Add test case for rust-lang#170

Signed-off-by: Benjamin Schultzer <benjamin@schultzer.com>

src/math/jn.rs

@@ -341,3 +341,18 @@ pub fn yn(n: i32, x: f64) -> f64 {
         b
     }
 }
+
+#[cfg(test)]
+mod test {
+
+    #[test]
+    pub fn issue_170() {
+        let expected = f64::from_bits(1617394868955);
+        let result = super::jn(114, f64::from_bits(4594974205335009568));
+        assert!(crate::_eq(result, expected).is_ok());
+
+        let expected = f64::from_bits(15924833);
+        let result = super::jn(136, f64::from_bits(4602429132083530282));
+        assert!(crate::_eq(result, expected).is_ok());
+    }
+}

src/math/jnf.rs

@@ -257,3 +257,14 @@ pub fn ynf(n: i32, x: f32) -> f32 {
         b
     }
 }
+
+#[cfg(test)]
+mod test {
+
+    #[test]
+    pub fn issue_170() {
+        let expected = f32::from_bits(86);
+        let result = super::jnf(29, f32::from_bits(1061546867));
+        assert!(crate::_eqf(result, expected).is_ok());
+    }
+}