[Tests] added float tests

src/test/stdtest/float.rs

+use std;
+import std::float;
+
+#[test]
+fn test_from_str() {
+   assert ( float::from_str("3.14") == 3.14 );
+   assert ( float::from_str("+3.14") == 3.14 );
+   assert ( float::from_str("-3.14") == -3.14 );
+   assert ( float::from_str("2.5E10") == 25000000000. );
+   assert ( float::from_str("2.5e10") == 25000000000. );
+   assert ( float::from_str("25000000000.E-10") == 2.5 );
+   assert ( float::from_str("") == 0. );
+   assert ( float::from_str("   ") == 0. );
+   assert ( float::from_str(".") == 0. );
+   assert ( float::from_str("5.") == 5. );
+   assert ( float::from_str(".5") == 0.5 );
+   assert ( float::from_str("0.5") == 0.5 );
+
+}

src/test/stdtest/stdtest.rc

@@ -29,6 +29,7 @@ mod sys;
 mod task;
 mod test;
 mod uint;
+mod float;
 
 // Local Variables:
 // mode: rust