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