kata-containers/src/runtime/pkg/katatestutils

Kata test utilities

This package provides a small set of test utilities. See the GoDoc for full details.

Test Constraints

This package provides helper functions that accept user-specified constraints that allow you to skip tests.

Usage

Create a TestConstraint object using the NewTestConstraint() constructor. This takes a single boolean parameter that specifies if debug output is generated.

In each test that has particular test constraints, call the NotValid() method on the TestConstraint object, passing one or more constraints that you want to be valid.

The NotValid() function returns true if any of the specified constraints are not available. This allows for a more natural way to code an arbitrarily complex test skip as shown in the following example.

The main object is created in the init() function to make it available for all tests:

import ktu "katatestutils"

var tc ktu.TestConstraint

func init() {
    tc = NewTestConstraint(true)
}

func TestFoo(t *testing.T) {

    // Specify one or more constraint functions. If not satisfied, the test
    // will be skipped.
    if tc.NotValid(...) {
        t.Skip("skipping test")
    }

    // Test code ...
}

Displaying the TestConstraint

Note that you could add the TestConstraint object to the Skip() call as it will provide details of why the skip occurred:

if tc.NotValid(...) {
    t.Skipf("skipping test as requirements not met: %v", tc)
}

Associating an issue with a constraint

You can add a constraint which specifies an issue URL for the skip. No checking is performed on the issue but if specified, it will be added to the TestConstraint and recorded in error messages and when that object is displayed:

if tc.NotValid(WithIssue("https://github.com/kata-containers/runtime/issues/1586"), ...) {
    t.Skipf("skipping test as requirements not met: %v", tc)
}

Examples

Skip tests based on user

Use the NeedRoot() constraint to skip a test unless running as root:

func TestOnlyRunWhenRoot(t *testing.T) {

    if tc.NotValid(ktu.NeedRoot()) {
        t.Skip("skipping test as not running as root user")
    }

    // Test code to run as root user ...
}

Use the NeedNonRoot() constraint to skip a test unless running as a non-root user:

func TestOnlyRunWhenNotRoot(t *testing.T) {

    if tc.NotValid(ktu.NeedNonRoot()) {
        t.Skip("skipping test as running as root user")
    }

    // Test code to run as non-root user ...
}

Skip tests based on kernel version

Use the NeedKernelVersionGE() constraint to skip a test unless running on a system with at least the specified kernel version:

func TestNewKernelVersion(t *testing.T) {

    if tc.NotValid(ktu.NeedKernelVersionGE("5.0.10")) {
        t.Skip("skipping test as kernel is too old")
    }

    // Test code to run on specified kernel version (or newer) ...
}

Use the NeedKernelVersionLT() constraint to skip a test unless running on a system whose kernel is older than the specified kernel version:

func TestOldKernelVersion(t *testing.T) {

    if tc.NotValid(ktu.NeedKernelVersionLT("4.14.114")) {
        t.Skip("skipping test as kernel is too new")
    }

    // Test code to run on specified kernel version (or newer) ...
}

Full details

The public API is shown in constraints_api.go or the GoDoc.