Carry over relevant Preferenes tests from edit-post package

packages/edit-site/src/store/test/actions.js

@@ -0,0 +1,16 @@
+/**
+ * Internal dependencies
+ */
+import { toggleFeature } from '../actions';
+
+describe( 'actions', () => {
+	describe( 'toggleFeature', () => {
+		it( 'should return TOGGLE_FEATURE action', () => {
+			const feature = 'name';
+			expect( toggleFeature( feature ) ).toEqual( {
+				type: 'TOGGLE_FEATURE',
+				feature,
+			} );
+		} );
+	} );
+} );

packages/edit-site/src/store/test/reducer.js

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+/**
+ * External dependencies
+ */
+import deepFreeze from 'deep-freeze';
+
+/**
+ * Internal dependencies
+ */
+import { preferences } from '../reducer';
+import { PREFERENCES_DEFAULTS } from '../defaults';
+
+describe( 'state', () => {
+	describe( 'preferences()', () => {
+		it( 'should apply all defaults', () => {
+			const state = preferences( undefined, {} );
+
+			expect( state ).toEqual( PREFERENCES_DEFAULTS );
+		} );
+
+		it( 'should toggle a feature flag', () => {
+			const state = preferences(
+				deepFreeze( { features: { chicken: true } } ),
+				{
+					type: 'TOGGLE_FEATURE',
+					feature: 'chicken',
+				}
+			);
+
+			expect( state.features ).toEqual( { chicken: false } );
+		} );
+	} );
+} );

packages/edit-site/src/store/test/selectors.js

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+/**
+ * Internal dependencies
+ */
+import { isFeatureActive } from '../selectors';
+
+describe( 'selectors', () => {
+	describe( 'isFeatureActive', () => {
+		it( 'is tolerant to an undefined features preference', () => {
+			// See: https://github.com/WordPress/gutenberg/issues/14580
+			const state = {
+				preferences: {},
+			};
+
+			expect( isFeatureActive( state, 'chicken' ) ).toBe( false );
+		} );
+
+		it( 'should return true if feature is active', () => {
+			const state = {
+				preferences: {
+					features: {
+						chicken: true,
+					},
+				},
+			};
+
+			expect( isFeatureActive( state, 'chicken' ) ).toBe( true );
+		} );
+
+		it( 'should return false if feature is not active', () => {
+			const state = {
+				preferences: {
+					features: {
+						chicken: false,
+					},
+				},
+			};
+
+			expect( isFeatureActive( state, 'chicken' ) ).toBe( false );
+		} );
+
+		it( 'should return false if feature is not referred', () => {
+			const state = {
+				preferences: {
+					features: {},
+				},
+			};
+
+			expect( isFeatureActive( state, 'chicken' ) ).toBe( false );
+		} );
+	} );
+} );