test: fix

test/fixtures/modules/icss-false-alias/relative.icss.css

@@ -1,4 +1,4 @@
-:import("/unknown.css") {
+:import("./unknown.css") {
   IMPORTED_NAME: primary-color;
 }
 

test/fixtures/modules/icss-false-alias/unknown.css

@@ -0,0 +1,3 @@
+:export {
+    primary-color: red;
+}

test/modules-option.test.js

@@ -854,9 +854,9 @@ describe('"modules" option', () => {
       {
         resolve: {
           alias: {
-            "/unknown.css": isWebpack5
+            "./unknown.css": isWebpack5
               ? false
-              : path.resolve(__dirname, "./fixtures/url/logo.png"),
+              : path.resolve(__dirname, "./fixtures/modules/unknown.css"),
           },
         },
       }