feat: completed SSMProvider implementation

Author: dreamorosi

Diff for: packages/parameters/src/SSMProvider.ts

@@ -56,7 +56,7 @@ class SSMProvider extends BaseProvider {
    * @param {Record<string, unknown>[]} parameters - List of parameter names, and any optional overrides
    * 
    */
-  public async getParametersByName(parameters: Record<string, SSMGetParametersByNameOptionsInterface>, options: SSMGetParametersByNameOptionsInterface): Promise<Record<string, unknown>> {
+  public async getParametersByName(parameters: Record<string, SSMGetParametersByNameOptionsInterface>, options?: SSMGetParametersByNameOptionsInterface): Promise<Record<string, unknown>> {
     const configs = { ...{
       decrypt: false,
       maxAge: DEFAULT_MAX_AGE_SECS,
@@ -372,8 +372,17 @@ const getParameters = (path: string, options?: SSMGetMultipleOptionsInterface):
   return DEFAULT_PROVIDERS.ssm.getMultiple(path, options);
 };
 
+const getParametersByName = (parameters: Record<string, SSMGetParametersByNameOptionsInterface>, options?: SSMGetParametersByNameOptionsInterface): Promise<Record<string, unknown>> => {
+  if (!DEFAULT_PROVIDERS.hasOwnProperty('ssm')) {
+    DEFAULT_PROVIDERS.ssm = new SSMProvider();
+  }
+
+  return (DEFAULT_PROVIDERS.ssm as SSMProvider).getParametersByName(parameters, options);
+};
+
 export {
   SSMProvider,
   getParameter,
   getParameters,
+  getParametersByName,
 };

Diff for: packages/parameters/tests/unit/getParametersByName.test.ts

@@ -0,0 +1,60 @@
+/**
+  * Test getParametersByName function
+ *
+ * @group unit/parameters/SSMProvider/getParametersByName/function
+ */
+import { DEFAULT_PROVIDERS } from '../../src/BaseProvider';
+import { SSMProvider, getParametersByName } from '../../src/SSMProvider';
+
+describe('Function: getParametersByName', () => {
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  test('when called and a default provider doesn\'t exist, it instantiates one and returns the value', async () => {
+
+    // Prepare
+    const parameters = {
+      '/foo/bar': {
+        maxAge: 1000,
+      },
+      '/foo/baz': {
+        maxAge: 2000,
+      }
+    };
+    const getParametersByNameSpy = jest.spyOn(SSMProvider.prototype, 'getParametersByName').mockImplementation();
+
+    // Act
+    await getParametersByName(parameters);
+
+    // Assess
+    expect(getParametersByNameSpy).toHaveBeenCalledWith(parameters, undefined);
+
+  });
+  
+  test('when called and a default provider exists, it uses it and returns the value', async () => {
+
+    // Prepare
+    const provider = new SSMProvider();
+    DEFAULT_PROVIDERS.ssm = provider;
+    const parameters = {
+      '/foo/bar': {
+        maxAge: 1000,
+      },
+      '/foo/baz': {
+        maxAge: 2000,
+      }
+    };
+    const getParametersByNameSpy = jest.spyOn(provider, 'getParametersByName').mockImplementation();
+
+    // Act
+    await getParametersByName(parameters);
+
+    // Assess
+    expect(getParametersByNameSpy).toHaveBeenCalledWith(parameters, undefined);
+    expect(DEFAULT_PROVIDERS.ssm).toBe(provider);
+
+  });
+
+});