1 files changed, 28 insertions, 0 deletions
diff --git a/test/math/signgam.c b/test/math/signgam.c
new file mode 100644
index 0000000..2f1adba
--- /dev/null
+++ b/test/math/signgam.c
@@ -0,0 +1,28 @@
+#define _XOPEN_SOURCE 600
+#include <math.h>
+#include <float.h>
+#include <stdio.h>
+
+double zero = 0.0;
+double mzero;
+
+int main(void)
+{
+	double d;
+	int errors = 0;
+
+	mzero = copysign(zero, -1.0);
+
+	d = lgamma(zero);
+	printf("%g %d\n", d, signgam);
+	errors += !(d == HUGE_VAL);
+	errors += !(signgam == 1);
+
+	d = lgamma(mzero);
+	printf("%g %d\n", d, signgam);
+	errors += !(d == HUGE_VAL);
+	errors += !(signgam == -1);
+
+	printf("Errors: %d\n", errors);
+	return errors;
+}