fix: Add tests for signature info

modules/serialize/test/fixtures.ts

@@ -68,3 +68,11 @@ export function headerAuthIV () {
 export function encryptedDataKey () {
   return new Uint8Array([ 0, 2, 0, 12, 194, 189, 32, 43, 32, 194, 188, 32, 61, 32, 194, 190, 0, 8, 102, 105, 114, 115, 116, 75, 101, 121, 0, 5, 1, 2, 3, 4, 5, 0, 12, 194, 189, 32, 43, 32, 194, 188, 32, 61, 32, 194, 190, 0, 9, 115, 101, 99, 111, 110, 100, 75, 101, 121, 0, 5, 6, 7, 8, 9, 0 ])
 }
+
+export function ecdsaP256Signature () {
+  return new Uint8Array([48, 68, 2, 32, 22, 77, 187, 192, 175, 104, 2, 240, 55, 2, 6, 138, 103, 148, 214, 240, 244, 65, 224, 254, 60, 52, 218, 22, 250, 245, 216, 228, 151, 151, 220, 234, 2, 32, 125, 9, 97, 8, 132, 123, 79, 193, 216, 207, 214, 0, 73, 183, 149, 173, 26, 173, 251, 132, 140, 139, 44, 122, 11, 50, 163, 105, 138, 221, 223, 29])
+}
+
+export function ecdsaP256SignatureInfo () {
+  return new Uint8Array([0, 70, 48, 68, 2, 32, 22, 77, 187, 192, 175, 104, 2, 240, 55, 2, 6, 138, 103, 148, 214, 240, 244, 65, 224, 254, 60, 52, 218, 22, 250, 245, 216, 228, 151, 151, 220, 234, 2, 32, 125, 9, 97, 8, 132, 123, 79, 193, 216, 207, 214, 0, 73, 183, 149, 173, 26, 173, 251, 132, 140, 139, 44, 122, 11, 50, 163, 105, 138, 221, 223, 29])
+}

modules/serialize/test/signature_info.test.ts

@@ -0,0 +1,51 @@
+/*
+ * 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 { serializeSignatureInfo, deserializeSignature } from '../src/signature_info'
+import * as fixtures from './fixtures'
+
+describe('serializeSignatureInfo', () => {
+  it('returns signature info', () => {
+    const test = serializeSignatureInfo(fixtures.ecdsaP256Signature())
+    expect(test).to.deep.equal(fixtures.ecdsaP256SignatureInfo())
+  })
+})
+
+describe('deserializeSignature', () => {
+  it('returns the signature', () => {
+    const test = deserializeSignature(fixtures.ecdsaP256SignatureInfo())
+    expect(test).to.deep.equal(fixtures.ecdsaP256Signature())
+  })
+
+  it('Precondition: There must be information for a signature.', () => {
+    expect(() => deserializeSignature({} as any)).to.throw()
+  })
+
+  it('Precondition: The signature length must be positive.', () => {
+    const badInfo = fixtures.ecdsaP256SignatureInfo()
+    badInfo[1] = 0
+    expect(() => deserializeSignature(badInfo)).to.throw()
+  })
+
+  it('Precondition: The data must match the serialized length.', () => {
+    const badInfo = fixtures.ecdsaP256SignatureInfo()
+    badInfo[1] = badInfo[1] + 1
+    expect(() => deserializeSignature(badInfo)).to.throw()
+  })
+})