diff --git a/packages/keycodes/src/test/index.js b/packages/keycodes/src/test/index.js
index 2d7d83249ec574..87fdb10ac81165 100644
--- a/packages/keycodes/src/test/index.js
+++ b/packages/keycodes/src/test/index.js
@@ -7,6 +7,7 @@ import {
 	rawShortcut,
 	shortcutAriaLabel,
 	isKeyboardEvent,
+	isKeyboardModifierEvent,
 } from '../';
 
 const isAppleOSFalse = () => false;
@@ -474,3 +475,246 @@ describe( 'isKeyboardEvent', () => {
 		} );
 	} );
 } );
+
+describe( 'isKeyboardModifierEvent', () => {
+	afterEach( () => {
+		while ( document.body.firstChild ) {
+			document.body.removeChild( document.body.firstChild );
+		}
+	} );
+
+	function keyPress( target, modifiers = {} ) {
+		[ 'keydown', 'keypress', 'keyup' ].forEach( ( eventName ) => {
+			const event = new window.Event( eventName, { bubbles: true } );
+			Object.assign( event, modifiers );
+			target.dispatchEvent( event );
+		} );
+	}
+
+	function attachEventListeners( eventHandler ) {
+		const attachNode = document.createElement( 'div' );
+		document.body.appendChild( attachNode );
+
+		[ 'keydown', 'keypress', 'keyup' ].forEach( ( eventName ) => {
+			attachNode.addEventListener( eventName, eventHandler );
+		} );
+
+		return attachNode;
+	}
+
+	describe( 'primary', () => {
+		it( 'should identify modifier key when Ctrl is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				key: 'Ctrl',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⌘ is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				key: 'Meta',
+			} );
+		} );
+
+		it( 'should identify modifier key when Ctrl + M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				key: 'm',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⌘M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				key: 'm',
+			} );
+		} );
+	} );
+
+	describe( 'primaryShift', () => {
+		it( 'should identify modifier key when Shift + Ctrl is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				shiftKey: true,
+				key: 'Ctrl',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⇧⌘ is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				shiftKey: true,
+				key: 'Meta',
+			} );
+		} );
+
+		it( 'should identify modifier key when Shift + Ctrl + M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				shiftKey: true,
+				key: 'm',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⇧⌘M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				shiftKey: true,
+				key: 'm',
+			} );
+		} );
+	} );
+
+	describe( 'secondary', () => {
+		it( 'should identify modifier key when Shift + Alt + Ctrl is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				shiftKey: true,
+				altKey: true,
+				key: 'Ctrl',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⇧⌥⌘ is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				shiftKey: true,
+				altKey: true,
+				key: 'Meta',
+			} );
+		} );
+
+		it( 'should identify modifier key when Shift + Ctrl + ALt + M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				shiftKey: true,
+				altKey: true,
+				key: 'm',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⇧⌥⌘M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				shiftKey: true,
+				altKey: true,
+				key: 'm',
+			} );
+		} );
+	} );
+
+	describe( 'access', () => {
+		it( 'should identify modifier key when Alt + Ctrl is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				altKey: true,
+				key: 'Ctrl',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⌥⌘ is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				altKey: true,
+				key: 'Meta',
+			} );
+		} );
+
+		it( 'should identify modifier key when Ctrl + ALt + M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSFalse ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				ctrlKey: true,
+				altKey: true,
+				key: 'm',
+			} );
+		} );
+
+		it( 'should identify modifier key when ⌥⌘M is pressed', () => {
+			expect.assertions( 3 );
+			const attachNode = attachEventListeners( ( event ) => {
+				expect( isKeyboardModifierEvent.primary( event, isAppleOSTrue ) ).toBe( true );
+			} );
+
+			keyPress( attachNode, {
+				metaKey: true,
+				altKey: true,
+				key: 'm',
+			} );
+		} );
+	} );
+} );