Add testcase

Author: ota-meshi

tests/fixtures/parser/ast/unknown-directive01-input.svelte

@@ -0,0 +1,6 @@
+<script>
+	let foo = false;
+	let bar = false;
+</script>
+<div foo:bar={bar}></div>
+<div bar:foo></div>

tests/fixtures/parser/ast/unknown-directive01-no-unused-vars-result.json

@@ -0,0 +1,8 @@
+[
+  {
+    "ruleId": "no-unused-vars",
+    "code": "foo",
+    "line": 2,
+    "column": 6
+  }
+]