How to write angular unit test for function and switch case

Question

extractValue(exemptionLevel: string, exemptionValue: any): string {
switch(exemptionLevel) {
  case "C": return exemptionValue.isoCountryCode.toString();
  case "R": return exemptionValue.districtNumber.toString();
  case "D": return exemptionValue.divisionCode.toString();
  case "T": return exemptionValue.terminalNumber.toString();
}

}

i tried below

it('expected value extractValue() c', () => {
component.extractValue('C','isoCountry');
expect('C').toEqual('isoCountry')

// expect(component.extractValue(expectedLevel[0], exemptionValue.isoCountryCode)).toHaveBeenCalled();

});

it showing error TypeError: Cannot read property 'toString' of undefined

mat.hudak · Accepted Answer · 2021-10-17 09:22:01Z

1

You are sending a string parameter to the function and you are expecting to access its isoCountryCode property, which will always be undefined. You have to provide the tested function with exemptionValue mock.

it('expected value extractValue() c', () => {
  const isoCountryMockResult = 'someResult';
  const exemptionValue = { isoCountryCode: isoCountryMockResult } // define your mock
  component.extractValue('C', exemptionValue);
  expect('C').toEqual(isoCountryMockResult)
}

This should work, but you have to adjust it to your needs

answered Oct 17, 2021 at 9:22

mat.hudak

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4 Comments

Angular doubt Over a year ago

working fine . thankyou dallows

mat.hudak Over a year ago

You should accept the answer then

Angular doubt Over a year ago

i accepted.. Thanks for the feedback! You need at least 15 reputation to cast a vote, but your feedback has been recorded.

Angular doubt Over a year ago

How to write testcase subscribe inside constructor ` constructor(private exemptionService:ExemptionService){ this.exemptionService.getGlobalExemptionReasons().subscribe(reason => this.reason = reason); }`

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