diff --git a/setup.py b/setup.py
index 4e4b7de..ed95bef 100644
--- a/setup.py
+++ b/setup.py
@@ -18,8 +18,8 @@ my_extension = setuptools.Extension(
     "pywikidiff2",
     sources=cpp_sources,
     include_dirs=[],
-    extra_compile_args=["-Wall", "-std=c++17", "-fPIC","-lthai","-lstdc++"],
-    extra_link_args=["-lthai", "-lstdc++"],
+    extra_compile_args=["-Wall", "-std=c++17", "-fPIC","-lthai","-lstdc++","-O0"],
+    extra_link_args=["-lthai", "-lstdc++","-fPIC","-g","-O0"],
     language="c++",
 )
 
diff --git a/test/test_pywikidiff2.py b/test/test_pywikidiff2.py
index 134f853..50116bf 100644
--- a/test/test_pywikidiff2.py
+++ b/test/test_pywikidiff2.py
@@ -14,6 +14,15 @@ print(obj.final_split_threshold())
 
 res = obj.inline_json_diff("help! \n I'm alive", "help! \n dead I am")
 print(res)
+print(obj.num_context_lines())
+res = obj.inline_json_diff(open("test/err_last_text",'r').read(),
+                           open("test/err_text",'r').read(),
+                           numContextLines=10000)
+
+res = obj.inline_json_diff("",
+                           open("test/1295229484",'r').read(),
+                           numContextLines=1000)
+
 res = obj.inline_json_diff(open("test/1285792388",'r').read(),
                            open("test/1295229484",'r').read(),
                            numContextLines=1000)