The art of crafting informative error log messages in Protractor using TypeScript

Question

The art of crafting informative error log messages in Protractor using TypeScript

I am currently utilizing Protractor, written in typescript, to conduct tests on a live website. I am seeking guidance on how to generate log messages when a Protractor test fails. Presently, the only feedback received is a simple YES/NO message, as shown below:

10) Query page accuracy test. Comparison of page data to data extracted from excel. Test begins...
  Message:
    Expected false to be truthy.
  Stack:
    Error: Failed expectation
        at C:\xampp\htdocs\kap\frontend\src\app\qa\qa.js:147:103
        at step (C:\xampp\htdocs\kap\frontend\src\app\qa\qa.js:33:23)
        at Object.next (C:\...

This is the line where the test is conducted:

expect(htmlValue == excelValue || (htmlValue === "0" && excelValue == "NaN")).toBeTruthy();

I am interested in adding more informative error messages for failed tests. Any assistance would be appreciated since I am relatively new to Protractor, although I have experience with QA automation tests.

typescript testing error-handling protractor

Answer 1

Answer №1

To enhance the functionality of ToBeTruthy, consider incorporating a descriptive message:

expect(htmlValue == excelValue || (htmlValue === "0" && excelValue == "NaN")).toBeTruthy("reason for verification")

If needed, you can exhibit failed test values like this:

expect(
  htmlValue == excelValue || (htmlValue === '0' && excelValue == 'NaN'),
).toBeTruthy(
  `Difference between HTML and Excel. Values - HTML: ${htmlValue}; Excel: ${excelValue}`,
);

Virtually all jasmine Matchers permit an expectationFailOutput parameter:

toBe(expected: any, expectationFailOutput?: any): Promise<void>;
toEqual(expected: any, expectationFailOutput?: any): Promise<void>;
toMatch(expected: string | RegExp | Promise<string | RegExp>, expectationFailOutput?: any): Promise<void>;
toBeDefined(expectationFailOutput?: any): Promise<void>;
toBeUndefined(expectationFailOutput?: any): Promise<void>;
toBeNull(expectationFailOutput?: any): Promise<void>;
toBeTruthy(expectationFailOutput?: any): Promise<void>;
toBeFalsy(expectationFailOutput?: any): Promise<void>;
toContain(expected: any, expectationFailOutput?: any): Promise<void>;
toBeLessThan(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeLessThanOrEqual(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeGreaterThan(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeGreaterThanOrEqual(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeCloseTo(expected: number | Promise<number>, precision?: any, expectationFailOutput?: any): Promise<void>;

The definitions for Matchers can be found in the jasminewd2 repository

Answer 2

To enhance the functionality of ToBeTruthy, consider incorporating a descriptive message:

expect(htmlValue == excelValue || (htmlValue === "0" && excelValue == "NaN")).toBeTruthy("reason for verification")

If needed, you can exhibit failed test values like this:

expect(
  htmlValue == excelValue || (htmlValue === '0' && excelValue == 'NaN'),
).toBeTruthy(
  `Difference between HTML and Excel. Values - HTML: ${htmlValue}; Excel: ${excelValue}`,
);

Virtually all jasmine Matchers permit an expectationFailOutput parameter:

toBe(expected: any, expectationFailOutput?: any): Promise<void>;
toEqual(expected: any, expectationFailOutput?: any): Promise<void>;
toMatch(expected: string | RegExp | Promise<string | RegExp>, expectationFailOutput?: any): Promise<void>;
toBeDefined(expectationFailOutput?: any): Promise<void>;
toBeUndefined(expectationFailOutput?: any): Promise<void>;
toBeNull(expectationFailOutput?: any): Promise<void>;
toBeTruthy(expectationFailOutput?: any): Promise<void>;
toBeFalsy(expectationFailOutput?: any): Promise<void>;
toContain(expected: any, expectationFailOutput?: any): Promise<void>;
toBeLessThan(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeLessThanOrEqual(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeGreaterThan(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeGreaterThanOrEqual(expected: number | Promise<number>, expectationFailOutput?: any): Promise<void>;
toBeCloseTo(expected: number | Promise<number>, precision?: any, expectationFailOutput?: any): Promise<void>;

The definitions for Matchers can be found in the jasminewd2 repository

Answer 3

Answer №2

Although the suggested solutions could possibly work, it is not recommended to use them due to the excessive typing required and the resulting unreadable code

The two options that are officially supported by the default framework, Jasmine, are:

For Protractor 6+, you can utilize the built-in method .withContext(). Unfortunately, there is limited documentation provided by the Jasmine team. The general syntax is
```
expect(true).withContext("your description").toBe(false);
```
, which can be used with any Jasmine assertion, not just .toBeTruthy()
For Protractor versions prior to 6, there is an undocumented feature where every assertion takes two arguments - the expected value first, followed by a message for failure. For example,

expect("first value").toBe("second value", "verification of some values")

This will result in failure with the following message

- Expected 'first value' to be 'second value', 'verification of some values'.

Answer 4

Although the suggested solutions could possibly work, it is not recommended to use them due to the excessive typing required and the resulting unreadable code

The two options that are officially supported by the default framework, Jasmine, are:

For Protractor 6+, you can utilize the built-in method .withContext(). Unfortunately, there is limited documentation provided by the Jasmine team. The general syntax is
```
expect(true).withContext("your description").toBe(false);
```
, which can be used with any Jasmine assertion, not just .toBeTruthy()
For Protractor versions prior to 6, there is an undocumented feature where every assertion takes two arguments - the expected value first, followed by a message for failure. For example,

expect("first value").toBe("second value", "verification of some values")

This will result in failure with the following message

- Expected 'first value' to be 'second value', 'verification of some values'.

Answer 5

Answer №3

If you want to personalize your message, feel free to do so with jasmine matchers such as:

expect(true).toBe(true, "You can display a custom message here")

expect(htmlValue == excelValue || (htmlValue === "0" && excelValue == "NaN")).toBeTruthy(`Expected ${excelValue}` but received ${htmlValue});

Answer 6

If you want to personalize your message, feel free to do so with jasmine matchers such as:

expect(true).toBe(true, "You can display a custom message here")

expect(htmlValue == excelValue || (htmlValue === "0" && excelValue == "NaN")).toBeTruthy(`Expected ${excelValue}` but received ${htmlValue});

The art of crafting informative error log messages in Protractor using TypeScript

Answer №1

Answer №2

Answer №3

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