PR: decimal value shall not be greater than 18 (#309)

* PR: decimal value shall not be greater than 18

* test.rs: decimal_is_over_eighteen() test added

* test.rs: cargo fmt changes

token/src/contract.rs

@@ -28,8 +28,8 @@ impl Token {
             panic!("already initialized")
         }
         write_administrator(&e, &admin);
-        if decimal > u8::MAX.into() {
-            panic!("Decimal must fit in a u8");
+        if decimal > 18 {
+            panic!("Decimal must not be greater than 18");
         }
 
         write_metadata(

token/src/test.rs

@@ -242,17 +242,12 @@ fn initialize_already_initialized() {
 }
 
 #[test]
-#[should_panic(expected = "Decimal must fit in a u8")]
-fn decimal_is_over_max() {
+#[should_panic(expected = "Decimal must not be greater than 18")]
+fn decimal_is_over_eighteen() {
     let e = Env::default();
     let admin = Address::generate(&e);
     let token = TokenClient::new(&e, &e.register_contract(None, Token {}));
-    token.initialize(
-        &admin,
-        &(u32::from(u8::MAX) + 1),
-        &"name".into_val(&e),
-        &"symbol".into_val(&e),
-    );
+    token.initialize(&admin, &19, &"name".into_val(&e), &"symbol".into_val(&e));
 }
 
 #[test]