test: improve animal tests

test/animal.spec.ts

@@ -1,11 +1,116 @@
-import { describe, expect, it } from 'vitest';
+import { afterEach, describe, expect, it } from 'vitest';
 import { faker } from '../dist/cjs';
 
+const seededRuns = [
+  {
+    seed: 42,
+    expectations: {
+      bear: 'Sun bear',
+      bird: 'Iceland Gull',
+      cat: 'Himalayan',
+      cetacean: 'Pantropical Spotted Dolphin',
+      cow: 'Fleckvieh',
+      crocodilia: 'African Slender-snouted Crocodile',
+      dog: 'Garafian Shepherd',
+      fish: 'Northern snakehead',
+      horse: 'Furioso-North Star',
+      insect: 'Gouty oak gall',
+      lion: 'West African Lion',
+      rabbit: 'English Spot',
+      snake: 'Grey-banded kingsnake',
+      type: 'lion',
+    },
+  },
+  {
+    seed: 1337,
+    expectations: {
+      bear: 'Sun bear',
+      bird: 'American Golden-Plover',
+      cat: 'Devon Rex',
+      cetacean: 'Costero',
+      cow: 'Canchim',
+      crocodilia: 'Cuvier’s Dwarf Caiman',
+      dog: 'Chinese Crested Dog',
+      fish: 'Jumbo flying squid',
+      horse: 'Colorado Ranger',
+      insect: 'Eulophid wasp',
+      lion: 'Barbary Lion',
+      rabbit: 'Cinnamon',
+      snake: 'Fierce snake',
+      type: 'bear',
+    },
+  },
+  {
+    seed: 1211,
+    expectations: {
+      bear: 'Polar bear',
+      bird: 'Reed Bunting',
+      cat: 'Tonkinese',
+      cetacean: 'La Plata Dolphin',
+      cow: 'Breed',
+      crocodilia: 'Gharial',
+      dog: 'Tibetan Spaniel',
+      fish: 'Bigeye scad',
+      horse: 'Ukrainian Riding Horse',
+      insect: 'Western paper wasp',
+      lion: 'Cape lion',
+      rabbit: 'Silver Marten',
+      snake: 'Tiger pit viper',
+      type: 'horse',
+    },
+  },
+];
+
+const NON_SEEDED_BASED_RUN = 5;
+
+const functionNames = [
+  'bear',
+  'bird',
+  'cat',
+  'cetacean',
+  'cow',
+  'crocodilia',
+  'dog',
+  'fish',
+  'horse',
+  'insect',
+  'lion',
+  'rabbit',
+  'snake',
+  'type',
+];
+
 describe('animal', () => {
-  describe('dog()', () => {
-    it('returns random value from dog array', () => {
-      const dog = faker.animal.dog();
-      expect(faker.definitions.animal.dog).toContain(dog);
+  afterEach(() => {
+    faker.locale = 'en';
+  });
+
+  for (let { seed, expectations } of seededRuns) {
+    describe(`seed: ${seed}`, () => {
+      for (const functionName of functionNames) {
+        it(`${functionName}()`, () => {
+          faker.seed(seed);
+
+          const actual = faker.animal[functionName]();
+          expect(actual).toEqual(expectations[functionName]);
+        });
+      }
     });
+  }
+
+  // Create and log-back the seed for debug purposes
+  faker.seed(Math.ceil(Math.random() * 1_000_000_000));
+
+  describe(`random seeded tests for seed ${faker.seedValue}`, () => {
+    for (let i = 1; i <= NON_SEEDED_BASED_RUN; i++) {
+      for (const functionName of functionNames) {
+        describe(`${functionName}()`, () => {
+          it(`should return random value from ${functionName} array`, () => {
+            const actual = faker.animal[functionName]();
+            expect(faker.definitions.animal[functionName]).toContain(actual);
+          });
+        });
+      }
+    }
   });
 });