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# Rudimentary test of testing.Coverage().
[short] skip
[!GOEXPERIMENT:coverageredesign] skip
# Simple test.
go test -v -cover -count=1
# Make sure test still passes when test executable is built and
# run outside the go command.
go test -c -o t.exe -cover
exec ./t.exe
-- go.mod --
module hello
go 1.20
-- hello.go --
package hello
func Hello() {
println("hello")
}
// contents not especially interesting, just need some code
func foo(n int) int {
t := 0
for i := 0; i < n; i++ {
for j := 0; j < i; j++ {
t += i ^ j
if t == 1010101 {
break
}
}
}
return t
}
-- hello_test.go --
package hello
import "testing"
func TestTestCoverage(t *testing.T) {
Hello()
C1 := testing.Coverage()
foo(29)
C2 := testing.Coverage()
if C1 == 0.0 || C2 == 0.0 {
t.Errorf("unexpected zero values C1=%f C2=%f", C1, C2)
}
if C1 >= C2 {
t.Errorf("testing.Coverage() not monotonically increasing C1=%f C2=%f", C1, C2)
}
}
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