diff --git a/packages/blocks/src/store/test/reducer.js b/packages/blocks/src/store/test/reducer.js
index 5664f9d876cb6..7c5dcbf861fc6 100644
--- a/packages/blocks/src/store/test/reducer.js
+++ b/packages/blocks/src/store/test/reducer.js
@@ -108,12 +108,12 @@ describe( 'blockStyles', () => {
 		expect( blockStyles( undefined, {} ) ).toEqual( {} );
 	} );
 
-	it( 'should add a new block styles', () => {
+	it( 'should add new block styles for a single block type', () => {
 		const original = deepFreeze( {} );
 
 		let state = blockStyles( original, {
 			type: 'ADD_BLOCK_STYLES',
-			blockName,
+			blockNames: [ blockName ],
 			styles: [ { name: 'fancy' } ],
 		} );
 
@@ -123,7 +123,7 @@ describe( 'blockStyles', () => {
 
 		state = blockStyles( state, {
 			type: 'ADD_BLOCK_STYLES',
-			blockName,
+			blockNames: [ blockName ],
 			styles: [ { name: 'lightbox' } ],
 		} );
 
@@ -132,6 +132,32 @@ describe( 'blockStyles', () => {
 		} );
 	} );
 
+	it( 'should add block styles for array of block types', () => {
+		const original = deepFreeze( {} );
+
+		let state = blockStyles( original, {
+			type: 'ADD_BLOCK_STYLES',
+			blockNames: [ 'core/group', 'core/columns' ],
+			styles: [ { name: 'dark' } ],
+		} );
+
+		expect( state ).toEqual( {
+			'core/group': [ { name: 'dark' } ],
+			'core/columns': [ { name: 'dark' } ],
+		} );
+
+		state = blockStyles( state, {
+			type: 'ADD_BLOCK_STYLES',
+			blockNames: [ 'core/group' ],
+			styles: [ { name: 'light' } ],
+		} );
+
+		expect( state ).toEqual( {
+			'core/group': [ { name: 'dark' }, { name: 'light' } ],
+			'core/columns': [ { name: 'dark' } ],
+		} );
+	} );
+
 	it( 'should prepend block styles when adding a block', () => {
 		const original = deepFreeze( {
 			[ blockName ]: [ { name: 'fancy' } ],