A presentation at KCDC 2021 in in Kansas City, MO, USA by Scott McAllister
KCDC — SEPT 17, 2021 BUILT-IN TESTING IN GO IS MORE THAN JUST PASSABLE Scott McAllister PagerDuty @stmcallister
go-pagerduty library @stmcallister
The Go programming language is an open source project to make programmers more productive.
Really, Really Brief Introduction to Go ● Released by Google in 2009 ● Designed to help solve Google’s problems ● Main Characteristics ○ Open-Source ○ Statically Typed ○ Concurrency Support ○ Powerful Standard Library ○ Built-in Testing ○ Garbage Collection
Testing Evaluate and verify that the code does what is expected @stmcallister
Unit Testing Testing the smallest piece of code that can be logically isolated @stmcallister
Integration Testing Testing combined modules as a group @stmcallister
Testing in Go @stmcallister
TESTING IN GO Test code typically lives in the same package as the code it tests @stmcallister
TESTING IN GO Test code typically lives in the same package as the code it tests
Name of test files end in *_test.go
@stmcallister
TEST FUNCTIONS You can define methods on any type:
func TestHelloEmpty(t *testing.T) { msg, err := Hello(“”) if msg != “” || err == nil { t.Fatalf(Hello("") = %q, %v, want "", error, msg, err) } }
@stmcallister
Function names begin with ‘Test’ Functions receive pointer to testing.T
Running Go Tests go test @stmcallister
Subtests @stmcallister
Additional Resources go-test-demos https://github.com/stmcallister/go-test-demos go-pagerduty https://github.com/PagerDuty/go-pagerduty @stmcallister
Testing is vital to any software project. Automated tests help improve confidence in code changes as you increase project velocity. Finding the right tools and libraries can be an arduous process. And, in most languages, adding testing means adding a pile of new dependencies to the project. But, have you ever tried the tools built right into the language? One of the beauty’s of the Go programming language is built with productivity in mind. The creators of the language have included many tools that make developers productive—including a robust testing framework. Come see how easy it is to get started with Go’s testing library and see many of the features that will keep you using it in all your projects.
The following resources were mentioned during the presentation or are useful additional information.
Sample code that illustrates the type of testing discussed in the talk and simple examples for how to do it.
Project that shows more “real world” examples of testing in Go. This code was also talked about in the talk.
for free. You
can too.