any-of: test added for erroring out when no wrapped plugins configured (ref. #21)

__tests__/plugins/any-of.test.js

@@ -83,7 +83,23 @@ describe("plugin: any-of", () => {
     expect(LibResilientPluginConstructors.get('any-of')(LR, init).name).toEqual('any-of');
   });
   
-  test("it should return data from fetch()", async () => {
+  test("it should throw an error when there aren't any wrapped plugins configured", async () => {
+    require("../../plugins/any-of.js");
+    init = {
+        name: 'any-of',
+        uses: []
+    }
+    
+    expect.assertions(2);
+    try {
+      await LibResilientPluginConstructors.get('any-of')(LR, init).fetch('https://resilient.is/test.json')
+    } catch (e) {
+      expect(e).toBeInstanceOf(Error)
+      expect(e.toString()).toMatch('No wrapped plugins configured!')
+    }
+  });
+  
+  test("it should return data from a wrapped plugin", async () => {
     require("../../plugins/any-of.js");
     
     const response = await LibResilientPluginConstructors.get('any-of')(LR, init).fetch('https://resilient.is/test.json');
@@ -93,7 +109,7 @@ describe("plugin: any-of", () => {
     expect(response.url).toEqual('https://resilient.is/test.json')
   });
   
-  test("it should return data from fetch()", async () => {
+  test("it should pass Request() init data onto wrapped plugins", async () => {
     require("../../plugins/any-of.js");
     
     var initTest = {