2 files changed, 6 insertions, 2 deletions
diff --git a/test/test_reader.c b/test/test_reader.c
index e1ca0934..4db83eee 100644
--- a/test/test_reader.c
+++ b/test/test_reader.c
@@ -217,6 +217,7 @@ test_read_nquads_chunks(const char* const path)
   static const char null = 0;
 
   FILE* const f = fopen(path, "w+b");
+  assert(f);
 
   // Write two statements, a null separator, then another statement
 
@@ -303,6 +304,7 @@ test_read_turtle_chunks(const char* const path)
   static const char null = 0;
 
   FILE* const f = fopen(path, "w+b");
+  assert(f);
 
   // Write two statements separated by null characters
   fprintf(f, "@base <http://example.org/base/> .\n");
diff --git a/test/test_reader_writer.c b/test/test_reader_writer.c
index bebda449..7302fa39 100644
--- a/test/test_reader_writer.c
+++ b/test/test_reader_writer.c
@@ -146,10 +146,12 @@ test_write_errors(void)
 static void
 test_writer(const char* const path)
 {
-  FILE*    fd  = fopen(path, "wb");
-  SerdEnv* env = serd_env_new(NULL);
+  FILE* const fd = fopen(path, "wb");
   assert(fd);
 
+  SerdEnv* const env = serd_env_new(NULL);
+  assert(env);
+
   SerdWriter* writer =
     serd_writer_new(SERD_TURTLE, (SerdStyle)0, env, NULL, serd_file_sink, fd);
   assert(writer);