Add a checkSelection selector module and expose a getHostCheckSelecti…

…on selector

assets/js/state/selectors/checksSelection.js

@@ -0,0 +1,6 @@
+import { TARGET_HOST } from '@lib/model';
+
+export const getHostCheckSelection =
+  (hostID) =>
+  ({ checksSelection }) =>
+    checksSelection?.[TARGET_HOST][hostID] || {};

assets/js/state/selectors/checksSelection.test.js

@@ -0,0 +1,32 @@
+import { faker } from '@faker-js/faker';
+import { getHostCheckSelection } from './checksSelection';
+
+describe('Checks Selection selector', () => {
+  it(`should get a host's check selection state`, () => {
+    const hostID = faker.datatype.uuid();
+    expect(
+      getHostCheckSelection(hostID)({
+        checksSelection: {
+          host: {
+            [faker.datatype.uuid()]: { status: 'successfully_saved' },
+            [hostID]: { status: 'saving' },
+          },
+        },
+      })
+    ).toEqual({ status: 'saving' });
+  });
+
+  it(`should not get a host's check selection state if not present`, () => {
+    const hostWithoutSelection = faker.datatype.uuid();
+    expect(
+      getHostCheckSelection(hostWithoutSelection)({
+        checksSelection: {
+          host: {
+            [faker.datatype.uuid()]: { status: 'successfully_saved' },
+            [faker.datatype.uuid()]: { status: 'saving' },
+          },
+        },
+      })
+    ).toEqual({});
+  });
+});