isl_test: check srcdir has been set

diff --git a/isl_test.c b/isl_test.c
index 1c108cb..a12c24e 100644 (file)
--- a/isl_test.c
+++ b/isl_test.c
@@ -582,6 +582,7 @@ int main()
        struct isl_ctx *ctx;
 
        srcdir = getenv("srcdir");
+       assert(srcdir);
 
        ctx = isl_ctx_alloc();
        test_read(ctx);