Replace cumbersome unit tests by integration tests

tests/eslint.test.config.js

@@ -0,0 +1,33 @@
+const js = require("@eslint/js");
+const stylistic = require("@stylistic/eslint-plugin");
+const globals = require("globals");
+
+const customizedStylistic = stylistic.configs.customize({
+  "indent": 2,
+  "jsx": false,
+  "quote-props": "always",
+  "semi": "always",
+  "brace-style": "1tbs",
+});
+
+module.exports = [
+  js.configs.recommended,
+  {
+    plugins: {
+      "@stylistic": stylistic,
+    },
+    rules: {
+      ...customizedStylistic.rules,
+      "no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
+      "@stylistic/quotes": ["error", "double", { avoidEscape: true }],
+    },
+    languageOptions: {
+      ecmaVersion: 2024,
+      sourceType: "module",
+      globals: {
+        ...globals.node,
+        ...globals.mocha,
+      },
+    },
+  },
+];

tests/fixtures/common.expected.js

@@ -0,0 +1,12 @@
+if (<%= @success %>) {
+  console.log("Success 🎉");
+  $("#yeah").html("<%= j render partial: 'yeah',
+                          locals: { cool: @cool } %>");
+}
+else {
+  console.log("Sad noises");
+}
+
+<% if you_feel_lucky %>
+console.log("You are lucky 🍀");
+<% end %>