diff --git a/src/__tests__/index.test.ts b/src/__tests__/index.test.ts
index 1f355d6..6a6277c 100644
--- a/src/__tests__/index.test.ts
+++ b/src/__tests__/index.test.ts
@@ -11,10 +11,11 @@ describe("Docker names", () => {
 
   test("should generate a random name with a number", () => {
     const nameWithNumber = generateNameWithNumber();
-    const parts = nameWithNumber.split("-");
-    expect(parts).toHaveLength(3);
-    expect(left).toContain(parts[0]);
-    expect(right).toContain(parts[1]);
-    expect(parseInt(parts[2])).toBeGreaterThan(0);
+    const parts = nameWithNumber.split("_");
+    expect(parts).toHaveLength(2);
+    const nameparts = parts[0].split("-");
+    expect(left).toContain(nameparts[0]);
+    expect(right).toContain(nameparts[1]);
+    expect(parseInt(parts[1])).toBeGreaterThan(0);
   });
 });