added various unit tests

src/components/copy/__snapshots__/copy.test.tsx.snap

@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`EuiCopy is rendered 1`] = `
+<EuiToolTip
+  delay="regular"
+  onMouseOut={[Function]}
+  position="top"
+>
+  <button
+    onClick={[Function]}
+  >
+    Click to copy input text
+  </button>
+</EuiToolTip>
+`;

src/components/copy/copy.test.tsx

@@ -0,0 +1,23 @@
+import React from 'react';
+import { shallow } from 'enzyme';
+import { EuiCopy } from './copy';
+
+describe('EuiCopy', () => {
+  test('is rendered', () => {
+    const component = shallow(
+      <EuiCopy textToCopy="some text">
+        {copy => <button onClick={copy}>Click to copy input text</button>}
+      </EuiCopy>
+    );
+    expect(component).toMatchSnapshot();
+  });
+
+  test('beforeMessage', () => {
+    const component = shallow(
+      <EuiCopy textToCopy="some text" beforeMessage="copy this">
+        {copy => <button onClick={copy}>Click to copy input text</button>}
+      </EuiCopy>
+    );
+    expect(component.state('tooltipText')).toBe('copy this');
+  });
+});

src/components/date_picker/super_date_picker/date_modes.test.js

@@ -0,0 +1,30 @@
+import { getDateMode, toAbsoluteString, toRelativeString } from './date_modes';
+
+jest.mock('@elastic/datemath', () => ({
+  parse: () => ({ toISOString: () => 'gsoc' }),
+}));
+
+jest.mock('./relative_utils', () => ({
+  parseRelativeParts: () => 'in eui',
+  toRelativeStringFromParts: () => 'now',
+}));
+
+describe('dateMode', () => {
+  test('date mode', () => {
+    expect(getDateMode('now')).toBe('now');
+    expect(getDateMode('acknowledge')).toBe('relative');
+    expect(getDateMode('eui')).toBe('absolute');
+  });
+
+  test('absolute string', () => {
+    expect(toAbsoluteString('now&1d', true)).toBe('gsoc');
+    expect(toAbsoluteString('now/0.5y', false)).toBe('gsoc');
+    expect(toAbsoluteString('now-1w/w')).toBe('gsoc');
+  });
+
+  test('relative string', () => {
+    expect(toRelativeString('now&1d')).toBe('now');
+    expect(toRelativeString('now/0.5y')).toBe('now');
+    expect(toRelativeString('now-1w/w')).toBe('now');
+  });
+});

src/components/tabs/tab.test.tsx

@@ -44,5 +44,13 @@ describe('EuiTab', () => {
         expect(onClickHandler).toBeCalled();
       });
     });
+
+    describe('href', () => {
+      test('has href assigned to it', () => {
+        const component = render(<EuiTab href="/test">Click Me</EuiTab>);
+
+        expect(component[0].attribs.href).toBe('/test');
+      });
+    });
   });
 });

src/components/text/__snapshots__/text_align.test.tsx.snap

@@ -1,5 +1,29 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`EuiTextAlign in center direction 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiTextAlign euiTextAlign--center testClass1 testClass2"
+  data-test-subj="test subject string"
+/>
+`;
+
+exports[`EuiTextAlign in left direction 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiTextAlign euiTextAlign--left testClass1 testClass2"
+  data-test-subj="test subject string"
+/>
+`;
+
+exports[`EuiTextAlign in right direction 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiTextAlign euiTextAlign--right testClass1 testClass2"
+  data-test-subj="test subject string"
+/>
+`;
+
 exports[`EuiTextAlign is rendered 1`] = `
 <div
   aria-label="aria-label"

src/components/text/text_align.test.tsx

@@ -2,12 +2,25 @@ import React from 'react';
 import { render } from 'enzyme';
 import { requiredProps } from '../../test';
 
-import { EuiTextAlign } from './text_align';
+import { EuiTextAlign, TextAlignment } from './text_align';
 
 describe('EuiTextAlign', () => {
   test('is rendered', () => {
     const component = render(<EuiTextAlign {...requiredProps} />);
 
     expect(component).toMatchSnapshot();
   });
+
+  ['left', 'right', 'center'].forEach(direction => {
+    test(`in ${direction} direction`, () => {
+      const component = render(
+        <EuiTextAlign
+          {...requiredProps}
+          textAlign={direction as TextAlignment}
+        />
+      );
+
+      expect(component).toMatchSnapshot();
+    });
+  });
 });

src/components/toggle/__snapshots__/toggle.test.tsx.snap

@@ -13,3 +13,47 @@ exports[`EuiToggle is rendered 1`] = `
   />
 </div>
 `;
+
+exports[`EuiToggle props is checked 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiToggle euiToggle--checked testClass1 testClass2"
+>
+  <input
+    aria-label="Is toggle on?"
+    checked=""
+    class="euiToggle__input"
+    data-test-subj="test subject string"
+    type="checkbox"
+  />
+</div>
+`;
+
+exports[`EuiToggle props is disabled 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiToggle testClass1 testClass2"
+>
+  <input
+    aria-label="Is toggle on?"
+    class="euiToggle__input"
+    data-test-subj="test subject string"
+    disabled=""
+    type="checkbox"
+  />
+</div>
+`;
+
+exports[`EuiToggle props is rendered with onChange provided 1`] = `
+<div
+  aria-label="aria-label"
+  class="euiToggle testClass1 testClass2"
+>
+  <input
+    aria-label="Is toggle on?"
+    class="euiToggle__input"
+    data-test-subj="test subject string"
+    type="checkbox"
+  />
+</div>
+`;

src/components/toggle/toggle.test.tsx

@@ -12,4 +12,39 @@ describe('EuiToggle', () => {
 
     expect(component).toMatchSnapshot();
   });
+
+  describe('props', () => {
+    test('is disabled', () => {
+      const component = render(
+        <EuiToggle label="Is toggle on?" isDisabled {...requiredProps} />
+      );
+
+      expect(component).toMatchSnapshot();
+    });
+
+    test('is rendered with onChange provided', () => {
+      const component = render(
+        <EuiToggle
+          label="Is toggle on?"
+          onChange={jest.fn()}
+          {...requiredProps}
+        />
+      );
+
+      expect(component).toMatchSnapshot();
+    });
+
+    test('is checked', () => {
+      const component = render(
+        <EuiToggle
+          label="Is toggle on?"
+          checked
+          onChange={jest.fn()}
+          {...requiredProps}
+        />
+      );
+
+      expect(component).toMatchSnapshot();
+    });
+  });
 });