Add let-else tests. (#7857)

Author: liorgold2

corelib/src/test.cairo

@@ -17,6 +17,7 @@ mod hash_test;
 mod integer_test;
 mod iter_test;
 mod keccak_test;
+mod let_else_test;
 mod math_test;
 mod nullable_test;
 mod num_test;

corelib/src/test/let_else_test.cairo

@@ -0,0 +1,45 @@
+#[test]
+fn test_let_else_panic_return() {
+    let Some(x) = @Some(3) else {
+        panic!("Did not match expected variant.")
+    };
+    assert_eq!(*x, 3);
+    let Some(_) = @None::<felt252> else {
+        return;
+    };
+    panic!("Unexpectedly matches variant.");
+}
+
+#[test]
+fn test_let_else_continue() {
+    let v = array![Some(3), None, Some(5), Some(2), None];
+
+    let mut s: felt252 = 0;
+
+    for x in v {
+        let Some(y) = x else {
+            s += 100;
+            continue;
+        };
+        s += y;
+    }
+
+    assert_eq!(s, 210);
+}
+
+#[test]
+fn test_let_else_break() {
+    let v = array![Some(6), Some(3), None, Some(5)];
+
+    let mut s: felt252 = 0;
+
+    for x in v {
+        let Some(y) = x else {
+            s += 100;
+            break;
+        };
+        s += y;
+    }
+
+    assert_eq!(s, 109);
+}