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diff --git a/server/sonar-ui-common/helpers/__tests__/ratings-test.ts b/server/sonar-ui-common/helpers/__tests__/ratings-test.ts
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+++ b/server/sonar-ui-common/helpers/__tests__/ratings-test.ts
@@ -0,0 +1,114 @@
+/*
+ * SonarQube
+ * Copyright (C) 2009-2021 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+import {
+  getCoverageRatingAverageValue,
+  getCoverageRatingLabel,
+  getDuplicationsRatingAverageValue,
+  getDuplicationsRatingLabel,
+  getSizeRatingAverageValue,
+  getSizeRatingLabel,
+} from '../ratings';
+
+describe('getCoverageRatingLabel', () => {
+  it('should fail', () => {
+    expect(() => {
+      getCoverageRatingLabel(-1);
+    }).toThrow();
+  });
+  it.each([
+    [1, '≥ 80%'],
+    [2, '70% - 80%'],
+    [3, '50% - 70%'],
+    [4, '30% - 50%'],
+    [5, '< 30%'],
+  ])('should return the correct label for %s', (rating, label) => {
+    expect(getCoverageRatingLabel(rating)).toBe(label);
+  });
+});
+
+describe('getCoverageRatingAverageValue', () => {
+  it.each([
+    [1, 90],
+    [2, 75],
+    [3, 60],
+    [4, 40],
+    [5, 15],
+  ])('should return the correct value', (rating, value) => {
+    expect(getCoverageRatingAverageValue(rating)).toBe(value);
+  });
+});
+
+describe('getDuplicationsRatingLabel', () => {
+  it('should fail', () => {
+    expect(() => {
+      getCoverageRatingLabel(-1);
+    }).toThrow();
+  });
+  it.each([
+    [1, '< 3%'],
+    [2, '3% - 5%'],
+    [3, '5% - 10%'],
+    [4, '10% - 20%'],
+    [5, '> 20%'],
+  ])('should return the correct label for %s', (rating, label) => {
+    expect(getDuplicationsRatingLabel(rating)).toBe(label);
+  });
+});
+
+describe('getDuplicationsRatingAverageValue', () => {
+  it.each([
+    [1, 1.5],
+    [2, 4],
+    [3, 7.5],
+    [4, 15],
+    [5, 30],
+  ])('should return the correct value', (rating, value) => {
+    expect(getDuplicationsRatingAverageValue(rating)).toBe(value);
+  });
+});
+
+describe('getSizeRatingLabel', () => {
+  it('should fail', () => {
+    expect(() => {
+      getCoverageRatingLabel(-1);
+    }).toThrow();
+  });
+  it.each([
+    [1, '< 1k'],
+    [2, '1k - 10k'],
+    [3, '10k - 100k'],
+    [4, '100k - 500k'],
+    [5, '> 500k'],
+  ])('should return the correct label for %s', (rating, label) => {
+    expect(getSizeRatingLabel(rating)).toBe(label);
+  });
+});
+
+describe('getSizeRatingAverageValue', () => {
+  it.each([
+    [1, 500],
+    [2, 5000],
+    [3, 50000],
+    [4, 250000],
+    [5, 750000],
+  ])('should return the correct value', (rating, value) => {
+    expect(getSizeRatingAverageValue(rating)).toBe(value);
+  });
+});