diff --git a/test/EcdsaMultikey.spec.js b/test/EcdsaMultikey.spec.js
index cec5325..9cd13ae 100644
--- a/test/EcdsaMultikey.spec.js
+++ b/test/EcdsaMultikey.spec.js
@@ -4,9 +4,7 @@
 import * as base58 from 'base58-universal';
 import * as EcdsaMultikey from '../lib/index.js';
 import chai from 'chai';
-import {getNamedCurveFromPublicMultikey} from '../lib/helpers.js';
 import {
-  mockKey,
   mockKeyEcdsaSecp256,
   mockKeyEcdsaSecp384,
   mockKeyEcdsaSecp521,
@@ -53,16 +51,6 @@ describe('EcdsaMultikey', () => {
   });
 
   describe('from', () => {
-    it('should auto-set key.id based on controller', async () => {
-      const {publicKeyMultibase} = mockKey;
-
-      const keyPair = await EcdsaMultikey.from(mockKey);
-
-      _ensurePublicKeyEncoding({keyPair, publicKeyMultibase});
-      expect(keyPair.id).to.equal(
-        'did:example:1234#zDnaeSMnptAKpH4AD41vTkwzjznW7yNetdRh9FJn8bJsbsdbw'
-      );
-    });
 
     it('should error if publicKeyMultibase property is missing', async () => {
       let error;
@@ -257,15 +245,3 @@ describe('EcdsaMultikey', () => {
     });
   });
 });
-
-function _ensurePublicKeyEncoding({keyPair, publicKeyMultibase}) {
-  keyPair.publicKeyMultibase.startsWith('z').should.be.true;
-  publicKeyMultibase.startsWith('z').should.be.true;
-  const decodedPubkey = base58.decode(publicKeyMultibase.slice(1));
-  const ecdsaCurve = getNamedCurveFromPublicMultikey({
-    publicMultikey: decodedPubkey
-  });
-  ecdsaCurve.should.equal('P-256');
-  const encodedPubkey = 'z' + base58.encode(decodedPubkey);
-  encodedPubkey.should.equal(keyPair.publicKeyMultibase);
-}
diff --git a/test/assertions.js b/test/assertions.js
index eec3b7d..1dd575f 100644
--- a/test/assertions.js
+++ b/test/assertions.js
@@ -8,6 +8,7 @@ import {stringToUint8Array} from './text-encoder.js';
 import {CryptoKey} from '../lib/crypto.js';
 import {webcrypto} from '../lib/crypto.js';
 import {exportKeyPair} from '../lib/serialize.js';
+import {getNamedCurveFromPublicMultikey} from '../lib/helpers.js';
 
 chai.should();
 const {expect} = chai;
@@ -168,3 +169,24 @@ export function testExport({curve}) {
     expect(expectedSecretKey).to.deep.equal(secretKey);
   });
 }
+
+export function testFrom({serializedKeyPair, id, keyType}) {
+  it('should auto-set key.id based on controller', async () => {
+    const {publicKeyMultibase} = serializedKeyPair;
+    const keyPair = await EcdsaMultikey.from(serializedKeyPair);
+    _ensurePublicKeyEncoding({keyPair, keyType, publicKeyMultibase});
+    expect(keyPair.id).to.equal(id);
+  });
+}
+
+function _ensurePublicKeyEncoding({keyPair, publicKeyMultibase, keyType}) {
+  keyPair.publicKeyMultibase.startsWith('z').should.be.true;
+  publicKeyMultibase.startsWith('z').should.be.true;
+  const decodedPubkey = base58.decode(publicKeyMultibase.slice(1));
+  const ecdsaCurve = getNamedCurveFromPublicMultikey({
+    publicMultikey: decodedPubkey
+  });
+  ecdsaCurve.should.equal(keyType);
+  const encodedPubkey = 'z' + base58.encode(decodedPubkey);
+  encodedPubkey.should.equal(keyPair.publicKeyMultibase);
+}
diff --git a/test/multikey.spec.js b/test/multikey.spec.js
index 6b9ceee..88e7d46 100644
--- a/test/multikey.spec.js
+++ b/test/multikey.spec.js
@@ -6,6 +6,7 @@ import {multikeys} from './mock-data.js';
 import {
   testAlgorithm,
   testExport,
+  testFrom,
   testGenerate,
   testSignVerify
 } from './assertions.js';
@@ -30,6 +31,9 @@ describe('ecdsa-multikey', function() {
       describe('sign and verify', function() {
         testSignVerify({id, serializedKeyPair, keyType});
       });
+      describe('from', function() {
+        testFrom({keyType, id, serializedKeyPair});
+      });
     });
   }
 });