Individual functionality tests for ScaledSheet

Author: Nir Hadassi

__tests__/ScaledSheet.spec.js

@@ -2,44 +2,94 @@ jest.mock('react-native');
 import { scale, verticalScale, moderateScale } from '../lib/scalingUtils';
 import ScaledSheet from '../lib/ScaledSheet';
 
-const input = {
-    container: {
-        width: '30@s',
-        height: '50@vs',
-        margin: {
-            width: 12,
-            height: '12@s',
-            paddingBottom: -1
+const getRandomInt = (min = 1, max = 100) => Math.floor(Math.random() * (max - min + 1)) + min;
+
+test('Scale works', () => {
+    const number = getRandomInt();
+    const input = { test: `${number}@s` }
+    expect(ScaledSheet.create(input).test).toBe(scale(number));
+});
+
+test('verticalScale works', () => {
+    const number = getRandomInt();
+    const input = { test: `${number}@vs` }
+    expect(ScaledSheet.create(input).test).toBe(verticalScale(number));
+});
+
+test('moderateScale with default factor works', () => {
+    const number = getRandomInt();
+    const input = { test: `${number}@ms` }
+    expect(ScaledSheet.create(input).test).toBe(moderateScale(number));
+});
+
+test('moderateScale with custom factor works', () => {
+    const number = getRandomInt();
+    const input = { test: `${number}@ms0.7` }
+    expect(ScaledSheet.create(input).test).toBe(moderateScale(number, 0.7));
+});
+
+test('Scale works with a negative value', () => {
+    const number = getRandomInt(-100, -1);
+    const input = { test: `${number}@s` }
+    expect(ScaledSheet.create(input).test).toBe(scale(number));
+});
+
+test('moderateScale works with a negative value', () => {
+    const number = getRandomInt(-100, -1);
+    const input = { test: `${number}@ms0.3` }
+    expect(ScaledSheet.create(input).test).toBe(moderateScale(number, 0.3));
+});
+
+test('Scale works on a deeply nested object', () => {
+    const number = getRandomInt();
+    const input = { test: { test: { test: `${number}@s` } } }
+    expect(ScaledSheet.create(input).test.test.test).toBe(scale(number));
+});
+
+test('No special annotation should leave the number intact', () => {
+    const number = getRandomInt();
+    const input = { test: number }
+    expect(ScaledSheet.create(input).test).toBe(number);
+});
+
+test('ScaledSheet should map a complete StyleSheet with special annotations', () => {
+    const input = {
+        container: {
+            width: '30@s',
+            height: '50@vs',
+            margin: {
+                width: 12,
+                height: '12@s',
+                paddingBottom: -1
+            }
+        },
+        row: {
+            padding: '10@ms0.3',
+            height: '34@ms',
+            marginRight: '0.5@ms0.9',
+            marginLeft: '-0.5@ms0.9',
+            marginTop: '-10@s',
         }
-    },
-    row: {
-        padding: '10@ms0.3',
-        height: '34@ms',
-        marginRight: '0.5@ms0.9',
-        marginLeft: '-0.5@ms0.9',
-        marginTop: '-10@s',
-    }
-};
-
-const expectedOutput = {
-    container: {
-        width: scale(30),
-        height: verticalScale(50),
-        margin: {
-            width: 12,
-            height: scale(12),
-            paddingBottom: -1
+    };
+
+    const expectedOutput = {
+        container: {
+            width: scale(30),
+            height: verticalScale(50),
+            margin: {
+                width: 12,
+                height: scale(12),
+                paddingBottom: -1
+            }
+        },
+        row: {
+            padding: moderateScale(10, 0.3),
+            height: moderateScale(34),
+            marginRight: moderateScale(0.5, 0.9),
+            marginLeft: moderateScale(-0.5, 0.9),
+            marginTop: scale(-10),
         }
-    },
-    row: {
-        padding: moderateScale(10, 0.3),
-        height: moderateScale(34),
-        marginRight: moderateScale(0.5, 0.9),
-        marginLeft: moderateScale(-0.5, 0.9),
-        marginTop: scale(-10),
-    }
-};
-
-test('ScaledSheet should map the special annotations as expected', () => {
+    };
+
     expect(JSON.stringify(ScaledSheet.create(input))).toBe(JSON.stringify(expectedOutput));
-});
+});