added gen test

compiler/test_gen/src/gen_result.rs

@@ -159,3 +159,33 @@ fn err_empty_tag_union() {
         i64
     );
 }
+
+#[test]
+#[cfg(any(feature = "gen-llvm"))]
+fn is_ok() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            result : Result I64 {}
+            result = Ok 2
+
+            Result.isOk result
+            "#
+        ),
+        true,
+        bool
+    );
+
+    assert_evals_to!(
+        indoc!(
+            r#"
+            result : Result I64 {}
+            result = Err {}
+
+            Result.isOk result
+            "#
+        ),
+        false,
+        bool
+    );
+}

compiler/test_gen/src/tests.rs

@@ -12,6 +12,7 @@ pub mod gen_primitives;
 pub mod gen_records;
 pub mod gen_set;
 pub mod gen_str;
+pub mod gen_result;
 pub mod gen_tags;
 mod helpers;
 pub mod wasm_str;