Add test for fromObservable

package.json

@@ -67,6 +67,7 @@
     "codelyzer": "^6.0.0",
     "husky": "^4.3.0",
     "jest": "^26.6.3",
+    "jest-marbles": "^2.5.1",
     "ng-packagr": "^11.1.2",
     "ngx-build-plus": "^11.0.0",
     "prettier": "^2.1.2",

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

@@ -1,5 +1,6 @@
-import { fromPromise } from './from.functions';
-import { errored, loaded } from './loadable.constructors';
+import { fromObservable, fromPromise } from './from.functions';
+import { errored, loaded, loading } from './loadable.constructors';
+import { cold } from 'jest-marbles';
 
 describe('the creation from a promise', () => {
   it('returns a loaded result if the promise resolves', async () => {
@@ -14,3 +15,17 @@ describe('the creation from a promise', () => {
     );
   });
 });
+
+describe('the creation from an observable', () => {
+  it('returns first a loading state and then the loaded result if the observable does not error', () => {
+    expect(fromObservable(cold('(x|)', { x: 'value' }))).toBeObservable(
+      cold('(ab|)', { a: loading, b: loaded('value') })
+    );
+  });
+
+  it('returns first a loading state and then an error if the observable errors', () => {
+    expect(fromObservable(cold('#', {}, 'error'))).toBeObservable(
+      cold('(ab|)', { a: loading, b: errored('error') })
+    );
+  });
+});