fix: Header Component - Replaced class by func. comp (#142)

* refactor: replaced class by func.comp

* refactor: replacing jest test by react-testing-library

* refactor: added test todos

* feat: added more unit tests

* fix: fixed tooltip import

* fix: fixed test

* fix: fixed typo

* fix: fixed imports

src/components/Header/HeaderLeft.tsx

@@ -0,0 +1,32 @@
+import React from 'react';
+import { css } from 'emotion';
+import { Link } from 'react-router-dom';
+
+import Search from '../Search/';
+
+import HeaderLogo from './HeaderLogo';
+import { LeftSide, SearchWrapper } from './styles';
+
+interface Props {
+  withoutSearch?: boolean;
+  logo?: string;
+}
+
+const HeaderLeft: React.FC<Props> = ({ withoutSearch = false, logo }) => (
+  <LeftSide>
+    <Link
+      className={css`
+        margin-right: 1em;
+      `}
+      to={'/'}>
+      <HeaderLogo logo={logo} />
+    </Link>
+    {!withoutSearch && (
+      <SearchWrapper>
+        <Search />
+      </SearchWrapper>
+    )}
+  </LeftSide>
+);
+
+export default HeaderLeft;