Add test for when gutenberg isn't the only plugin for validation error

assets/src/components/site-scan-context-provider/get-slugs-from-validation-results.js

@@ -35,7 +35,6 @@ export function getSlugsFromValidationResults( validationResults = [] ) {
 	// Skip including AMP in the summary, since AMP is like core.
 	plugins.delete( 'amp' );
 
-
 	return {
 		plugins: [ ...plugins ],
 		themes: [ ...themes ],

assets/src/components/site-scan-context-provider/test/get-slugs-from-validation-results.js

@@ -62,7 +62,7 @@ describe( 'getSlugsFromValidationResults', () => {
 		expect( slugs.themes ).toStrictEqual( [ 'twentytwenty' ] );
 	} );
 
-	it( 'returns Gutenberg if it is the only plugin in the list', () => {
+	it( 'returns Gutenberg if it is the only plugin for a single validation error', () => {
 		const validationResult = [
 			{
 				sources: [
@@ -82,4 +82,19 @@ describe( 'getSlugsFromValidationResults', () => {
 		expect( slugs.plugins ).toStrictEqual( [ 'gutenberg' ] );
 		expect( slugs.themes ).toStrictEqual( [ 'twentytwenty' ] );
 	} );
+
+	it( 'does not return Gutenberg if there are other plugins for the same validation error', () => {
+		const validationResult = [
+			{
+				sources: [
+					{ type: 'plugin', name: 'gutenberg' },
+					{ type: 'plugin', name: 'jetpack' },
+				],
+			},
+		];
+
+		const slugs = getSlugsFromValidationResults( validationResult );
+
+		expect( slugs.plugins ).toStrictEqual( [ 'jetpack' ] );
+	} );
 } );