1 files changed, 3 insertions, 0 deletions
diff --git a/tests/gl_ps.c b/tests/gl_ps.c
index 81579c1d..6ea0e3db 100644
--- a/tests/gl_ps.c
+++ b/tests/gl_ps.c
@@ -78,6 +78,9 @@ void shaders() {
   glLinkProgram(program);
   glGetProgramiv(program, GL_LINK_STATUS, &ok);
   assert(ok);
+  assert(glIsProgram(program));
+  assert(!glIsProgram(0));
+  assert(!glIsProgram(program+1)); // a number that can't be a real shader
 
   glUseProgram(program);