[ADF-4713] Add new DecimalNumber Pipe to transform and localize numbers (#4926)

* [ADF-4713] Add new DecimalNumber Pipe to transform and localize numbers

* Unsubscribe from userPreference service

* Make Pipe impure

* Add documentation in localization page

lib/core/pipes/decimal-number.pipe.spec.ts

@@ -0,0 +1,74 @@
+/*!
+ * @license
+ * Copyright 2019 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { async, TestBed } from '@angular/core/testing';
+import { AppConfigService } from '../app-config/app-config.service';
+import { UserPreferencesService } from '../services/user-preferences.service';
+import { of } from 'rxjs';
+import { setupTestBed } from '../testing/setupTestBed';
+import { CoreTestingModule } from '../testing/core.testing.module';
+import { DecimalNumberPipe } from './decimal-number.pipe';
+
+describe('DecimalNumberPipe', () => {
+
+    let pipe: DecimalNumberPipe;
+    let userPreferences: UserPreferencesService;
+
+    setupTestBed({
+        imports: [CoreTestingModule]
+    });
+
+    beforeEach(async(() => {
+        userPreferences = TestBed.get(UserPreferencesService);
+        spyOn(userPreferences, 'select').and.returnValue(of(''));
+        pipe = new DecimalNumberPipe(userPreferences, new AppConfigService(null));
+    }));
+
+    it('should return number localized and rounded following the default config', () => {
+        expect(pipe.transform(1234.567)).toBe('1,234.57');
+    });
+
+    it('should return number with at least the minimum of digints in the integer part', () => {
+        const decimalValues = {
+            minIntegerDigits: 6,
+            minFractionDigits: undefined,
+            maxFractionDigits: undefined
+        };
+
+        expect(pipe.transform(1234.567, decimalValues)).toBe('001,234.57');
+    });
+
+    it('should return number with at least the minimum of digints in the integer part', () => {
+        const decimalValues = {
+            minIntegerDigits: undefined,
+            minFractionDigits: 4,
+            maxFractionDigits: 10
+        };
+
+        expect(pipe.transform(1234.567, decimalValues)).toBe('1,234.5670');
+    });
+
+    it('should return number with at least the minimum of digints in the integer part', () => {
+        const decimalValues = {
+            minIntegerDigits: undefined,
+            minFractionDigits: 0,
+            maxFractionDigits: 1
+        };
+
+        expect(pipe.transform(1234.567, decimalValues)).toBe('1,234.6');
+    });
+});