Add bodyParser tests

src/middleware/jsonBodyParser/jsonBodyParser.ts

@@ -26,8 +26,8 @@ export const DefaultJsonBodyParserOptions: OptionsJson = {
  * @returns The combined JSON Body Parser options with the supplied values taking
  * precedence over the default
  */
-export const getJsonBodyParserOptions = (options: Partial<OptionsJson>): OptionsJson => {
-  return { ...DefaultJsonBodyParserOptions, ...options }
+export const getJsonBodyParserOptions = (options?: Partial<OptionsJson>): OptionsJson => {
+  return options ? { ...DefaultJsonBodyParserOptions, ...options } : DefaultJsonBodyParserOptions
 }
 
 /**

src/middleware/jsonBodyParser/spec/jsonBodyParser.spec.ts

@@ -0,0 +1,20 @@
+import { DefaultJsonBodyParserOptions, getJsonBodyParserOptions } from '../jsonBodyParser'
+
+describe('jsonBodyParser', () => {
+  describe('getJsonBodyParserOptions', () => {
+    it('returns default options if none supplied', () => {
+      // Act
+      const result = getJsonBodyParserOptions()
+      // Assert
+      expect(result).toEqual(DefaultJsonBodyParserOptions)
+    })
+    it('returns merged options if options supplied', () => {
+      // Arrange
+      const options = { limit: '1mb' }
+      // Act
+      const result = getJsonBodyParserOptions(options)
+      // Assert
+      expect(result).toEqual({ ...DefaultJsonBodyParserOptions, ...options })
+    })
+  })
+})