feat(utils): add utils library with a fake ramdon generator

libs/shared/utils/src/index.ts

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+export * from './lib/random-http-error.utils';

libs/shared/utils/src/lib/random-http-error.utils.ts

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+import { randNumber } from '@ngneat/falso';
+
+/**
+ * Execute success function if value is above threshold and error function otherwise
+ * Success and error function should return the same ReturnType
+ * @param success
+ * @param error
+ * @param threashold default to 0.5
+ */
+export const randomError = <T>({
+  success,
+  error,
+  threashold,
+}: {
+  success: () => T;
+  error: () => T;
+  threashold?: number;
+}): T => {
+  const randomNumber = randNumber({ min: 0.1, max: 1, fraction: 2 });
+  if (randomNumber > (threashold ?? 0.5)) {
+    return success();
+  }
+  return error();
+};

libs/shared/utils/src/test-setup.ts

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+import 'jest-preset-angular/setup-jest';