diff --git a/src/lib/components/Button/Button.jsx b/src/lib/components/Button/Button.jsx
index 7a3a0085..8b0333a8 100644
--- a/src/lib/components/Button/Button.jsx
+++ b/src/lib/components/Button/Button.jsx
@@ -29,8 +29,13 @@ export const Button = React.forwardRef((props, ref) => {
     color,
     ...restProps
   } = props;
-  const inputGroupContext = useContext(InputGroupContext);
   const buttonGroupContext = useContext(ButtonGroupContext);
+  const inputGroupContext = useContext(InputGroupContext);
+
+  if (buttonGroupContext && inputGroupContext) {
+    throw new Error('Button cannot be placed both in `ButtonGroup` and `InputGroup`.');
+  }
+
   const primaryContext = buttonGroupContext ?? inputGroupContext;
 
   return (
diff --git a/src/lib/components/InputGroup/README.mdx b/src/lib/components/InputGroup/README.mdx
index e5f83aa0..b9c551b9 100644
--- a/src/lib/components/InputGroup/README.mdx
+++ b/src/lib/components/InputGroup/README.mdx
@@ -158,46 +158,71 @@ Validation states visually present the result of validation of the grouped
 inputs. Input group's validation state is taken from its child inputs. You
 should always **provide validation messages for states other than valid**
 directly through `validationTexts` prop so users know what happened and what
-action they should take or what options they have. Validation messages passed
-to input elements' `validationText` prop will be ignored.
+action they should take or what options they have. These messages are not
+semantically tied to the `children` elements, the connection should be expressed
+in textual form in the actual message. The individual `children` elements must
+not show any `validationText`, they only show their respective `validationState`.
+Validation messages passed to input elements' `validationText` prop will be
+ignored.
 
 <Playground>
   <InputGroup
-    label="Password"
+    label="First and last name"
     layout="vertical"
-    validationTexts={["Password must include at least 1 special character."]}
+    validationTexts={[
+      "First name must be filled in.",
+      "Last name must be filled in.",
+    ]}
   >
     <TextField
-      label="Password"
-      type="password"
+      label="First name"
+      placeholder="Eg. John"
+      validationState="invalid"
+      value=""
+    />
+    <TextField
+      label="Last name"
+      placeholder="Eg. Doe"
       validationState="invalid"
-      defaultValue="SecretPassword"
+      value=""
     />
     <Button label="Submit" />
   </InputGroup>
   <InputGroup
-    label="Password"
+    label="First and last name"
     layout="vertical"
-    validationTexts={["Your password is not strong enough."]}
+    validationTexts={[
+      "Last name should not include any digits.",
+    ]}
   >
     <TextField
-      label="Password"
-      type="password"
+      label="First name"
+      placeholder="Eg. John"
+      value="John"
+    />
+    <TextField
+      label="Last name"
+      placeholder="Eg. Doe"
       validationState="warning"
-      defaultValue="Secret."
+      value="123Doe"
     />
     <Button label="Submit" />
   </InputGroup>
   <InputGroup
-    label="Password"
+    label="First and last name"
     layout="vertical"
-    validationTexts={["Your password is strong."]}
   >
     <TextField
-      label="Password"
-      type="password"
+      label="First name"
+      placeholder="Eg. John"
+      validationState="valid"
+      value="John"
+    />
+    <TextField
+      label="Last name"
+      placeholder="Eg. Doe"
       validationState="valid"
-      defaultValue="SecretPassword007!"
+      value="Doe"
     />
     <Button label="Submit" />
   </InputGroup>
diff --git a/src/lib/components/InputGroup/__tests__/InputGroup.test.jsx b/src/lib/components/InputGroup/__tests__/InputGroup.test.jsx
index 4fa62a30..6b64a40b 100644
--- a/src/lib/components/InputGroup/__tests__/InputGroup.test.jsx
+++ b/src/lib/components/InputGroup/__tests__/InputGroup.test.jsx
@@ -7,22 +7,24 @@ import { Button } from '../../Button';
 import { SelectField } from '../../SelectField';
 import { TextField } from '../../TextField';
 import { childrenEmptyPropTest } from '../../../../../tests/propTests/childrenEmptyPropTest';
+import { isLabelVisible } from '../../../../../tests/propTests/isLabelVisible';
+import { layoutPropTest } from '../../../../../tests/propTests/layoutPropTest';
 import { InputGroup } from '../InputGroup';
 
 const mandatoryProps = {
   children: [
-    <TextField key="Text field" label="Text field" />,
+    <TextField key="text field" label="text field" />,
     <SelectField
-      key="Select field"
-      label="Select field"
+      key="select field"
+      label="select field"
       options={[{
-        label: 'label',
-        value: 'value',
+        label: 'option 1',
+        value: 1,
       }]}
     />,
-    <Button key="Button" label="Button" />,
+    <Button key="button" label="button" />,
   ],
-  label: 'Input group label',
+  label: 'label',
 };
 
 describe('rendering', () => {
@@ -31,48 +33,49 @@ describe('rendering', () => {
     [
       {},
       (rootElement) => {
-        expect(within(rootElement).getByText('Input group label'));
-        expect(within(rootElement).getByText('Text field'));
-        expect(within(rootElement).getByText('Select field'));
-        expect(within(rootElement).getByText('Button'));
+        expect(within(rootElement).getByText('text field'));
+        expect(within(rootElement).getByText('select field'));
+        expect(within(rootElement).getByText('button'));
       },
     ],
-    [
-      { isLabelVisible: false },
-      (rootElement) => expect(within(rootElement).getByText('Input group label')).toHaveClass('isLabelHidden'),
-    ],
-    [
-      {},
-      (rootElement) => expect(within(rootElement).getByText('Input group label').closest('label')).toHaveClass('isRootLayoutHorizontal'),
-    ],
-    [
-      { layout: 'vertical' },
-      (rootElement) => expect(within(rootElement).getByText('Input group label').closest('label')).toHaveClass('isRootLayoutVertical'),
-    ],
+    ...isLabelVisible,
+    ...layoutPropTest,
     [
       { size: 'small' },
       (rootElement) => {
-        expect(within(rootElement).getByText('Text field').closest('label')).toHaveClass('isRootSizeSmall');
-        expect(within(rootElement).getByText('Select field').closest('label')).toHaveClass('isRootSizeSmall');
+        expect(within(rootElement).getByText('text field').closest('label')).toHaveClass('isRootSizeSmall');
+        expect(within(rootElement).getByText('select field').closest('label')).toHaveClass('isRootSizeSmall');
         expect(within(rootElement).getByRole('button')).toHaveClass('isRootSizeSmall');
       },
     ],
     [
       { size: 'medium' },
       (rootElement) => {
-        expect(within(rootElement).getByText('Text field').closest('label')).toHaveClass('isRootSizeMedium');
-        expect(within(rootElement).getByText('Select field').closest('label')).toHaveClass('isRootSizeMedium');
+        expect(within(rootElement).getByText('text field').closest('label')).toHaveClass('isRootSizeMedium');
+        expect(within(rootElement).getByText('select field').closest('label')).toHaveClass('isRootSizeMedium');
         expect(within(rootElement).getByRole('button')).toHaveClass('isRootSizeMedium');
       },
     ],
     [
       { size: 'large' },
       (rootElement) => {
-        expect(within(rootElement).getByText('Text field').closest('label')).toHaveClass('isRootSizeLarge');
-        expect(within(rootElement).getByText('Select field').closest('label')).toHaveClass('isRootSizeLarge');
+        expect(within(rootElement).getByText('text field').closest('label')).toHaveClass('isRootSizeLarge');
+        expect(within(rootElement).getByText('select field').closest('label')).toHaveClass('isRootSizeLarge');
         expect(within(rootElement).getByRole('button')).toHaveClass('isRootSizeLarge');
       },
     ],
+    [
+      {
+        validationTexts: [
+          'validation text 1',
+          'validation text 2',
+        ],
+      },
+      (rootElement) => {
+        expect(within(rootElement).getByText('validation text 1'));
+        expect(within(rootElement).getByText('validation text 2'));
+      },
+    ],
   ])('renders with props: "%s"', (testedProps, assert) => {
     const dom = render((
       <InputGroup