diff --git a/src/__tests__/main.test.ts b/src/__tests__/main.test.ts
index fa94780b..f5e0ac5e 100644
--- a/src/__tests__/main.test.ts
+++ b/src/__tests__/main.test.ts
@@ -1,4 +1,5 @@
-import { getCompilerInfo } from "../main"
+import { syncVersions } from "../default_versions"
+import { getCompilerInfo, Inputs, parseArgs } from "../main"
 
 jest.setTimeout(300000)
 describe("getCompilerInfo", () => {
@@ -20,3 +21,16 @@ describe("getCompilerInfo", () => {
     expect(version).toBe("12")
   })
 })
+
+describe("syncVersion", () => {
+  it("Syncs llvm tools versions", async () => {
+    const llvmTools = ["llvm", "clangtidy", "clangformat"] as Inputs[]
+    expect(syncVersions(parseArgs(["--llvm", "14.0.0", "--clangtidy", "true"]), llvmTools)).toBe(true)
+    expect(syncVersions(parseArgs(["--llvm", "13.0.0", "--clangtidy", "true"]), llvmTools)).toBe(true)
+    expect(syncVersions(parseArgs(["--llvm", "13.0.0", "--clangtidy", "12.0.0"]), llvmTools)).toBe(false)
+
+    const opts = parseArgs(["--llvm", "14.0.0", "--clangtidy", "true"])
+    expect(syncVersions(opts, llvmTools)).toBe(true)
+    expect(opts.llvm).toBe(opts.clangtidy)
+  })
+})