diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 13ebf3c..da63852 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -7,6 +7,7 @@ include_directories(../include ../src)
 
 set(TEST_SOURCES
     ordered-set.c
+    asprintf.c
     redirect.cc
 )
 
diff --git a/test/asprintf.c b/test/asprintf.c
new file mode 100644
index 0000000..2640337
--- /dev/null
+++ b/test/asprintf.c
@@ -0,0 +1,65 @@
+#include "criterion/criterion.h"
+#include "criterion/theories.h"
+#include "criterion/asprintf-compat.h"
+
+#include <stdio.h>
+
+union anyval {
+    int c;
+    int hd;
+    int d;
+    long ld;
+    long long lld;
+    unsigned int hu;
+    unsigned int u;
+    unsigned long lu;
+    unsigned long long llu;
+    double f;
+    const char *s;
+    void *p;
+};
+
+struct format_test {
+    const char *format;
+    union anyval *val;
+};
+
+# define VALUE(Fmt, Val) &(struct format_test) { .format = "%" #Fmt, .val = &(union anyval) { . Fmt = Val } }
+
+TheoryDataPoints(asprintf, valid) = {
+    DataPoints(struct format_test *,
+            VALUE(c, 'a'),
+            VALUE(hd, 42),
+            VALUE(d, 42),
+            VALUE(ld, 42),
+            VALUE(lld, 42),
+            VALUE(hu, 42),
+            VALUE(u, 42),
+            VALUE(lu, 42),
+            VALUE(llu, 42),
+            VALUE(f, 3.14),
+            VALUE(s, "foo"),
+            VALUE(p, NULL),
+        ),
+};
+
+Theory((struct format_test *fmt), asprintf, valid) {
+    char expected[32];
+    snprintf(expected, sizeof (expected), fmt->format, *fmt->val);
+
+    char *actual;
+    cr_asprintf(&actual, fmt->format, *fmt->val);
+
+    cr_expect_str_eq(actual, expected);
+
+    free(actual);
+}
+
+#ifdef __GNUC__
+# pragma GCC diagnostic ignored "-Wformat"
+#endif
+
+Test(asprintf, invalid) {
+    char *actual;
+    cr_expect_eq(cr_asprintf(&actual, "%"), -1);
+}