Positive test cases and negative test cases

Question

what are positive test cases and negative test cases?

Upon googling about it i have found answers that are very confusing. Can anyone explain with example?

Answer 1

A positive test case tests that a system does what it is supposed to. Example: will allow you to login when valid credentials are supplied.

A negative test case tests that a system does not do things it shouldn't. Example: should not allow you to login when invalid credentials are supplied.

Answer 2

Positive case is a case where the system validated against the valid input data

For example, consider a scenario where you want to test a application which contains a search field and requirements say that you should not enter special characters.

ID: 1

Name/Idea: Verifying that search field works with valid input

Precondition steps: "Search" screen should be opened

Steps to reproduce:

1. Fill search field with valid information

2. Tap on "Search" button

Expected result: The screen with results of search should be displayed

Positive/Negative: 1

Negative case is case where the system validated against the invalid input data. A negative test checks if a application behaves as expected with its negative inputs

For example, consider the same example which should accept only letters. So here provide the characters like “@,#,/” in the search field and check the behavior of application, either it should show a validation error message for all invalid inputs or system should not allow to enter special characters.

ID: 1

Name/Idea: Verifying that search field works with invalid input

Precondition steps: "Search" screen should be opened

Steps to reproduce:

1. Fill search field with invalid information (e.g. @,#,/)

2. Tap on "Search" button

Expected result: Pop-up with error message should appear

Positive/Negative: 0