diff --git a/src/components/Sidebar.vue b/src/components/Sidebar.vue
index b4a0a24..d401d10 100644
--- a/src/components/Sidebar.vue
+++ b/src/components/Sidebar.vue
@@ -17,21 +17,21 @@
 <template>
 	<section class="sidebar" role="none" ref="sidebar">
 		<header class="sidebar__buttons">
-			<button v-if="mapCount > 1 || serverCount > 1" class="button--maps" data-section="maps"
+			<button ref="maps-button" v-if="mapCount > 1 || serverCount > 1" class="button--maps" data-section="maps"
 			        :title="mapCount > 1 ? messageWorlds : messageServers"
 			        :aria-label="mapCount > 1 ? messageWorlds : messageServers"
 			        :aria-expanded="mapsVisible"
 			        @click="handleSectionClick" @keydown="handleSectionKeydown">
-				<SvgIcon :name="mapCount > 1 ? 'maps' : 'servers'"></SvgIcon>
+				<SvgIcon ref="maps-icon" :name="mapCount > 1 ? 'maps' : 'servers'"></SvgIcon>
 			</button>
-			<button v-if="markerUIEnabled" class="button--markers" data-section="markers"
+			<button ref="markers-button" v-if="markerUIEnabled" class="button--markers" data-section="markers"
 			        :title="messageMarkers"
 			        :aria-label="messageMarkers"
 			        :aria-expanded="markersVisible"
 			        @click="handleSectionClick" @keydown="handleSectionKeydown">
 				<SvgIcon name="marker_point"></SvgIcon>
 			</button>
-			<button v-if="playerMakersEnabled" class="button--players" data-section="players"
+			<button ref="players-button" v-if="playerMakersEnabled" class="button--players" data-section="players"
 			        :title="messagePlayers" :aria-label="messagePlayers" :aria-expanded="playersVisible"
 			        @click="handleSectionClick" @keydown="handleSectionKeydown">
 				<SvgIcon name="players"></SvgIcon>
diff --git a/test/components/PlayerImage.test.ts b/test/components/PlayerImage.test.ts
new file mode 100644
index 0000000..d5819c7
--- /dev/null
+++ b/test/components/PlayerImage.test.ts
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 James Lyne
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { mount } from '@vue/test-utils';
+import PlayerImage from '@/Components/PlayerImage.vue';
+import {getDefaultPlayerImage, getPlayerImage} from "@/util/images";
+import {useTestImageProvider} from "../helpers";
+
+describe('PlayerImage', async () => {
+	it('exists', () => {
+		expect(PlayerImage).toBeTruthy()
+	});
+
+	const player = {
+		name: 'gamer',
+		displayName: 'Gamer',
+		armor: 10,
+		health: 10,
+		sort: 1,
+		hidden: false,
+		location: {
+			x: 0,
+			y: 0,
+			z: 0,
+		}
+	},
+		wrapper = mount(PlayerImage, {
+			props: { player },
+		});
+
+	it('displays the default image', () => {
+		expect(wrapper.element.getAttribute('src')).toEqual(getDefaultPlayerImage())
+	});
+});
diff --git a/test/components/Sidebar.test.ts b/test/components/Sidebar.test.ts
new file mode 100644
index 0000000..bdfdbc4
--- /dev/null
+++ b/test/components/Sidebar.test.ts
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2022 James Lyne
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// @vitest-environment jsdom
+
+import {mount, VueWrapper} from '@vue/test-utils';
+import Sidebar from '@/Components/Sidebar.vue';
+import {addDynmapServer, addWorld, clearServers, clearWorlds, enablePlayerMarkers} from "../helpers";
+import {nextTick} from "vue";
+import {useStore} from "@/store";
+import {MutationTypes} from "@/store/mutation-types";
+
+describe('Sidebar', () => {
+  it('exists', () => {
+    expect(Sidebar).toBeTruthy()
+  });
+
+  let component: VueWrapper;
+
+  beforeEach(async () => {
+    clearServers();
+    clearWorlds();
+
+    //Add single dynmap server with single world
+    addDynmapServer(true);
+    addWorld('overworld', 1);
+
+    const host = document.createElement('div');
+    document.body.appendChild(host);
+
+    component = mount(Sidebar, {
+      attachTo: host,
+    });
+
+    useStore().commit(MutationTypes.SET_LOADED, undefined);
+
+    await nextTick();
+  });
+
+  describe('Maps button', () => {
+    it('not shown when single map and server exist', () =>
+        expect(component.find({ref: 'maps-button'}).exists()).toBeFalsy());
+
+    it('shown with server icon when multiple servers exist with single map', async () => {
+      addDynmapServer(false); //Extra server
+
+      await nextTick();
+
+      expect(component.find({ref: 'maps-button'}).exists()).toBeTruthy();
+      expect(component.getComponent({ref: 'maps-icon'}).props('name')).toBe("servers");
+    });
+
+    it('shown with map icon when multiple worlds defined', async () => {
+      addWorld('overworld', 1); //Extra world
+
+      await nextTick();
+
+      expect(component.find({ref: 'maps-button'}).exists()).toBeTruthy();
+      expect(component.getComponent({ref: 'maps-icon'}).props('name')).toBe("maps");
+    });
+
+    it('shown with map icon when single world with multiple maps defined', async () => {
+      clearWorlds();
+      addWorld('overworld', 2); //World with 2 maps
+
+      await nextTick();
+
+      expect(component.find({ref: 'maps-button'}).exists()).toBeTruthy();
+      expect(component.getComponent({ref: 'maps-icon'}).props('name')).toBe("maps");
+    });
+  });
+
+  describe('Players button', () => {
+    it('not shown when player markers are disabled', () => {
+      expect(component.find({ref: 'players-button'}).exists()).toBeFalsy();
+    });
+
+    it('shown when player markers are enabled', async () => {
+      enablePlayerMarkers();
+      await nextTick();
+
+      expect(component.find({ref: 'players-button'}).exists()).toBeTruthy();
+    });
+
+    it('moves focus to players section on down arrow press', async () => {
+      const button = component.find({ref: 'players-button'});
+      (button.element as HTMLElement).focus();
+      await button.trigger('keydown', {key: 'ArrowDown'})
+
+      expect(document.activeElement!.id).toEqual('players-heading');
+    });
+  });
+});
diff --git a/test/components/SvgIcon.test.ts b/test/components/SvgIcon.test.ts
new file mode 100644
index 0000000..5eabeee
--- /dev/null
+++ b/test/components/SvgIcon.test.ts
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2022 James Lyne
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { mount } from '@vue/test-utils';
+import SVGIcon from '@/Components/SVGIcon.vue';
+
+describe('SVGIcon', async () => {
+	it('exists', () => {
+		expect(SVGIcon).toBeTruthy()
+	});
+
+	const wrapper = mount(SVGIcon, {
+		props: {
+			name: 'maps',
+		},
+	});
+
+	it('displays the correct icon', () => {
+		expect(wrapper.find('use').attributes().href).toEqual('#icon--maps');
+	});
+
+	it('has the correct classname', () => {
+		expect(wrapper.element.classList.contains('svg-icon--maps')).toBeTruthy();
+	});
+
+	it('displays the correct icon when updated', async () => {
+		await wrapper.setProps({
+			name: 'servers',
+		});
+		expect(wrapper.find('use').attributes().href).toEqual('#icon--servers');
+	});
+
+	it('has the correct classname when updated', () => {
+		expect(wrapper.element.classList.contains('svg-icon--servers')).toBeTruthy();
+	});
+
+	it('doesn\'t render <title> when not provided', () => {
+		expect(wrapper.find('title').exists()).toBeFalsy();
+	});
+
+	it('renders <title> when provided', async () => {
+		await wrapper.setProps({
+			title: 'test icon title',
+		});
+		expect(wrapper.text()).toContain('test icon title');
+	});
+});
diff --git a/test/helpers.ts b/test/helpers.ts
new file mode 100644
index 0000000..7e9b219
--- /dev/null
+++ b/test/helpers.ts
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2022 James Lyne
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {useStore} from "@/store";
+import {MutationTypes} from "@/store/mutation-types";
+import {getDefaultPlayerImage} from "@/util/images";
+import {LiveAtlasDimension, LiveAtlasWorldDefinition, PlayerImageQueueEntry} from "../src";
+import LiveAtlasMapDefinition from "../src/model/LiveAtlasMapDefinition";
+
+export const enablePlayerMarkers = () => {
+	useStore().commit(MutationTypes.SET_COMPONENTS, {
+      players: {
+        markers: {
+          hideByDefault: false,
+          layerName: 'Players',
+          imageSize: 'large',
+          layerPriority: 0,
+          showHealth: true,
+          showArmor: true,
+          showYaw: false,
+        },
+        showImages: true,
+        grayHiddenPlayers: true,
+        imageUrl: getDefaultPlayerImage,
+      }
+    });
+};
+
+/**
+ * Clears any test servers added to the store
+ */
+export const clearServers = () => {
+    useStore().commit(MutationTypes.SET_SERVERS, new Map());
+};
+
+/**
+ * Adds a test Dynmap server definition to the store, optionally setting it as the current server
+ * @param setAsCurrent
+ */
+export const addDynmapServer = (setAsCurrent: boolean) => {
+    const store = useStore(),
+        servers = new Map(store.state.servers),
+        id = `dynmap_${servers.size}`;
+
+    servers.set(id, {
+        id,
+        label: `Dynmap ${servers.size}`,
+        dynmap: {
+            configuration: 'configuration',
+            update: 'update',
+            sendmessage: 'sendMessage',
+            login: 'login',
+            register: 'register',
+            tiles: 'tiles',
+            markers: 'markers',
+        }
+    })
+
+    useStore().commit(MutationTypes.SET_SERVERS, servers);
+
+    if(setAsCurrent) {
+        useStore().commit(MutationTypes.SET_CURRENT_SERVER, id);
+    }
+};
+
+/**
+ * Adds a test Pl3xmap server definition to the store, optionally setting it as the current server
+ * @param setAsCurrent
+ */
+export const addPl3xmapServer = (setAsCurrent: boolean) => {
+    const store = useStore(),
+        servers = new Map(store.state.servers),
+        id = `pl3xmap_${servers.size}`;
+
+    servers.set(id, {
+        id,
+        label: `Pl3xmap ${servers.size}`,
+        pl3xmap: 'pl3xmap',
+    });
+
+    useStore().commit(MutationTypes.SET_SERVERS, servers);
+
+    if(setAsCurrent) {
+        useStore().commit(MutationTypes.SET_CURRENT_SERVER, id);
+    }
+};
+
+/**
+ * Adds a test Overviewer server definition to the store, optionally setting it as the current server
+ * @param setAsCurrent
+ */
+export const addOverviewerServer = (setAsCurrent: boolean) => {
+    const store = useStore(),
+        servers = new Map(store.state.servers),
+        id = `overviewer_${servers.size}`;
+
+    servers.set(id, {
+        id,
+        label: `Overviewer ${servers.size}`,
+        overviewer: 'overviewer',
+    });
+
+    useStore().commit(MutationTypes.SET_SERVERS, servers);
+
+    if(setAsCurrent) {
+        useStore().commit(MutationTypes.SET_CURRENT_SERVER, id);
+    }
+};
+
+/**
+ * Clears any test worlds added to the store
+ */
+export const clearWorlds = () => {
+    useStore().commit(MutationTypes.SET_WORLDS, [])
+}
+
+/**
+ * Adds a test world to the store with the given dimension and number of test maps
+ * @param dimension
+ * @param mapCount
+ */
+export const addWorld = (dimension: LiveAtlasDimension, mapCount: number) => {
+    const store = useStore(),
+        worlds = [...store.state.worlds.values()],
+        world: LiveAtlasWorldDefinition = {
+			name: `${dimension}_${worlds.length}`,
+			displayName: `${dimension} ${worlds.length}`,
+			dimension,
+			seaLevel: 64,
+			maps: new Set()
+		};
+
+    for(let i = 0; i < mapCount; i++) {
+        world.maps.add(new LiveAtlasMapDefinition({
+            name: `map_${i}`,
+            world,
+            baseUrl: 'test/',
+            tileSize: 128,
+            imageFormat: 'png',
+            nativeZoomLevels: 1
+        }));
+    }
+
+    worlds.push(world);
+    store.commit(MutationTypes.SET_WORLDS, worlds);
+};
+
+export const useDefaultImageProvider = () => {
+    const store = useStore();
+
+    store.commit(MutationTypes.SET_COMPONENTS, {
+        players: Object.assign({
+            imageUrl: getDefaultPlayerImage
+        }, store.state.components.players)
+    });
+}
+
+export const useTestImageProvider = (): (entry: PlayerImageQueueEntry) => string => {
+    const provider = (entry: PlayerImageQueueEntry) => `/test/${entry.name}`,
+        store = useStore();
+
+    store.commit(MutationTypes.SET_COMPONENTS, {
+        players: Object.assign({
+            imageUrl: provider
+        }, store.state.components.players)
+    });
+
+    return provider;
+}
diff --git a/test/util.test.ts b/test/util.test.ts
index 064056e..a32d5e4 100644
--- a/test/util.test.ts
+++ b/test/util.test.ts
@@ -14,8 +14,10 @@
  * limitations under the License.
  */
 
-import {parseUrl} from "@/util";
-import {LiveAtlasParsedUrl} from "@/index";
+import {getGlobalMessages, getMessages, getUrlForLocation, guessWorldDimension, parseUrl} from "@/util";
+import {LiveAtlasDimension, LiveAtlasGlobalMessageConfig, LiveAtlasMessageConfig, LiveAtlasParsedUrl} from "@/index";
+import LiveAtlasMapDefinition from "@/model/LiveAtlasMapDefinition";
+import {globalMessages, serverMessages} from "../messages";
 
 const validURLs: [string, URL, LiveAtlasParsedUrl][] = [
 	[
@@ -392,3 +394,72 @@ describe("parseURL", () => {
 		expect(parseUrl(url)).toEqual(expected);
 	});
 });
+
+describe("guessWorldDimension", () => {
+	const worlds: [string, LiveAtlasDimension][] = [
+		['world', 'overworld'],
+		['smp2022', 'overworld'],
+		['DIM-1', 'nether'],
+		['world_nether', 'nether'],
+		['smp_nether', 'nether'],
+		['smpnether', 'nether'],
+		['nether_smp', 'nether'],
+		['DIM1', 'end'],
+		['world_the_end', 'end'],
+		['end', 'end'],
+		['smp_end', 'end'],
+		['smpend', 'overworld'], //Would have too many false positives
+		['end_smp', 'end'],
+	];
+
+	test.each(worlds)('%s -> %s', (input: string, expected: LiveAtlasDimension) =>
+		expect(guessWorldDimension(input)).toBe(expected))
+})
+
+
+test("getUrlForLocation", () => {
+	const map = new LiveAtlasMapDefinition({
+		name: 'test_map',
+		world: {
+			name: 'test_world',
+			displayName: 'Test World',
+			dimension: 'overworld',
+			seaLevel: 64,
+			maps: new Set()
+		},
+		baseUrl: 'test/',
+		tileSize: 128,
+		imageFormat: 'png',
+		nativeZoomLevels: 1
+	});
+
+	expect(getUrlForLocation(map, {x: 100, y: 68.5, z: -2300.3}, 3))
+		.toEqual('#test_world;test_map;100,69,-2300;3')
+});
+
+test("getMessages", () => {
+	const expectedGlobal: LiveAtlasGlobalMessageConfig = globalMessages.reduce((result: any, key) => {
+		result[key] = `Missing message: ${key}`;
+		return result;
+	}, {});
+	const expectedMessages: LiveAtlasMessageConfig = Object.assign({}, expectedGlobal, serverMessages.reduce((result: any, key) => {
+		result[key] = `Missing message: ${key}`;
+		return result;
+	}, {}));
+
+	const input: any = {
+		extraProperty: true, //Invalid message key
+		serversHeading: undefined, // Valid message key but undefined
+		mapTitle: null, // Valid message key but null
+		loginTitle: '', // Valid message key but empty string
+		registerConfirmPasswordLabel: {invalid: true}, //Valid message key but not a string,
+		chatErrorDisabled: 'test defined global message', // Valid global message
+		chatPlayerQuit: 'test defined server message' // Valid server message
+	};
+
+	expectedGlobal.chatErrorDisabled = expectedMessages.chatErrorDisabled = input.chatErrorDisabled;
+	expectedMessages.chatPlayerQuit = input.chatPlayerQuit;
+
+	expect(getMessages(input)).toEqual(expectedMessages);
+	expect(getGlobalMessages(input)).toEqual(expectedGlobal);
+});