feat(APIM-468): copying missed unit test for get-int-config helper

src/helpers/get-int-config.helper.test.ts

@@ -0,0 +1,47 @@
+import { InvalidConfigException } from '@ukef/config/invalid-config.exception';
+
+import { getIntConfig } from './get-int-config';
+
+describe('Get integer configuration value Helper', () => {
+  describe('getIntConfig returns value', () => {
+    it.each([
+      { value: undefined, defaultValue: 60, expectedResult: 60 },
+      { value: '123', defaultValue: 60, expectedResult: 123 },
+      { value: '123', defaultValue: undefined, expectedResult: 123 },
+      { value: '-123', defaultValue: 60, expectedResult: -123 },
+      { value: '0', defaultValue: 60, expectedResult: 0 },
+      { value: `${Number.MAX_SAFE_INTEGER}`, defaultValue: 60, expectedResult: Number.MAX_SAFE_INTEGER },
+      { value: `-${Number.MAX_SAFE_INTEGER}`, defaultValue: 60, expectedResult: -Number.MAX_SAFE_INTEGER },
+    ])('if input is "$value", returns $expectedResult', ({ value, defaultValue, expectedResult }) => {
+      expect(getIntConfig(value, defaultValue)).toBe(expectedResult);
+    });
+  });
+
+  describe('getIntConfig throws invalid integer exception', () => {
+    it.each(['abc', '12.5', '20th', '0xFF', '0b101'])(`throws InvalidConfigException for "%s" because it is not valid integer`, (value) => {
+      const gettingTheConfig = () => getIntConfig(value as unknown as string);
+
+      expect(gettingTheConfig).toThrow(InvalidConfigException);
+      expect(gettingTheConfig).toThrow(`Invalid integer value "${value}" for configuration property.`);
+    });
+  });
+
+  describe('getIntConfig throws InvalidConfigException because environment variable type is not string', () => {
+    it.each([12, true, null, false, /.*/, {}, [], 0xff, 0b101])(
+      'throws InvalidConfigException for "%s" because environment variable type is not string',
+      (value) => {
+        const gettingTheConfig = () => getIntConfig(value as unknown as string);
+
+        expect(gettingTheConfig).toThrow(InvalidConfigException);
+        expect(gettingTheConfig).toThrow(`Input environment variable type for ${value} should be string.`);
+      },
+    );
+  });
+
+  it('throws InvalidConfigException if environment variable and default value is missing', () => {
+    const gettingTheConfig = () => getIntConfig(undefined);
+
+    expect(gettingTheConfig).toThrow(InvalidConfigException);
+    expect(gettingTheConfig).toThrow("Environment variable is missing and doesn't have default value.");
+  });
+});