Add tests

.eslintrc.js

@@ -1,34 +1,9 @@
 module.exports = {
   extends: ["eslint:recommended", "plugin:react-hooks/recommended"],
   rules: {
-    orderedImports: true,
-    completedDocs: [
-      true,
-      {
-        enums: true,
-        functions: {
-          visibilities: ["exported"],
-        },
-        interfaces: {
-          visibilities: ["exported"],
-        },
-        methods: {
-          tags: {
-            content: {},
-            existence: ["inheritdoc", "override"],
-          },
-        },
-        types: {
-          visibilities: ["exported"],
-        },
-        variables: {
-          visibilities: ["exported"],
-        },
-      },
-    ],
-    maxClassesPerFile: false,
-    maxLineLength: false,
-    memberOrdering: false,
-    variableName: false,
+    maxClassesPerFile: 0,
+    maxLineLength: 0,
+    memberOrdering: 0,
+    variableName: 0,
   },
 };

src/components/app.tsx

@@ -1,4 +1,3 @@
-import { useEffect } from "react";
 import Icon from "./icon";
 import styled from "styled-components";
 import selectedTheme from "../lib/theme";

src/components/icon.tsx

@@ -8,6 +8,7 @@ interface IIconProps {
 }
 
 interface IIconButtonProps {
+  testid?: string;
   icon: string;
   onClick: (e: React.FormEvent) => void;
 }
@@ -38,7 +39,7 @@ const IconContainer = styled.i`
   text-rendering: optimizeLegibility;
   -moz-osx-font-smoothing: grayscale;
   font-feature-settings: "liga";
-  font-size: ${(props) => props.theme};
+  font-size: ${(props) => props.about};
   color: ${(props) => props.color};
 `;
 
@@ -48,7 +49,7 @@ const IconContainer = styled.i`
  * @returns {React.ReactNode} the icon node
  */
 export const Icon = ({ name, size }: IIconProps) => (
-  <IconContainer color={selectedTheme.mainColor} theme={size}>
+  <IconContainer color={selectedTheme.mainColor} about={size}>
     {name}
   </IconContainer>
 );
@@ -58,8 +59,8 @@ export const Icon = ({ name, size }: IIconProps) => (
  * @param {IIconProps} props - The props of the given IconButton
  * @returns {React.ReactNode} the icon button node
  */
-export const IconButton = ({ icon, onClick }: IIconButtonProps) => (
-  <StyledButton onClick={onClick}>
+export const IconButton = ({ testid, icon, onClick }: IIconButtonProps) => (
+  <StyledButton data-testid={testid} onClick={onClick}>
     <Icon name={icon} />
   </StyledButton>
 );

src/components/imprint.tsx

@@ -41,7 +41,7 @@ export interface IImprintProps {
   text: string;
 }
 
-interface IImprintComponentProps {
+export interface IImprintComponentProps {
   imprint: IImprintProps;
 }
 
@@ -59,7 +59,7 @@ interface IImprintFieldProps {
  * @param {IImprintFieldComponentProps} props data for the field
  * @returns {React.ReactNode} the imprint field component
  */
-const ImprintField = ({ field }: IImprintFieldComponentProps) => (
+export const ImprintField = ({ field }: IImprintFieldComponentProps) => (
   <Link href={field.link}>{field.text}</Link>
 );
 
@@ -82,8 +82,10 @@ const Imprint = ({ imprint }: IImprintComponentProps) => (
             condition={!window.location.href.endsWith("#imprint")}
             onClose={() => {
               if (window.location.href.endsWith("#imprint")) {
-                let location = window.location.href.replace("#imprint", "");
-                window.location.href = location;
+                window.location.href = window.location.href.replace(
+                  "#imprint",
+                  "",
+                );
               }
             }}
           >

src/components/modal.tsx

@@ -38,7 +38,7 @@ const TitleContainer = styled.div`
   justify-content: space-between;
 `;
 
-interface IModalProps {
+export interface IModalProps {
   element: string;
   icon?: string;
   text?: string;
@@ -72,15 +72,27 @@ const Modal = ({
   return (
     <>
       {element === "icon" && (
-        <IconButton icon={icon ?? ""} onClick={() => closeModal()} />
+        <IconButton
+          icon={icon ?? ""}
+          testid="toggle-button"
+          onClick={() => closeModal()}
+        />
       )}
 
-      {element === "text" && <Text onClick={() => closeModal()}>{text}</Text>}
+      {element === "text" && (
+        <Text data-testid="toggle-button" onClick={() => closeModal()}>
+          {text}
+        </Text>
+      )}
 
       <ModalContainer hidden={modalHidden}>
         <TitleContainer>
           <Headline>{title}</Headline>
-          <IconButton icon="close" onClick={() => closeModal()} />
+          <IconButton
+            icon="close"
+            testid="close-button"
+            onClick={() => closeModal()}
+          />
         </TitleContainer>
         {children}
       </ModalContainer>

src/components/searchBar.tsx

@@ -43,10 +43,35 @@ export interface ISearchProviderProps {
   prefix: string;
 }
 
-interface ISearchBarProps {
+export interface ISearchBarProps {
   providers: Array<ISearchProviderProps> | undefined;
 }
 
+export const handleQueryWithProvider = (
+  providers: Array<ISearchProviderProps> | undefined,
+  query: string,
+) => {
+  let queryArray: Array<string> = query.split(" ");
+  let prefix: string = queryArray[0];
+
+  queryArray.shift();
+
+  let searchQuery: string = queryArray.join(" ");
+
+  let providerFound: boolean = false;
+  if (providers) {
+    providers.forEach((provider: ISearchProviderProps) => {
+      if (provider.prefix === prefix) {
+        providerFound = true;
+        window.location.href = provider.url + searchQuery;
+      }
+    });
+  }
+
+  if (!providerFound)
+    window.location.href = "https://google.com/search?q=" + query;
+};
+
 /**
  * Renders a search bar
  * @param {ISearchBarProps} props - The search providers for the search bar to use
@@ -61,7 +86,7 @@ const SearchBar = ({ providers }: ISearchBarProps) => {
     var query: string = input || "";
 
     if (query.split(" ")[0].includes("/")) {
-      handleQueryWithProvider(query);
+      handleQueryWithProvider(providers, query);
     } else {
       window.location.href = "https://google.com/search?q=" + query;
     }
@@ -69,32 +94,11 @@ const SearchBar = ({ providers }: ISearchBarProps) => {
     e.preventDefault();
   };
 
-  const handleQueryWithProvider = (query: string) => {
-    let queryArray: Array<string> = query.split(" ");
-    let prefix: string = queryArray[0];
-
-    queryArray.shift();
-
-    let searchQuery: string = queryArray.join(" ");
-
-    let providerFound: boolean = false;
-    if (providers) {
-      providers.forEach((provider: ISearchProviderProps) => {
-        if (provider.prefix === prefix) {
-          providerFound = true;
-          window.location.href = provider.url + searchQuery;
-        }
-      });
-    }
-
-    if (!providerFound)
-      window.location.href = "https://google.com/search?q=" + query;
-  };
-
   return (
     <Search onSubmit={(e) => handleSearchQuery(e)}>
       <SearchInput
         type="text"
+        data-testid="search-input"
         value={input}
         onChange={(e: React.ChangeEvent<HTMLInputElement>) =>
           setInput(e.target.value)
@@ -102,12 +106,17 @@ const SearchBar = ({ providers }: ISearchBarProps) => {
       ></SearchInput>
       <SearchButton
         type="button"
+        data-testid="search-clear"
         onClick={() => setInput("")}
         hidden={buttonsHidden}
       >
         Clear
       </SearchButton>
-      <SearchButton type="submit" hidden={buttonsHidden}>
+      <SearchButton
+        type="submit"
+        data-testid="search-submit"
+        hidden={buttonsHidden}
+      >
         Search
       </SearchButton>
     </Search>

src/components/settings.tsx

@@ -4,47 +4,51 @@ import styled from "styled-components";
 import Select, { ValueType } from "react-select";
 
 import { ISearchProviderProps } from "./searchBar";
-import selectedTheme, { setTheme, IThemeProps } from "../lib/theme";
+import selectedTheme, {
+  defaultTheme,
+  setTheme,
+  IThemeProps,
+} from "../lib/theme";
 import { Button, SubHeadline } from "./elements";
 
 import Modal from "./modal";
 
-const FormContainer = styled.div`
+export const FormContainer = styled.div`
   display: grid;
   grid-template-columns: auto auto auto;
 `;
 
-const Table = styled.table`
+export const Table = styled.table`
   font-weight: 400;
   background: none;
   color: ${selectedTheme.mainColor};
 `;
 
-const TableRow = styled.tr`
+export const TableRow = styled.tr`
   border-bottom: 1px solid ${selectedTheme.mainColor};
 `;
 
-const TableCell = styled.td`
+export const TableCell = styled.td`
   background: none;
   padding-top: 0.5rem;
 `;
 
-const HeadCell = styled.th`
+export const HeadCell = styled.th`
   font-weight: 700;
   background: none;
 `;
 
-const Section = styled.div`
+export const Section = styled.div`
   padding: 1rem 0;
 `;
 
-const SectionHeadline = styled(SubHeadline)`
+export const SectionHeadline = styled(SubHeadline)`
   width: 100%;
   border-bottom: 1px solid ${selectedTheme.accentColor};
   margin-bottom: 0.5rem;
 `;
 
-const SelectorStyle: any = {
+export const SelectorStyle: any = {
   container: (base: any): any => ({
     ...base,
     margin: "0 2px",
@@ -113,7 +117,7 @@ interface ISettingsProps {
  * @param {Array<ISearchProviderProps>} providers - the list of search providers
  */
 const Settings = ({ themes, providers }: ISettingsProps) => {
-  const [newTheme, setNewTheme] = useState<IThemeProps>();
+  const [newTheme, setNewTheme] = useState<IThemeProps>(defaultTheme);
 
   if (themes || providers) {
     return (
@@ -123,6 +127,7 @@ const Settings = ({ themes, providers }: ISettingsProps) => {
             <SectionHeadline>Theme:</SectionHeadline>
             <FormContainer>
               <Select
+                classNamePrefix="list"
                 options={themes}
                 defaultValue={selectedTheme}
                 onChange={(e: ValueType<IThemeProps, false>) => {
@@ -130,10 +135,18 @@ const Settings = ({ themes, providers }: ISettingsProps) => {
                 }}
                 styles={SelectorStyle}
               />
-              <Button onClick={() => setTheme(JSON.stringify(newTheme))}>
+              <Button
+                data-testid="button-submit"
+                onClick={() => setTheme(newTheme)}
+              >
                 Apply
               </Button>
-              <Button onClick={() => window.location.reload()}>Refresh</Button>
+              <Button
+                data-testid="button-refresh"
+                onClick={() => window.location.reload()}
+              >
+                Refresh
+              </Button>
             </FormContainer>
           </Section>
         )}

src/lib/fetcher.tsx

@@ -17,7 +17,7 @@ const inProduction = process.env.NODE_ENV === "production";
  * @returns - The response in JSON
  * @throws - Error with given error message if request failed
  */
-const handleResponse = (response: Response) => {
+export const handleResponse = (response: Response) => {
   if (response.ok) return response.json();
   throw new Error(errorMessage);
 };
@@ -56,7 +56,7 @@ export interface IGreeterDataProps {
 /**
  * Default values for the respective state variables
  */
-const defaults = {
+export const defaults = {
   app: {
     categories: [],
     apps: [],
@@ -143,7 +143,7 @@ const defaults = {
  * @param {string} type - The type of fetch request that threw an error
  * @param {Error} error - The error itself
  */
-const handleError = (status: string, error: Error) => {
+export const handleError = (status: string, error: Error) => {
   switch (status) {
     case "apps":
       return { ...defaults.app, error: error.message };
@@ -165,7 +165,7 @@ const handleError = (status: string, error: Error) => {
 /**
  * Fetches all of the data by doing fetch requests (only available in production)
  */
-const fetchProduction = Promise.all([
+export const fetchProduction = Promise.all([
   fetch("/data/apps.json")
     .then(handleResponse)
     .catch((error: Error) => handleError("apps", error)),
@@ -189,7 +189,7 @@ const fetchProduction = Promise.all([
 /**
  * Fetches all of the data by importing it (only available in development)
  */
-const fetchDevelopment = Promise.all([
+export const fetchDevelopment = Promise.all([
   import("../data/apps.json"),
   import("../data/bookmarks.json"),
   import("../data/search.json"),

src/lib/theme.tsx

@@ -6,7 +6,7 @@ export interface IThemeProps {
   backgroundColor: string;
 }
 
-const defaultTheme: IThemeProps = {
+export const defaultTheme: IThemeProps = {
   label: "Classic",
   value: 0,
   mainColor: "#000000",
@@ -18,8 +18,8 @@ const defaultTheme: IThemeProps = {
  * Writes a given theme into localStorage
  * @param {string} theme - the theme that shall be saved (in stringified JSON)
  */
-export const setTheme = (theme: string) => {
-  if (theme !== undefined) localStorage.setItem("theme", theme);
+export const setTheme = (theme: IThemeProps) => {
+  localStorage.setItem("theme", JSON.stringify(theme));
   window.location.reload();
 };
 
@@ -30,9 +30,8 @@ export const setTheme = (theme: string) => {
 export const getTheme = (): IThemeProps => {
   let selectedTheme = defaultTheme;
 
-  if (localStorage.getItem("theme") !== null) {
-    selectedTheme = JSON.parse(localStorage.getItem("theme") || "{}");
-  }
+  let theme = localStorage.getItem("theme");
+  if (theme !== null) selectedTheme = JSON.parse(theme || "{}");
 
   return selectedTheme;
 };

src/test/components/__snapshots__/elements.spec.tsx.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Tests Button 1`] = `[Function]`;
+
+exports[`Tests Headline 1`] = `[Function]`;
+
+exports[`Tests Lists 1`] = `[Function]`;
+
+exports[`Tests SubHeadline 1`] = `[Function]`;

src/test/components/__snapshots__/imprint.spec.tsx.snap

@@ -0,0 +1,5 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`imprint.tsx Tests Imprint 1`] = `[Function]`;
+
+exports[`imprint.tsx Tests ImprintField 1`] = `[Function]`;

src/test/components/__snapshots__/modal.spec.tsx.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`modal.tsx Tests modal with icon 1`] = `[Function]`;
+
+exports[`modal.tsx Tests modal with icon button 1`] = `[Function]`;
+
+exports[`modal.tsx Tests modal with neither 1`] = `[Function]`;
+
+exports[`modal.tsx Tests modal with text button 1`] = `[Function]`;

src/test/components/__snapshots__/searchBar.spec.tsx.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`searchBar.tsx Tests SearchBar rendering 1`] = `[Function]`;

src/test/components/__snapshots__/settings.spec.tsx.snap

@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`settings.tsx Tests forms 1`] = `[Function]`;
+
+exports[`settings.tsx Tests sections 1`] = `[Function]`;
+
+exports[`settings.tsx Tests settings rendering 1`] = `[Function]`;
+
+exports[`settings.tsx Tests settings rendering 2`] = `[Function]`;
+
+exports[`settings.tsx Tests settings rendering 3`] = `[Function]`;
+
+exports[`settings.tsx Tests settings rendering 4`] = `[Function]`;
+
+exports[`settings.tsx Tests tables 1`] = `[Function]`;

src/test/components/elements.spec.tsx

@@ -0,0 +1,39 @@
+import { render } from "@testing-library/react";
+import {
+  ListContainer,
+  Headline,
+  SubHeadline,
+  ItemList,
+  Item,
+  Button,
+} from "../../components/elements";
+
+it("Tests Lists", () => {
+  const { asFragment } = render(
+    <ListContainer>
+      <ItemList>
+        <Item>Test</Item>
+      </ItemList>
+    </ListContainer>,
+  );
+
+  expect(asFragment).toMatchSnapshot();
+});
+
+it("Tests Headline", () => {
+  const { asFragment } = render(<Headline>Test</Headline>);
+
+  expect(asFragment).toMatchSnapshot();
+});
+
+it("Tests SubHeadline", () => {
+  const { asFragment } = render(<SubHeadline>Test</SubHeadline>);
+
+  expect(asFragment).toMatchSnapshot();
+});
+
+it("Tests Button", () => {
+  const { asFragment } = render(<Button>Test</Button>);
+
+  expect(asFragment).toMatchSnapshot();
+});

src/test/components/imprint.spec.tsx

@@ -0,0 +1,61 @@
+import { fireEvent, render } from "@testing-library/react";
+import Imprint, { IImprintProps, ImprintField } from "../../components/imprint";
+
+const props: IImprintProps = {
+  name: {
+    text: "Test Name",
+    link: "#",
+  },
+  address: {
+    text: "Test Address",
+    link: "#",
+  },
+  phone: {
+    text: "Test Phone",
+    link: "#",
+  },
+  email: {
+    text: "Test Email",
+    link: "#",
+  },
+  url: {
+    text: "Test URL",
+    link: "#",
+  },
+  text: "This is a test!",
+};
+
+describe("imprint.tsx", () => {
+  beforeEach(() => {
+    delete global.window.location;
+    global.window = Object.create(window);
+    global.window.location = {
+      port: "123",
+      protocol: "http:",
+      hostname: "localhost",
+      href: "test",
+    };
+  });
+
+  it("Tests Imprint", () => {
+    const { asFragment } = render(<Imprint imprint={props} />);
+    expect(asFragment).toMatchSnapshot();
+  });
+
+  it("Tests #imprint", () => {
+    const location = window.location.href;
+    window.location.href = location + "#imprint";
+
+    const imprintModal = render(<Imprint imprint={props} />);
+
+    fireEvent.click(imprintModal.getByTestId("toggle-button"));
+    //fireEvent.click(imprintModal.getByTestId("close-button"));
+
+    expect(window.location.href).toEqual(location);
+  });
+
+  it("Tests ImprintField", () => {
+    const { asFragment } = render(<ImprintField field={props.name} />);
+    expect(asFragment).toMatchSnapshot();
+  });
+});

src/test/components/modal.spec.tsx

@@ -0,0 +1,78 @@
+import { fireEvent, render } from "@testing-library/react";
+import Modal, { IModalProps } from "../../components/modal";
+
+const iconProps: IModalProps = {
+  element: "icon",
+  icon: "bug_report",
+  title: "Test Modal",
+  onClose: jest.fn(),
+  children: <p>Hello</p>,
+};
+
+const invalidIconProps: IModalProps = {
+  element: "icon",
+  title: "Test Modal",
+  onClose: jest.fn(),
+  children: <p>Hello</p>,
+};
+
+const textProps: IModalProps = {
+  element: "text",
+  text: "Test",
+  title: "Test Modal",
+  onClose: jest.fn(),
+  children: <p>Hello</p>,
+};
+
+const noneProps: IModalProps = {
+  element: "none",
+  title: "Test Modal",
+  children: <p>Hello</p>,
+};
+
+const setup = (props: IModalProps) => {
+  const modal = render(
+    <Modal
+      element={props.element}
+      icon={props.icon}
+      text={props.text}
+      title={props.title}
+      onClose={props.onClose}
+    >
+      {props.children}
+    </Modal>,
+  );
+
+  return modal;
+};
+
+describe("modal.tsx", () => {
+  it("Tests modal with icon button", () => {
+    const modal = setup(iconProps);
+    expect(modal.asFragment).toMatchSnapshot();
+    fireEvent.click(modal.getByTestId("toggle-button"));
+    fireEvent.click(modal.getByTestId("close-button"));
+    expect(iconProps.onClose).toHaveBeenCalledTimes(2);
+  });
+
+  it("Tests modal with text button", () => {
+    const modal = setup(textProps);
+    expect(modal.asFragment).toMatchSnapshot();
+    fireEvent.click(modal.getByTestId("toggle-button"));
+    fireEvent.click(modal.getByTestId("close-button"));
+    expect(textProps.onClose).toHaveBeenCalledTimes(2);
+  });
+
+  it("Tests modal with neither", () => {
+    const modal = setup(noneProps);
+    expect(modal.asFragment).toMatchSnapshot();
+  });
+
+  it("Tests modal with icon", () => {
+    const modal = setup(invalidIconProps);
+    expect(modal.asFragment).toMatchSnapshot();
+    fireEvent.click(modal.getByTestId("toggle-button"));
+    fireEvent.click(modal.getByTestId("close-button"));
+    expect(invalidIconProps.onClose).toHaveBeenCalledTimes(2);
+  });
+});

src/test/components/searchBar.spec.tsx

@@ -0,0 +1,101 @@
+import { fireEvent, render } from "@testing-library/react";
+import SearchBar, {
+  handleQueryWithProvider,
+  ISearchProviderProps,
+  ISearchBarProps,
+} from "../../components/searchBar";
+
+const providers: Array<ISearchProviderProps> = [
+  {
+    name: "Allmusic",
+    url: "https://www.allmusic.com/search/all/",
+    prefix: "/a",
+  },
+  {
+    name: "Discogs",
+    url: "https://www.discogs.com/search/?q=",
+    prefix: "/di",
+  },
+  {
+    name: "Duck Duck Go",
+    url: "https://duckduckgo.com/?q=",
+    prefix: "/d",
+  },
+];
+
+const setup = () => {
+  const searchBar = render(<SearchBar providers={providers} />);
+  const input = searchBar.getByTestId("search-input");
+  const clearButton = searchBar.getByTestId("search-clear");
+  const submitButton = searchBar.getByTestId("search-submit");
+
+  return {
+    searchBar,
+    input,
+    clearButton,
+    submitButton,
+  };
+};
+
+describe("searchBar.tsx", () => {
+  beforeEach(() => {
+    delete global.window.location;
+    global.window = Object.create(window);
+    global.window.location = {
+      port: "123",
+      protocol: "http:",
+      hostname: "localhost",
+    };
+  });
+
+  it("Tests SearchBar rendering", () => {
+    const { asFragment } = render(<SearchBar providers={providers} />);
+    expect(asFragment).toMatchSnapshot();
+  });
+
+  it("Tests handleQueryWithProvider", () => {
+    providers.forEach((provider: ISearchProviderProps) => {
+      handleQueryWithProvider(providers, provider.prefix + " test");
+      expect(window.location.href).toEqual(provider.url + "test");
+    });
+  });
+
+  it("Tests handleQueryWithProvider default", () => {
+    handleQueryWithProvider(providers, "test");
+    expect(window.location.href).toEqual("https://google.com/search?q=test");
+  });
+
+  it("Tests handleQueryWithProvider without providers", () => {
+    handleQueryWithProvider(undefined, "test");
+    expect(window.location.href).toEqual("https://google.com/search?q=test");
+  });
+
+  it("Tests SearchBar component with default search", () => {
+    const { input, submitButton } = setup();
+    fireEvent.change(input, { target: { value: "test" } });
+    fireEvent.click(submitButton);
+
+    expect(window.location.href).toEqual("https://google.com/search?q=test");
+  });
+
+  it("Tests SearchBar component with other search", () => {
+    const { input, submitButton } = setup();
+
+    fireEvent.change(input, { target: { value: "/a test" } });
+    fireEvent.click(submitButton);
+
+    expect(window.location.href).toEqual(
+      "https://www.allmusic.com/search/all/test",
+    );
+  });
+
+  it("Tests SearchBar component clear", () => {
+    const { input, clearButton, submitButton } = setup();
+
+    fireEvent.change(input, { target: { value: "/a test" } });
+    fireEvent.click(clearButton);
+    fireEvent.click(submitButton);
+
+    expect(window.location.href).toEqual("https://google.com/search?q=");
+  });
+});

src/test/components/settings.spec.tsx

@@ -0,0 +1,143 @@
+import { fireEvent, render } from "@testing-library/react";
+import Settings, {
+  FormContainer,
+  Table,
+  TableRow,
+  TableCell,
+  HeadCell,
+  Section,
+  SectionHeadline,
+  SelectorStyle,
+} from "../../components/settings";
+import { ISearchProviderProps } from "../../components/searchBar";
+import { IThemeProps } from "../../lib/theme";
+
+const themes: Array<IThemeProps> = [
+  {
+    label: "Classic",
+    value: 0,
+    mainColor: "#000000",
+    accentColor: "#1e272e",
+    backgroundColor: "#ffffff",
+  },
+  {
+    label: "Classic",
+    value: 0,
+    mainColor: "#000000",
+    accentColor: "#1e272e",
+    backgroundColor: "#ffffff",
+  },
+];
+
+const providers: Array<ISearchProviderProps> = [
+  {
+    name: "Allmusic",
+    url: "https://www.allmusic.com/search/all/",
+    prefix: "/a",
+  },
+  {
+    name: "Discogs",
+    url: "https://www.discogs.com/search/?q=",
+    prefix: "/di",
+  },
+  {
+    name: "Duck Duck Go",
+    url: "https://duckduckgo.com/?q=",
+    prefix: "/d",
+  },
+];
+
+const propsList = [
+  {
+    themes: themes,
+    providers: providers,
+  },
+  {
+    themes: themes,
+    providers: undefined,
+  },
+  {
+    themes: undefined,
+    providers: providers,
+  },
+  {
+    themes: undefined,
+    providers: undefined,
+  },
+];
+
+describe("settings.tsx", () => {
+  const location: Location = window.location;
+  8;
+
+  beforeEach(() => {
+    // @ts-ignore
+    delete window.location;
+
+    window.location = {
+      ...location,
+      reload: jest.fn(),
+    };
+  });
+
+  it("Tests forms", () => {
+    const { asFragment } = render(<FormContainer />);
+    expect(asFragment).toMatchSnapshot();
+  });
+
+  it("Tests tables", () => {
+    const { asFragment } = render(
+      <Table>
+        <tbody>
+          <TableRow>
+            <HeadCell>Test</HeadCell>
+          </TableRow>
+          <TableRow>
+            <TableCell>Test</TableCell>
+          </TableRow>
+        </tbody>
+      </Table>,
+    );
+
+    expect(asFragment).toMatchSnapshot();
+  });
+
+  it("Tests sections", () => {
+    const { asFragment } = render(
+      <Section>
+        <SectionHeadline>Test</SectionHeadline>
+      </Section>,
+    );
+
+    expect(asFragment).toMatchSnapshot();
+  });
+
+  it("Tests settings rendering", () => {
+    propsList.forEach((props) => {
+      const settings = render(
+        <Settings themes={props.themes} providers={props.providers} />,
+      );
+
+      expect(settings.asFragment).toMatchSnapshot();
+    });
+  });
+
+  // TODO: Finish this test
+  it("Tests theme setting", () => {
+    const settings = render(
+      <Settings
+        themes={propsList[0].themes}
+        providers={propsList[0].providers}
+      />,
+    );
+
+    const toggleButton = settings.getByTestId("toggle-button");
+
+    const submitButton = settings.getByTestId("button-submit");
+    const refreshButton = settings.getByTestId("button-refresh");
+
+    fireEvent.click(toggleButton);
+
+    fireEvent.click(submitButton);
+  });
+});

src/test/lib/fetcher.spec.tsx

@@ -0,0 +1,46 @@
+import { ok } from "assert";
+import useFetcher, {
+  defaults,
+  handleResponse,
+  handleError,
+  fetchProduction,
+  fetchDevelopment,
+} from "../../lib/fetcher";
+
+describe("fetcher.tsx", () => {
+  it("Tests handleResponse", () => {});
+
+  it("Tests handleError", () => {
+    expect(handleError("apps", Error("Test!"))).toEqual({
+      ...defaults.app,
+      error: "Test!",
+    });
+
+    expect(handleError("bookmark", Error("Test!"))).toEqual({
+      ...defaults.bookmark,
+      error: "Test!",
+    });
+
+    expect(handleError("searchProvider", Error("Test!"))).toEqual({
+      ...defaults.search,
+      error: "Test!",
+    });
+
+    expect(handleError("theme", Error("Test!"))).toEqual({
+      ...defaults.theme,
+      error: "Test!",
+    });
+
+    expect(handleError("imprint", Error("Test!"))).toEqual({
+      ...defaults.imprint,
+      error: "Test!",
+    });
+
+    expect(handleError("greeter", Error("Test!"))).toEqual({
+      ...defaults.greeter,
+      error: "Test!",
+    });
+
+    expect(handleError("", Error("Test!"))).toEqual(undefined);
+  });
+});

src/test/lib/theme.spec.tsx

@@ -1,8 +1,4 @@
-import selectedTheme, {
-  getTheme,
-  IThemeProps,
-  setTheme,
-} from "../../lib/theme";
+import { getTheme, IThemeProps, setTheme } from "../../lib/theme";
 
 const props: IThemeProps = {
   label: "Classic",
@@ -12,33 +8,47 @@ const props: IThemeProps = {
   backgroundColor: "#ffffff",
 };
 
-const theme = JSON.stringify(props);
+const location: Location = window.location;
+const setup = () => {
+  Object.defineProperty(window, "localStorage", {
+    value: {
+      getItem: jest.fn(() => JSON.stringify(props)),
+      setItem: jest.fn(() => null),
+    },
+    writable: true,
+  });
+
+  // @ts-ignore
+  delete window.location;
+
+  window.location = {
+    ...location,
+    reload: jest.fn(),
+  };
+};
 
 describe("theme.tsx", () => {
-  beforeEach(() => {
-    Object.defineProperty(window, "localStorage", {
-      value: {
-        getItem: jest.fn(() => null),
-        setItem: jest.fn(() => null),
-      },
-      writable: true,
-    });
-  });
-
   it("setTheme test", () => {
-    setTheme(theme);
+    setup();
 
+    setTheme(props);
     expect(window.localStorage.setItem).toHaveBeenCalledTimes(1);
-    expect(window.localStorage.setItem).toHaveBeenCalledWith("theme", theme);
+    expect(window.localStorage.setItem).toHaveBeenCalledWith(
+      "theme",
+      JSON.stringify(props),
+    );
+    expect(window.location.reload).toHaveBeenCalledTimes(1);
   });
 
-  it("getTheme test", () => {
-    const themeTest = getTheme();
+  it("Tests getTheme", () => {
+    setup();
+
+    let themeTest = getTheme();
     expect(themeTest).toEqual(props);
   });
 
-  it("selectedTheme test", () => {
-    const themeTest = selectedTheme;
-    expect(themeTest).toEqual(props);
+  it("Tests getTheme with empty parameters", () => {
+    localStorage.setItem("theme", "");
+    expect(getTheme()).toEqual({});
   });
 });