Integration tests

Run integration tests by building your application with coverage enabled, executing it with the GOCOVERDIR environment variable set, and then processing the resulting profile files using go tool covdata.

mkdir ./profiledir
go build -cover -o myapp.exe .
GOCOVERDIR=./profiledir ./myapp.exe

After execution, generate a coverage report or merge profiles using the covdata tool:

go tool covdata percent -i=profiledir

For compiler-specific integration tests like stack slot merging, use the go tool compile command with debug flags:

go tool compile -p=p -c 1 -o p.a -d=mergelocalstrace=2,mergelocals=1 integration.go

Integration tests verify that different parts of your system work together correctly by running the actual application or specific compiler tools. You build the software with special flags to track execution, run it to generate data files, and then use a reporting tool to analyze the results. Think of it like running a car on a test track to measure its speed and fuel efficiency rather than just checking the engine in a garage.