Add tests for isLoadable

Author: fboeller

projects/ngx-loadable/src/lib/loadable.functions.spec.ts

@@ -0,0 +1,29 @@
+import { errored, idle, loaded, loading } from './loadable.constructors';
+import { isLoadable } from './loadable.functions';
+import { Loadable } from './loadable.type';
+
+describe('isLoadable', () => {
+  it.each([[idle], [loading], [loaded('value')], [errored('error')]])(
+    'returns true for %s',
+    (loadable: Loadable<unknown>) => {
+      expect(isLoadable(loadable)).toBeTruthy();
+    }
+  );
+
+  it.each([
+    [[]],
+    [{}],
+    [undefined],
+    [null],
+    [0],
+    [''],
+    ['value'],
+    [{ type: undefined }],
+    [{ type: null }],
+    [{ type: 'load' }],
+    [{ value: 'value' }],
+    [{ error: 'error' }],
+  ])('returns false for %s', (object: unknown) => {
+    expect(isLoadable(object)).toBeFalsy();
+  });
+});