lowercase source files

test/CMakeLists.txt

@@ -2,13 +2,13 @@ enable_testing()
 find_package(GTest REQUIRED)
 
 add_executable(dtl_test 
-  test/Intdifftest.cpp
-  test/Objdifftest.cpp
-  test/Patchtest.cpp
-  test/Strdiff3test.cpp
-  test/Strdifftest.cpp
   test/dtl_test.cpp
   test/dtl_test_common.cpp
+  test/intdifftest.cpp
+  test/objdifftest.cpp
+  test/patchtest.cpp
+  test/strdiff3test.cpp
+  test/strdifftest.cpp
 )
 
 target_include_directories(dtl_test BEFORE PRIVATE