rename humanTimestamp to getTimeFromTimestamp and add a test

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

src/components/log/LiveLog.tsx

@@ -11,7 +11,7 @@
 import React, { Component } from "react";
 import { animateScroll } from "react-scroll";
 import { WithAPIData } from "../common/WithAPIData";
-import { humanTimestamp } from "../../util/dateUtils";
+import { getTimeFromTimestamp } from "../../util/dateUtils";
 import api from "../../util/api";
 
 export interface LiveLogProps {
@@ -44,7 +44,7 @@ class LiveLog extends Component<LiveLogProps, {}> {
     nextId = this.props.nextID;
 
     log.map(item =>
-      logHistory.push(humanTimestamp(item.timestamp) + " " + item.message)
+      logHistory.push(getTimeFromTimestamp(item.timestamp) + " " + item.message)
     );
 
     const outputStyle = {

src/util/__tests__/dateUtils.test.tsx

@@ -0,0 +1,19 @@
+/* Pi-hole: A black hole for Internet advertisements
+ * (c) 2019 Pi-hole, LLC (https://pi-hole.net)
+ * Network-wide ad blocking via your own hardware.
+ *
+ * Web Interface
+ * Date/Time utility tests
+ *
+ * This file is copyright under the latest version of the EUPL.
+ * Please see LICENSE file for your rights under this license. */
+
+import { getTimeFromTimestamp } from "../dateUtils";
+
+const timestamp = 1574713854;
+
+describe("humanTimestamp", () => {
+  it("returns the time 20:30:54 from the input 1574713854", () => {
+    expect(getTimeFromTimestamp(timestamp)).toEqual("20:30:54");
+  });
+});

src/util/dateUtils.tsx

@@ -8,7 +8,7 @@
  * This file is copyright under the latest version of the EUPL.
  * Please see LICENSE file for your rights under this license. */
 
-export function humanTimestamp(input: number) {
+export function getTimeFromTimestamp(input: number) {
   var date = new Date(input * 1000);
   var hours = date.getHours();
   var minutes = "0" + date.getMinutes();