tests(every): add tests for every function

tests/every.test.js

@@ -0,0 +1,69 @@
+import every from '../src/every';
+
+describe('every', () => {
+  test('should return false if the object specified isn\'t an object', () => {
+    const equal = every('test', () => {});
+
+    expect(equal).toBe(false);
+  });
+
+  test('should return false if the object specified is empty', () => {
+    const equal = every({}, () => {});
+
+    expect(equal).toBe(false);
+  });
+
+  test('should return false if the iterator isn\'t provided', () => {
+    const equal = every({});
+
+    expect(equal).toBe(false);
+  });
+
+  test('should return false if the iterator isn\'t a function', () => {
+    const equal = every({}, 'test');
+
+    expect(equal).toBe(false);
+  });
+
+  test('should return true if all values evaluate to true', () => {
+    const equal = every({ a: 1, b: 1, c: 1 }, (key, value) => value === 1);
+
+    expect(equal).toBe(true);
+  });
+
+  test('should return false if one or more values evaluate to false', () => {
+    const equal = every({ a: 1, b: 1, c: 2 }, (key, value) => value === 1);
+
+    expect(equal).toBe(false);
+  });
+
+  test('should return true if all values including deep object values evaluate to true when follow is true', () => {
+    const obj = {
+      a: 1,
+      b: 1,
+      c: 1,
+      d: {
+        e: 1,
+      },
+    };
+
+    const equal = every(obj, (key, value) => value === 1, true);
+
+    expect(equal).toBe(true);
+  });
+
+  test('should return false if one or more values including deep object values evaluate to false when follow is true', () => {
+    const obj = {
+      a: 1,
+      b: 1,
+      c: 1,
+      d: {
+        e: 2,
+      },
+    };
+
+    const equal = every(obj, (key, value) => value === 1, true);
+
+    expect(equal).toBe(false);
+  });
+});