test: update tests for flt2dec fallouts.

Author: lifthrasiir

src/libserialize/json.rs

@@ -3011,9 +3011,9 @@ mod tests {
         let v: i64 = super::decode("9223372036854775807").unwrap();
         assert_eq!(v, i64::MAX);
 
-        let res: DecodeResult<i64> = super::decode("765.25252");
+        let res: DecodeResult<i64> = super::decode("765.25");
         assert_eq!(res, Err(ExpectedError("Integer".to_string(),
-                                          "765.25252".to_string())));
+                                          "765.25".to_string())));
     }
 
     #[test]

src/test/run-pass/ifmt.rs

@@ -138,10 +138,10 @@ pub fn main() {
     t!(format!("{:e}", 1.2345e6f32), "1.2345e6");
     t!(format!("{:e}", 1.2345e6f64), "1.2345e6");
     t!(format!("{:E}", 1.2345e6f64), "1.2345E6");
-    t!(format!("{:.3e}", 1.2345e6f64), "1.234e6");
-    t!(format!("{:10.3e}", 1.2345e6f64),   "   1.234e6");
-    t!(format!("{:+10.3e}", 1.2345e6f64),  "  +1.234e6");
-    t!(format!("{:+10.3e}", -1.2345e6f64), "  -1.234e6");
+    t!(format!("{:.3e}", 1.2345e6f64), "1.235e6");
+    t!(format!("{:10.3e}", 1.2345e6f64),   "   1.235e6");
+    t!(format!("{:+10.3e}", 1.2345e6f64),  "  +1.235e6");
+    t!(format!("{:+10.3e}", -1.2345e6f64), "  -1.235e6");
 
     // Float edge cases
     t!(format!("{}", -0.0), "0");