internal: testutil: add DevZero helper
This helper acts like /dev/zero (outputs \x00 indefinitely) in an
OS-independent fashion. This ensures we don't need to special-case
around Windows in tests that want to open /dev/zero.
package testutil
import (
+ "io"
+
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
@@ -11,3 +13,15 @@ func ErrorContains(t require.TestingT, err error, expectedError string, msgAndAr
require.Error(t, err, msgAndArgs...)
assert.Contains(t, err.Error(), expectedError, msgAndArgs...)
}
+
+// DevZero acts like /dev/zero but in an OS-independent fashion.
+var DevZero io.Reader = devZero{}
+
+type devZero struct{}
+
+func (d devZero) Read(p []byte) (n int, err error) {
+ for i := 0; i < len(p); i++ {
+ p[i] = '\x00'
+ }
+ return len(p), nil
+}
