diff --git a/src/herumi/privateKey.ts b/src/herumi/privateKey.ts
index a1ba0d9..c791d2f 100644
--- a/src/herumi/privateKey.ts
+++ b/src/herumi/privateKey.ts
@@ -31,10 +31,6 @@ export class PrivateKey {
     return this.fromBytes(sk);
   }
 
-  getValue(): SecretKeyType {
-    return this.value;
-  }
-
   signMessage(message: Uint8Array): Signature {
     return new Signature(this.value.sign(message));
   }
diff --git a/test/unit/keypair.test.ts b/test/unit/keypair.test.ts
new file mode 100644
index 0000000..4884217
--- /dev/null
+++ b/test/unit/keypair.test.ts
@@ -0,0 +1,27 @@
+import {expect} from "chai";
+import {forEachImplementation} from "../switch";
+
+forEachImplementation((bls) => {
+  describe("Keypair", () => {
+    it("should create from private and public key", () => {
+      const sk = bls.PrivateKey.fromKeygen();
+      const sk2 = bls.PrivateKey.fromKeygen();
+      const pk = sk.toPublicKey();
+
+      const keypair = new bls.Keypair(sk as any, pk as any);
+
+      expect(keypair.publicKey).to.be.equal(pk);
+      expect(keypair.privateKey).to.be.equal(sk);
+      expect(keypair.privateKey).to.not.be.equal(sk2);
+    });
+
+    it("should create from PrivateKey", () => {
+      const sk = bls.PrivateKey.fromKeygen();
+      const pk = sk.toPublicKey();
+
+      const keypair = new bls.Keypair(sk as any);
+
+      expect(keypair.publicKey.toHex()).to.equal(pk.toHex());
+    });
+  });
+});