1 files changed, 17 insertions, 0 deletions
diff --git a/test/roots.t.c b/test/roots.t.c
new file mode 100644
index 0000000..632832a
--- /dev/null
+++ b/test/roots.t.c
@@ -0,0 +1,17 @@
+#include "lizfcm.test.h"
+#include <stdio.h>
+
+double g(double x) { return x * x - 9; }
+
+UTEST(ivt, find_interval) {
+  double *range = find_ivt_range(&g, -100.0, 1.0, 200);
+  EXPECT_LT(g(range[0]) * g(range[1]), 0);
+
+  free(range);
+}
+
+UTEST(root, bisection_with_error_assumption) {
+  double root = bisect_find_root_with_error_assumption(&g, -5, 0, 0.01);
+
+  EXPECT_NEAR(-3, root, 0.01);
+}