diff --git a/modules/caching-materials-manager-node/src/caching_materials_manager_node.ts b/modules/caching-materials-manager-node/src/caching_materials_manager_node.ts
index 64fbbc49a..fb52ff7d9 100644
--- a/modules/caching-materials-manager-node/src/caching_materials_manager_node.ts
+++ b/modules/caching-materials-manager-node/src/caching_materials_manager_node.ts
@@ -31,15 +31,11 @@ import {
   NodeGetEncryptionMaterials, // eslint-disable-line no-unused-vars
   NodeGetDecryptMaterials // eslint-disable-line no-unused-vars
 } from '@aws-crypto/material-management-node'
-
-import { createHash, randomBytes } from 'crypto'
+import { sha512 } from './sha512'
+import { randomBytes } from 'crypto'
 
 const fromUtf8 = (input: string) => Buffer.from(input, 'utf8')
 const toUtf8 = (input: Uint8Array) => Buffer.from(input).toString('utf8')
-const sha512 = async (...data: (Uint8Array|string)[]) => data
-  .map(item => typeof item === 'string' ? Buffer.from(item, 'hex') : item)
-  .reduce((hash, item) => hash.update(item), createHash('sha512'))
-  .digest()
 
 const cacheKeyHelpers = buildCryptographicMaterialsCacheKeyHelpers(fromUtf8, toUtf8, sha512)
 
diff --git a/modules/caching-materials-manager-node/src/sha512.ts b/modules/caching-materials-manager-node/src/sha512.ts
new file mode 100644
index 000000000..59be44917
--- /dev/null
+++ b/modules/caching-materials-manager-node/src/sha512.ts
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. A copy of the License is
+ * located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { createHash } from 'crypto'
+
+export const sha512 = async (...data: (Uint8Array|string)[]) => data
+  .map(item => typeof item === 'string' ? Buffer.from(item) : item)
+  .reduce((hash, item) => hash.update(item), createHash('sha512'))
+  .digest()
diff --git a/modules/caching-materials-manager-node/test/caching_materials_manager_node.test.ts b/modules/caching-materials-manager-node/test/caching_materials_manager_node.test.ts
new file mode 100644
index 000000000..61857ee6a
--- /dev/null
+++ b/modules/caching-materials-manager-node/test/caching_materials_manager_node.test.ts
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. A copy of the License is
+ * located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* eslint-env mocha */
+
+import { expect } from 'chai'
+import 'mocha'
+import { NodeCachingMaterialsManager } from '../src/index'
+import { } from '@aws-crypto/cache-material'
+import {
+  KeyringNode,
+  NodeDefaultCryptographicMaterialsManager,
+  NodeEncryptionMaterial, // eslint-disable-line no-unused-vars
+  NodeDecryptionMaterial // eslint-disable-line no-unused-vars
+} from '@aws-crypto/material-management-node'
+
+describe('NodeCachingMaterialsManager', () => {
+  it('constructor will decorate', () => {
+    class TestKeyring extends KeyringNode {
+      async _onEncrypt (): Promise<NodeEncryptionMaterial> {
+        throw new Error('never')
+      }
+      async _onDecrypt (): Promise<NodeDecryptionMaterial> {
+        throw new Error('never')
+      }
+    }
+
+    const keyring = new TestKeyring()
+    const cache = 'cache' as any
+    const partition = 'partition'
+    const maxAge = 10
+    const maxBytesEncrypted = 11
+    const maxMessagesEncrypted = 12
+    const test = new NodeCachingMaterialsManager({
+      backingMaterials: keyring,
+      cache,
+      partition,
+      maxAge,
+      maxBytesEncrypted,
+      maxMessagesEncrypted
+    })
+
+    expect(test._backingMaterialsManager).to.be.instanceOf(NodeDefaultCryptographicMaterialsManager)
+    expect(test._cache).to.equal(cache)
+    expect(test._partition).to.equal(partition)
+    expect(test._maxAge).to.equal(maxAge)
+    expect(test._maxBytesEncrypted).to.equal(maxBytesEncrypted)
+    expect(test._maxMessagesEncrypted).to.equal(maxMessagesEncrypted)
+  })
+})
diff --git a/modules/caching-materials-manager-node/test/sha512.test.ts b/modules/caching-materials-manager-node/test/sha512.test.ts
new file mode 100644
index 000000000..5e6984533
--- /dev/null
+++ b/modules/caching-materials-manager-node/test/sha512.test.ts
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. A copy of the License is
+ * located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied. See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* eslint-env mocha */
+
+import { expect } from 'chai'
+import 'mocha'
+import { sha512 } from '../src/sha512'
+
+// sha512('asdf')
+const fixture = Buffer.from('QBsJ6rPAE9TKVJIruAK+yP1TGBkrCnXyAdizcnQpCA+zN1kavT5ERTuVRVW3oIEuEIHDm3QCk/dl6ucx9aZe0Q==', 'base64')
+
+describe('WebCryptoCachingMaterialsManager', () => {
+  it('can hash a string', async () => {
+    const test = await sha512('asdf')
+    expect(test).to.deep.equal(fixture)
+  })
+
+  it('can hash a Uint8Array', async () => {
+    // the string 'asdf' as utf-8 encoded bytes
+    const test = await sha512(Buffer.from([ 97, 115, 100, 102 ]))
+    expect(test).to.deep.equal(fixture)
+  })
+
+  it('can hash a mix of arguments', async () => {
+    // the string 'asdf' as a mix of strings and binary
+    const test = await sha512('a', new Uint8Array([115]), 'd', Buffer.from([102]))
+    expect(test).to.deep.equal(fixture)
+  })
+})