Why is it that the Jasmine test is unsuccessful even though the 'expected' and 'toBe' strings appear to be identical?

I have been developing a web application using Angular (version 2.4.0) and TypeScript. The application utilizes a custom currency pipe, which leverages Angular's built-in CurrencyPipe to format currency strings for both the 'en-CA' and 'fr-CA' Canadian locales. During the process of writing unit tests for the French locale, specifically when testing the scenario where the expected output is a properly formatted currency string for a valid input, I encountered an issue.

describe('for French locale', () => {
 // obtain the mock instance of the custom currency pipe for 'fr-CA' locale as 'currencyPipeForFR'
 it('should be formatted for fr-CA locale', () => {
  expect(currencyPipeForFR.transform('7500')).toBe('7 500 $');
 });
});

The error message I received was:

Expected '7 500 $' to be '7 500 $'.

Upon verifying that the transformed result is indeed a String, I am puzzled as to what could be causing this discrepancy. Any guidance on resolving this issue would be greatly appreciated.

angulartypescriptjasminepipeseparator

Answer №1

After investigating, it was discovered that the issue stemmed from the way the CurrencyPipe in Angular handled the grouping/thousand separator for the 'fr-CA' locale. By examining the UTF-16 code unit values of each character in the string, it was noticed that the grouping/thousand separator character (\u00A0) at index 1 (located between 7 and 5 in the output value of '7 500 $') differed from the standard space bar character (\u0020). The space before the '$' symbol in the expected output '7 500 $' was represented by \u0020 (normal space bar character), which was manually added to the result obtained from the built-in pipe within the custom pipe’s logic.

To address such issues when working with locale-dependent pipes like the CurrrencyPipe or DecimalPipe, a solution involving the use of the toLocaleString() method of the Number.prototype property was implemented. Here is an example:

describe('for French locale', () => {
 // create a custom currency pipe instance for 'fr-CA' locale named 'currencyPipeForFR'
 const thousandSeparator = () => {
  return (1000).toLocaleString('fr-CA').substring(1, 2);
 }
 it('should be formatted for fr-CA locale', () => {
  expect(currencyPipeForFR.transform('7500')).toBe('7' + thousandSeparator() + '500 $');
 });
});

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