updated snapshot tests

Author: fpham0701

tests/snapshots/protocols__diagnostic__tests__emit_diagnostic.snap

@@ -0,0 +1,15 @@
+---
+source: src/diagnostic.rs
+expression: content
+---
+warning: Random Warning
+  ┌─ main.calyx:2:1
+  │
+2 │ assert_eq!(x, 20);
+  │ ^^ Random Warning
+
+error: Random Error
+  ┌─ main.calyx:2:4
+  │
+2 │ assert_eq!(x, 20);
+  │    ^^^ Random Error

tests/snapshots/protocols__typecheck__tests__add_transaction.snap

@@ -19,3 +19,9 @@ error: Cannot assign to function argument. Try using assert_eq if you want to ch
    │
 15 │   s := DUT.s;
    │   ^^^^^^^^^^^ Cannot assign to function argument. Try using assert_eq if you want to check the value of a transaction output.
+
+error: DUT.s is an output and thus cannot be assigned.
+   ┌─ add.prot:16:3
+   │
+16 │   DUT.s := a;
+   │   ^^^^^^^^^^^ DUT.s is an output and thus cannot be assigned.