fix: fixed tests

fix #3

Author: Shestakov Aleksandr

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "editor.formatOnSave": true,
+  "editor.renderWhitespace": "all",
+  "editor.rulers": [80, 100]
+}

package-lock.json

@@ -1,6 +1,6 @@
 import vm from "vm";
 import fs from "fs";
-import { dirname, resolve, relative, sep as pathSeperator } from "path";
+import path from "path";
 
 function wrapModuleExports(code) {
   return `
@@ -39,8 +39,12 @@ export default function ssr(options = {}) {
   return {
     name: "svelte-ssr",
     async generateBundle(config, bundle, isWrite) {
-      const destPath = relative("./", config.file);
-      const destDir = destPath.slice(0, destPath.indexOf(pathSeperator));
+      if (config.format !== "cjs") {
+        throw new Error("rollup-plugin-svelte-ssr can only be used with 'cjs'-format");
+      }
+
+      const destPath = path.relative("./", config.file);
+      const destDir = destPath.slice(0, destPath.indexOf(path.sep));
 
       Object.keys(bundle).forEach(async key => {
         const entry = bundle[key];
@@ -82,8 +86,8 @@ export default function ssr(options = {}) {
             ? pluginOptions.fileName(entry)
             : pluginOptions.fileName;
 
-        const destination = resolve(destDir, fileName);
-        fs.mkdirSync(dirname(destination), { recursive: true });
+        const destination = path.resolve(destDir, fileName);
+        fs.mkdirSync(path.dirname(destination), { recursive: true });
         fs.writeFileSync(destination, pluginOptions.configureExport(html, css));
 
         if (pluginOptions.skipEmit) {

src/index.js

@@ -192,19 +192,15 @@ describe("plugin tests", () => {
       skipEmit: true,
     };
 
-    let error;
-    try {
-      await bundleWithRollup({
+    await expect(
+      bundleWithRollup({
         format: "esm",
         plugin,
         pluginOptions,
         testName: "it-throws-error-for-non-cjs-format",
         output: "doesnt-matter.html",
-      });
-    } catch (e) {
-      error = e;
-    }
-    expect(error).toEqual(new Error("rollup-plugin-svelte-ssr can only be used with 'cjs'-format"));
+      }),
+    ).rejects.toThrow(new Error("rollup-plugin-svelte-ssr can only be used with 'cjs'-format"));
   });
 
   it("should throw error if no filename option has been passed", async () => {
@@ -215,7 +211,6 @@ describe("plugin tests", () => {
     let error;
     try {
       await bundleWithRollup({
-        format: "esm",
         plugin,
         pluginOptions,
         testName: "it-throws-error-if-no-filename-passed",