# How to group selected tests from a set of tests in pytest?

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We can group selected tests for execution from a set of tests in pytest.Pytest is a test framework in python. To install pytest, we need to use the commandpip install pytest. After installation, we can verify if python has been installed by the command pytest –version. The version of pytest shall be known.

Pytest can be used for creating and executing test cases. It can be used in wide range testing API, UI, database and so on. The test file of pytest has a naming convention that it starts with test_ or ends with _test keyword and every line of code should be inside a method which should have a name starting with test keyword. Also each method should have a unique name.

In order to print the console logs, we need to use the command py.test –v –s. Again, if we want to run tests from a specific pytest file, the command is py.test <filename> -v.

Pytest gives the feature of markers on the test methods. The marker is used to give properties or attributes to the test methods. Some of the default markers are skip, xfail and parametrize. Besides, there can be more customized markers as per our need.

The markers are associated with the test method with the following syntax − @py.test.mark.<markername>. Also to use markers, we have to import pytest to our test file. To execute the marked test methods, the command is py.test -m <markername> -v.

Here -m <markername> is the name of the marker and v means verbose.

Let us consider a pytest file having test methods.

import pytest
@pytest.mark.loan
def test_CalculateLoan():
print("Loan calculation")
def test_CalculateLease():
print("Lease calculation")

Let us consider another pytest file having test methods.

import pytest
@pytest.mark.loan
def test_CalculateRepay():
print("Loan calculation")
def test_FindLease():
print("Lease search")

To run a group of test methods having a user defined mark as loan, the command should be py.test -m loan –v. In our example test methods having mark as loan, shall be chosen for execution. In this case, the CalculateLoan() and the CalculateRepay() will be executed.

Published on 29-Jul-2020 12:44:52