diff --git a/src/index.ts b/src/index.ts
index d884f1d..72b9188 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -15,7 +15,7 @@ if (registryUrl) {
   registries.push({
     url: registryUrl,
     scope: scope,
-    token: "$$BUN_AUTH_TOKEN",
+    token: "$BUN_AUTH_TOKEN",
   });
 }
 
diff --git a/tests/bunfig.spec.ts b/tests/bunfig.spec.ts
index 3230860..9f52dc7 100644
--- a/tests/bunfig.spec.ts
+++ b/tests/bunfig.spec.ts
@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it } from "bun:test";
-import { unlink } from "fs";
+import { unlinkSync } from "node:fs";
 import { writeBunfig } from "../src/bunfig";
 import { EOL } from "os";
 
@@ -14,7 +14,8 @@ describe("writeBunfig", () => {
   }
 
   afterEach(() => {
-    unlink(filePath, () => console.log(`${filePath} was deleted`));
+    unlinkSync(filePath);
+    console.log(`${filePath} was deleted`);
   });
 
   describe("when no bunfig.toml file exists", () => {
@@ -43,6 +44,32 @@ describe("writeBunfig", () => {
 
       expect(contents.length).toBe(expectedContents.length);
     });
+
+    it("should create a new file with global registry", async () => {
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "",
+          token: "$BUN_AUTH_TOKEN",
+        },
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        'registry = "https://npm.pkg.github.com/"',
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
   });
 
   describe("when local bunfig.toml file exists", () => {
@@ -154,5 +181,48 @@ describe("writeBunfig", () => {
 
       expect(contents.length).toBe(expectedContents.length);
     });
+
+    it("and [install.scopes] and [install] exists, should concantenate file correctly", async () => {
+      const bunfig = `[install]${EOL}optional = true${EOL}${EOL}[install.scopes]${EOL}'@foo-bar' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}'@bla-ble' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }${EOL}${EOL}[install.cache]${EOL}disable = true`;
+
+      await Bun.write(filePath, bunfig);
+
+      writeBunfig(filePath, [
+        {
+          url: "https://npm.pkg.github.com",
+          scope: "foo-bar",
+          token: "$BUN_AUTH_TOKEN",
+        },
+        {
+          url: "https://bun.sh",
+          scope: "",
+          token: "$BUN_AUTH_TOKEN",
+        }, // global registry
+      ]);
+
+      const { file, contents } = await getFileAndContents();
+
+      expect(file.exists()).resolves.toBeTrue();
+
+      const expectedContents = [
+        "[install]",
+        'registry = "https://bun.sh/"',
+        "optional = true",
+        "",
+        "[install.scopes]",
+        '\'@foo-bar\' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }',
+        '\'@bla-ble\' = { token = "$BUN_AUTH_TOKEN", url = "https://npm.pkg.github.com/" }',
+        "",
+        "[install.cache]",
+        "disable = true",
+        "",
+      ];
+
+      contents.forEach((content, index) =>
+        expect(content).toBe(expectedContents[index])
+      );
+
+      expect(contents.length).toBe(expectedContents.length);
+    });
   });
 });