/conf
+                    -m ${CMAKE_BINARY_DIR}/modules --list-modules)
+set_tests_properties(cli_list PROPERTIES PASS_REGULAR_EXPRESSION "info")
+
+add_test(NAME cli_info_version
+        COMMAND dpm -c ${CMAKE_CURRENT_SOURCE_DIR}/fixtures/conf
+                    -m ${CMAKE_BINARY_DIR}/modules -L INFO info version)
+set_tests_properties(cli_info_version PROPERTIES
+        PASS_REGULAR_EXPRESSION "libdpm-core Version: ${PROJECT_VERSION}")
+
+add_test(NAME cli_module_not_found
+        COMMAND dpm -c ${CMAKE_CURRENT_SOURCE_DIR}/fixtures/conf
+                    -m ${CMAKE_BINARY_DIR}/modules nonexistent)
+set_tests_properties(cli_module_not_found PROPERTIES WILL_FAIL TRUE)
+
+add_test(NAME cli_rejects_invalid_module
+        COMMAND dpm -c ${CMAKE_CURRENT_SOURCE_DIR}/fixtures/conf
+                    -m ${DPM_TEST_FIXTURE_DIR} missing_symbols)
+set_tests_properties(cli_rejects_invalid_module PROPERTIES WILL_FAIL TRUE)