diff --git a/src/test/components/__snapshots__/greeter.spec.tsx.snap b/src/test/components/__snapshots__/greeter.spec.tsx.snap
index 7e0c23b..09f6c9f 100644
--- a/src/test/components/__snapshots__/greeter.spec.tsx.snap
+++ b/src/test/components/__snapshots__/greeter.spec.tsx.snap
@@ -1,3 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Greeter snapshot test 1`] = `[Function]`;
+exports[`Greeter snapshot test with properties 1`] = `[Function]`;
+
+exports[`Greeter snapshot test without properties 1`] = `[Function]`;
diff --git a/src/test/components/__snapshots__/searchBar.spec.tsx.snap b/src/test/components/__snapshots__/searchBar.spec.tsx.snap
index 8003134..0203d30 100644
--- a/src/test/components/__snapshots__/searchBar.spec.tsx.snap
+++ b/src/test/components/__snapshots__/searchBar.spec.tsx.snap
@@ -1,3 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`searchBar.tsx Tests SearchBar rendering 1`] = `[Function]`;
+exports[`searchBar.tsx Tests SearchBar rendering with properties 1`] = `[Function]`;
+
+exports[`searchBar.tsx Tests searchBar rendering without properties 1`] = `[Function]`;
diff --git a/src/test/components/greeter.spec.tsx b/src/test/components/greeter.spec.tsx
index f9d04ab..a2adcfe 100644
--- a/src/test/components/greeter.spec.tsx
+++ b/src/test/components/greeter.spec.tsx
@@ -98,7 +98,12 @@ it("getExtension test", () => {
   expect(getExtension(31)).toEqual("st");
 });
 
-it("Greeter snapshot test", () => {
-  const { asFragment } = render(<Greeter data={props} />);
+it("Greeter snapshot test with properties", () => {
+  const { asFragment } = render(<Greeter greeter={{ greeter: props }} />);
+  expect(asFragment).toMatchSnapshot();
+});
+
+it("Greeter snapshot test without properties", () => {
+  const { asFragment } = render(<Greeter />);
   expect(asFragment).toMatchSnapshot();
 });
diff --git a/src/test/components/searchBar.spec.tsx b/src/test/components/searchBar.spec.tsx
index 6e7c132..3930ac8 100644
--- a/src/test/components/searchBar.spec.tsx
+++ b/src/test/components/searchBar.spec.tsx
@@ -54,11 +54,16 @@ describe("searchBar.tsx", () => {
     };
   });
 
-  it("Tests SearchBar rendering", () => {
+  it("Tests SearchBar rendering with properties", () => {
     const { asFragment } = render(<SearchBar search={props} />);
     expect(asFragment).toMatchSnapshot();
   });
 
+  it("Tests searchBar rendering without properties", () => {
+    const { asFragment } = render(<SearchBar />);
+    expect(asFragment).toMatchSnapshot();
+  });
+
   it("Tests handleQueryWithProvider", () => {
     props.providers?.forEach((provider: ISearchProviderProps) => {
       handleQueryWithProvider(props, provider.prefix + " test");
diff --git a/src/test/components/settings.spec.tsx b/src/test/components/settings.spec.tsx
index 57ea099..77b122c 100644
--- a/src/test/components/settings.spec.tsx
+++ b/src/test/components/settings.spec.tsx
@@ -9,24 +9,26 @@ import Settings, {
   SectionHeadline,
 } from "../../components/settings";
 import { ISearchProps } from "../../components/searchBar";
-import { IThemeProps } from "../../lib/useTheme";
+import { IThemeDataProps } from "../../lib/useTheme";
 
-const themes: Array<IThemeProps> = [
-  {
-    label: "Classic",
-    value: 0,
-    mainColor: "#000000",
-    accentColor: "#1e272e",
-    backgroundColor: "#ffffff",
-  },
-  {
-    label: "Classic",
-    value: 1,
-    mainColor: "#000000",
-    accentColor: "#1e272e",
-    backgroundColor: "#ffffff",
-  },
-];
+const themes: IThemeDataProps = {
+  themes: [
+    {
+      label: "Classic",
+      value: 0,
+      mainColor: "#000000",
+      accentColor: "#1e272e",
+      backgroundColor: "#ffffff",
+    },
+    {
+      label: "Classic",
+      value: 1,
+      mainColor: "#000000",
+      accentColor: "#1e272e",
+      backgroundColor: "#ffffff",
+    },
+  ],
+};
 
 const search: ISearchProps = {
   defaultProvider: "https://test.com?q=",
diff --git a/src/test/lib/useTheme.spec.tsx b/src/test/lib/useTheme.spec.tsx
new file mode 100644
index 0000000..250dea4
--- /dev/null
+++ b/src/test/lib/useTheme.spec.tsx
@@ -0,0 +1,76 @@
+import { getTheme, IThemeProps, setScheme, setTheme } from "../../lib/useTheme";
+
+const props: IThemeProps = {
+  label: "Classic",
+  value: 0,
+  mainColor: "#000000",
+  accentColor: "#1e272e",
+  backgroundColor: "#ffffff",
+};
+
+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", () => {
+  it("Tests setScheme", () => {
+    setup();
+
+    let value = "dark";
+
+    setScheme(value);
+    expect(window.localStorage.setItem).toHaveBeenCalledTimes(1);
+    expect(window.localStorage.setItem).toHaveBeenCalledWith("theme", value);
+  });
+
+  it("setTheme light test", () => {
+    setup();
+
+    setTheme("light", props);
+    expect(window.localStorage.setItem).toHaveBeenCalledTimes(2);
+    expect(window.localStorage.setItem).toHaveBeenCalledWith(
+      "light-theme",
+      JSON.stringify(props),
+    );
+    expect(window.location.reload).toHaveBeenCalledTimes(1);
+  });
+
+  it("setTheme dark test", () => {
+    setup();
+
+    setTheme("dark", props);
+    expect(window.localStorage.setItem).toHaveBeenCalledTimes(2);
+    expect(window.localStorage.setItem).toHaveBeenCalledWith(
+      "dark-theme",
+      JSON.stringify(props),
+    );
+    expect(window.location.reload).toHaveBeenCalledTimes(1);
+  });
+
+  it("Tests getTheme", () => {
+    setup();
+
+    let themeTest = getTheme();
+    expect(themeTest).toEqual(props);
+  });
+
+  it("Tests getTheme with empty parameters", () => {
+    localStorage.setItem("theme", "");
+    expect(getTheme()).toEqual({});
+  });
+});