Organize tests

test/browser/spec/ol/functions.test.js

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+import {memoizeOne} from '../../../../src/ol/functions.js';
+
+describe('ol/functions', function () {
+  describe('memoizeOne()', function () {
+    it('returns the result from the first call when called a second time with the same args', function () {
+      const arg1 = {};
+      const arg2 = {};
+      const arg3 = {};
+      function call(a1, a2, a3) {
+        return {};
+      }
+      const memoized = memoizeOne(call);
+      const result = memoized(arg1, arg2, arg3);
+      expect(memoized(arg1, arg2, arg3)).to.be(result);
+    });
+
+    it('returns the result from the first call when called a second time with the same this object', function () {
+      const arg1 = {};
+      const arg2 = {};
+      const arg3 = {};
+      function call(a1, a2, a3) {
+        return {};
+      }
+      const memoized = memoizeOne(call);
+
+      const thisObj = {};
+
+      const result = memoized.call(thisObj, arg1, arg2, arg3);
+      expect(memoized.call(thisObj, arg1, arg2, arg3)).to.be(result);
+    });
+
+    it('returns a different result when called a second time with the different args', function () {
+      const arg1 = {};
+      const arg2 = {};
+      const arg3 = {};
+      function call(a1, a2, a3) {
+        return {};
+      }
+      const memoized = memoizeOne(call);
+      const result = memoized(arg1, arg2, arg3);
+      expect(memoized(arg3, arg2, arg1)).not.to.be(result);
+    });
+
+    it('returns a different result when called a second time with a different this object', function () {
+      const arg1 = {};
+      const arg2 = {};
+      const arg3 = {};
+      function call(a1, a2, a3) {
+        return {};
+      }
+      const firstThis = {};
+      const secondThis = {};
+      const memoized = memoizeOne(call);
+      const result = memoized.call(firstThis, arg1, arg2, arg3);
+      expect(memoized.call(secondThis, arg1, arg2, arg3)).not.to.be(result);
+    });
+  });
+});