File size: 1,043 Bytes
f7a7bb1 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | // Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build SELECT_USING_THIS_TAG
package cfile
import "testing"
var funcInvoked bool
//go:noinline
func thisFunctionOnlyCalledFromSnapshotTest(n int) int {
if funcInvoked {
panic("bad")
}
funcInvoked = true
// Contents here not especially important, just so long as we
// have some statements.
t := 0
for i := 0; i < n; i++ {
for j := 0; j < i; j++ {
t += i ^ j
}
}
return t
}
// Tests runtime/coverage.snapshot() directly. Note that if
// coverage is not enabled, the hook is designed to just return
// zero.
func TestCoverageSnapshotImpl(t *testing.T) {
C1 := Snapshot()
thisFunctionOnlyCalledFromSnapshotTest(15)
C2 := Snapshot()
cond := "C1 > C2"
val := C1 > C2
if testing.CoverMode() != "" {
cond = "C1 >= C2"
val = C1 >= C2
}
t.Logf("%f %f\n", C1, C2)
if val {
t.Errorf("erroneous snapshots, %s = true C1=%f C2=%f",
cond, C1, C2)
}
}
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