Camelcase failing test case

tests/lib/rules/camelcase.js

@@ -0,0 +1,45 @@
+/**
+ * @fileoverview Tests for camelcase rule
+ * @author Guy Lilian & Shahar Or
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const ruleCamelcase = require("eslint/lib/rules/camelcase");
+const RuleTester = require("eslint").RuleTester;
+
+const parser = "typescript-eslint-parser";
+
+const ruleTester = new RuleTester();
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+ruleTester.run("camelcase", ruleCamelcase, {
+    valid: [
+        {
+            code: "interface Foo { b_ar: null }",
+            parser,
+            options: [{ properties: "never" }]
+        }
+    ],
+
+    invalid: [
+        {
+            code: "interface Foo { b_ar: null }",
+            parser,
+            options: [{ properties: "always" }],
+            errors: [
+                {
+                    message: "Identifier 'b_ar' is not in camel case.",
+                    line: 1,
+                    column: 17
+                }
+            ]
+        }
+    ]
+});