diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e9b2b70..6db142f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -35,18 +35,9 @@ function(regression_test testname)
         add_executable(${testname} ${source} test_renderer.c)
     endif()
 
-    add_test(${testname} ${testname})
+    add_test(${testname} ${testname} ${CMAKE_CURRENT_SOURCE_DIR}/expected_output/${testname}.raw)
     target_link_libraries(${testname} ${HEADERLIB})
 
-    set (rawinput ${CMAKE_CURRENT_SOURCE_DIR}/expected_output/${testname}.raw)
-    set (rawoutput ${CMAKE_CURRENT_BINARY_DIR}/expected_output/${testname}.raw)
-
-    add_custom_target(${testname}_rawcopy
-        COMMAND ${CMAKE_COMMAND} -E copy_if_different ${rawinput} ${rawoutput}
-    )
-
-    add_dependencies(${testname} ${testname}_rawcopy)
-
     target_include_directories(${testname} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
     target_compile_definitions(${testname} PUBLIC TEST_NAME="${testname}")
 
diff --git a/tests/test_renderer.c b/tests/test_renderer.c
index 89380b1..997cc5b 100644
--- a/tests/test_renderer.c
+++ b/tests/test_renderer.c
@@ -28,6 +28,10 @@ int main(int argc, char* argv[]) {
     float max_diff;
     float diff;
 
+    if (argc < 2) {
+        fprintf(stderr, "usage: [test] path/to/expected_wave.raw");
+    }
+
     #ifdef SU_LOAD_GMDLS
     su_load_gmdls();
     #endif
@@ -45,9 +49,7 @@ int main(int argc, char* argv[]) {
     fwrite((void*)buf, sizeof(SUsample), SU_BUFFER_LENGTH, f);
     fclose(f);
 
-    snprintf(filename, sizeof filename, "%s%s%s", expected_output_folder, test_name, ".raw");
-
-    f = fopen(filename, "rb");
+    f = fopen(argv[1], "rb");
 
     if (f == NULL) {
         printf("No expected waveform found!\n");