diff --git a/test/c/ffi_test.c b/test/c/ffi_test.c
index aca0368..c8e3784 100644
--- a/test/c/ffi_test.c
+++ b/test/c/ffi_test.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 
 const int c = 42;
+const char *s = "Test string";
 
 int add_numbers(int a, int b) {
     return a + b;
@@ -33,6 +34,7 @@ int upcall_test2(int (*f)(void)) {
     return f();
 }
 
+char *mut_str = NULL;
 int counter = 0;
 
 static char* responses[] = { "Hello, world!", "Goodbye friend.", "co'oi prenu" };
diff --git a/test/clj/coffi/ffi_test.clj b/test/clj/coffi/ffi_test.clj
index adda64c..45cc154 100644
--- a/test/clj/coffi/ffi_test.clj
+++ b/test/clj/coffi/ffi_test.clj
@@ -11,7 +11,8 @@
   (t/is (not (nil? (ffi/find-symbol "add_numbers")))))
 
 (t/deftest can-fetch-constant
-  (t/is (= 42 (ffi/const "c" ::mem/int))))
+  (t/is (= 42 (ffi/const "c" ::mem/int)))
+  (t/is (= "Test string" (ffi/const "s" ::mem/c-string))))
 
 (t/deftest can-call-primitive-fns
   (t/is (= 5 ((ffi/cfn "add_numbers" [::mem/int ::mem/int] ::mem/int) 2 3))))
@@ -59,6 +60,11 @@
             :y 42.0})))
 
 (t/deftest static-variables-are-mutable
+  (let [mut-str (ffi/static-variable "mut_str" ::mem/c-string)]
+    (ffi/freset! mut-str nil)
+    (t/is (nil? @mut-str))
+    (ffi/freset! mut-str "Hello world!")
+    (t/is (= "Hello world!" @mut-str)))
   (ffi/freset! (ffi/static-variable "counter" ::mem/int) 1)
   (t/is (= ((ffi/cfn "get_string1" [] ::mem/c-string))
            "Goodbye friend.")))