1 files changed, 43 insertions, 0 deletions
diff --git a/src/libnr/nr-rotate-fns-test.cpp b/src/libnr/nr-rotate-fns-test.cpp
new file mode 100644
index 000000000..45b2450e0
--- /dev/null
+++ b/src/libnr/nr-rotate-fns-test.cpp
@@ -0,0 +1,43 @@
+#include <cmath>
+#include <glib/gmacros.h>
+
+#include <libnr/nr-rotate-fns.h>
+#include <utest/utest.h>
+
+int main(int argc, char *argv[])
+{
+    utest_start("rotate-fns");
+
+    UTEST_TEST("rotate_degrees") {
+        double const d[] = {
+            0, 90, 180, 270, 360, 45, 45.01, 44.99, 134, 135, 136, 314, 315, 317, 359, 361
+        };
+        for (unsigned i = 0; i < G_N_ELEMENTS(d); ++i) {
+            double const degrees = d[i];
+            NR::rotate const rot(rotate_degrees(degrees));
+            NR::rotate const rot_approx( M_PI * ( degrees / 180. ) );
+            UTEST_ASSERT(rotate_equalp(rot, rot_approx, 1e-12));
+
+            NR::rotate const rot_inv(rotate_degrees(-degrees));
+            NR::rotate const rot_compl(rotate_degrees(360 - degrees));
+            UTEST_ASSERT(rotate_equalp(rot_inv, rot_compl, 1e-12));
+
+            UTEST_ASSERT(!rotate_equalp(rot, rotate_degrees(degrees + 1), 1e-5));
+        }
+    }
+
+    return ( utest_end()
+             ? EXIT_SUCCESS
+             : EXIT_FAILURE );
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :