Fix the unit test toBeCalledWith deprecated warnings (#182)

# Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

- Fix the unit tests "toBeCalledWith" assert being deprecated
- Update the "sortBy" variable to be a string literal
- Add an output to file option to the CLI
- Reorganise the code so there's less repeated code
- Update the tests so the CLI logic is tested quicker

#138, #76, #80

## Type of change

Please delete options that are not relevant.

- [x] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [x] This change requires a documentation update

# How Has This Been Tested?

Please describe the tests that you ran to verify the changes. Provide instructions so we can reproduce. Please also list any relevant details to your test configuration.

# Checklist

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that provde my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream modules

Reviewed-on: #182
Reviewed-by: VylpesTester <tester@vylpes.com>
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

src/cli.ts

@@ -2,6 +2,7 @@ import { Command, Option } from "commander";
 import randomBunny from "./index";
 import ICliOptions from "./contracts/ICliOptions";
 import { exit } from "process";
+import CliHelper from "./helpers/cliHelper";
 
 const program = new Command();
 
@@ -12,6 +13,7 @@ program
     .option('-s, --subreddit <subreddit>', 'The subreddit to search', 'rabbits')
     .option('-j, --json', 'Output as JSON')
     .option('-q, --query-metadata', 'Include query metadata in result')
+    .option('-o <file>', 'Output to file')
     .addOption(new Option('--sort <sort>', 'Sort by').default('hot').choices(['hot', 'new', 'top']));
 
 program.parse();
@@ -19,38 +21,4 @@ program.parse();
 const options: ICliOptions = program.opts();
 
 randomBunny(options.subreddit, options.sort)
-    .then((response) => {
-        if (response.IsSuccess) {
-            const result = response.Result!;
-
-            const outputLines: string[] = [];
-
-            if (options.json) {
-                console.log(JSON.stringify(result));
-                return;
-            }
-
-            outputLines.push(`Archived = ${result.Archived}`);
-            outputLines.push(`Downvotes = ${result.Downs}`);
-            outputLines.push(`Hidden = ${result.Hidden}`);
-            outputLines.push(`Permalink = ${result.Permalink}`);
-            outputLines.push(`Subreddit = ${result.Subreddit}`);
-            outputLines.push(`Subreddit Subscribers = ${result.SubredditSubscribers}`);
-            outputLines.push(`Title = ${result.Title}`);
-            outputLines.push(`Upvotes = ${result.Ups}`);
-            outputLines.push(`Url = ${result.Url}`);
-
-            if (options.queryMetadata != null) {
-                outputLines.push(`Query.Subreddit = ${response.Query.subreddit}`);
-                outputLines.push(`Query.Sort By = ${response.Query.sortBy}`);
-            }
-
-            console.log(outputLines.join("\n"));
-            exit(0);
-        } else {
-            const error = response.Error!;
-
-            console.error(error.Message, error.Code);
-            exit(1);
-        }
-    });
+    .then((response) => exit(CliHelper.Endpoint(response, options)));

src/contracts/ICliOptions.ts

@@ -1,6 +1,7 @@
 export default interface ICliOptions {
     subreddit: string,
     json?: boolean,
-    sort: string,
+    sort: "new" | "hot" | "top",
+    o?: string,
     queryMetadata?: boolean,
 }

src/helpers/cliHelper.ts

@@ -0,0 +1,25 @@
+import { writeFileSync } from "fs";
+import ICliOptions from "../contracts/ICliOptions";
+import IReturnResult from "../contracts/IReturnResult";
+import OutputHelper from "./outputHelper";
+
+export default class CliHelper {
+    public static Endpoint(response: IReturnResult, options: ICliOptions): number {
+        if (response.IsSuccess) {
+            const output = OutputHelper.GenerateOutput(response, options);
+
+            if (options.o) {
+                writeFileSync(options.o, output);
+            } else {
+                console.log(output);
+            }
+
+            return 0;
+        } else {
+            const error = response.Error!;
+
+            console.error(error.Message, error.Code);
+            return 1;
+        }
+    }
+}

src/helpers/outputHelper.ts

@@ -0,0 +1,31 @@
+import ICliOptions from "../contracts/ICliOptions";
+import IReturnResult from "../contracts/IReturnResult";
+
+export default class OutputHelper {
+    public static GenerateOutput(response: IReturnResult, options: ICliOptions): string {
+        const result = response.Result!;
+
+        const outputLines: string[] = [];
+
+        if (options.json) {
+            return JSON.stringify(result);
+        }
+
+        outputLines.push(`Archived = ${result.Archived}`);
+        outputLines.push(`Downvotes = ${result.Downs}`);
+        outputLines.push(`Hidden = ${result.Hidden}`);
+        outputLines.push(`Permalink = ${result.Permalink}`);
+        outputLines.push(`Subreddit = ${result.Subreddit}`);
+        outputLines.push(`Subreddit Subscribers = ${result.SubredditSubscribers}`);
+        outputLines.push(`Title = ${result.Title}`);
+        outputLines.push(`Upvotes = ${result.Ups}`);
+        outputLines.push(`Url = ${result.Url}`);
+
+        if (options.queryMetadata != null) {
+            outputLines.push(`Query.Subreddit = ${response.Query.subreddit}`);
+            outputLines.push(`Query.Sort By = ${response.Query.sortBy}`);
+        }
+
+        return outputLines.join("\n");
+    }
+}

src/index.ts

@@ -5,17 +5,9 @@ import { List } from 'linqts';
 import IFetchResult from "./contracts/IFetchResult";
 import { ErrorCode } from "./constants/ErrorCode";
 import ErrorMessages from "./constants/ErrorMessages";
-import ImageHelper from "./imageHelper";
-
-const sortable = [
-    'new',
-    'hot',
-    'top'
-];
-
-export default async function randomBunny(subreddit: string, sortBy: string = 'hot'): Promise<IReturnResult> {
-    if (!sortable.includes(sortBy)) sortBy = 'hot';
+import ImageHelper from "./helpers/imageHelper";
 
+export default async function randomBunny(subreddit: string, sortBy: "new" | "hot" | "top" = 'hot'): Promise<IReturnResult> {
     const result = await fetch(`https://reddit.com/r/${subreddit}/${sortBy}.json?limit=100`)
         .then((res) => {
             return res;