feat: added enum variant assert macro

src/tests/mod.rs

@@ -1,2 +1,24 @@
 mod conformance;
 mod resistance;
+
+#[macro_export]
+/// Useful for asserting an enum value matches a specific variant
+///
+/// Usage:
+///     `assert_variant!(value, MyEnum::Variant(..));`
+macro_rules! assert_variant {
+    ($value:expr, $pattern:pat) => {{
+        let value = &$value;
+
+        if let $pattern = value {
+        } else {
+            panic!(
+                r#"assertion failed (value doesn't match pattern):
+   value: `{:?}`,
+ pattern: `{}`"#,
+                value,
+                stringify!($pattern)
+            )
+        }
+    }}; // TODO: Additional patterns for trailing args, like assert and assert_eq
+}