1
2# Rudimentary test of testing.Coverage().
3
4[short] skip
5[!GOEXPERIMENT:coverageredesign] skip
6
7# Simple test.
8go test -v -cover -count=1
9
10# Make sure test still passes when test executable is built and
11# run outside the go command.
12go test -c -o t.exe -cover
13exec ./t.exe
14
15-- go.mod --
16module hello
17
18go 1.20
19-- hello.go --
20package hello
21
22func Hello() {
23 println("hello")
24}
25
26// contents not especially interesting, just need some code
27func foo(n int) int {
28 t := 0
29 for i := 0; i < n; i++ {
30 for j := 0; j < i; j++ {
31 t += i ^ j
32 if t == 1010101 {
33 break
34 }
35 }
36 }
37 return t
38}
39
40-- hello_test.go --
41package hello
42
43import "testing"
44
45func TestTestCoverage(t *testing.T) {
46 Hello()
47 C1 := testing.Coverage()
48 foo(29)
49 C2 := testing.Coverage()
50 if C1 == 0.0 || C2 == 0.0 {
51 t.Errorf("unexpected zero values C1=%f C2=%f", C1, C2)
52 }
53 if C1 >= C2 {
54 t.Errorf("testing.Coverage() not monotonically increasing C1=%f C2=%f", C1, C2)
55 }
56}
57
View as plain text