Added failing tests for issue #108

Author: lpbak

tests/print_dec.rs

@@ -7,3 +7,15 @@ fn issue_107() {
     let n = Number::from_parts(true, 1, -32768);
     assert_eq!(format!("{}", n), "1e-32768");
 }
+
+#[test]
+fn issue_108_exponent_positive() {
+    let n = Number::from_parts(true, 10_000_000_000_000_000_001, -18);
+    assert_eq!(format!("{}", n), "1.0000000000000000001e+1");
+}
+
+#[test]
+fn issue_108_exponent_0() {
+    let n = Number::from_parts(true, 10_000_000_000_000_000_001, -19);
+    assert_eq!(format!("{}", n), "1.0000000000000000001");
+}