added to_float exception test

Author: David Schaefer

tests/pixie/tests/test-ffi.pxi

@@ -48,6 +48,14 @@
   (t/assert= 0.5 (asinf (sinf 0.5)))
   (t/assert= 1.0 (+ (powf (sinf 0.5) 2.0) (powf (cosf 0.5) 2.0))))
 
+(t/deftest test-invalid-float-argument
+  (try
+    (m/sin "nil")
+    (catch ex (t/assert= (type ex) RuntimeException)))
+  (try
+    (m/exp nil)
+    (catch ex (t/assert= (type ex) RuntimeException)))
+  )
 
 (t/deftest test-ffi-callbacks
   (let [MAX 255