Move NullReader from nomad to util package.

util/util_test.go

@@ -0,0 +1,18 @@
+package util
+
+import (
+	"github.com/stretchr/testify/assert"
+	"gitlab.hpi.de/codeocean/codemoon/poseidon/tests"
+	"testing"
+)
+
+func TestNullReaderDoesNotReturnImmediately(t *testing.T) {
+	reader := &NullReader{}
+	readerReturned := make(chan bool)
+	go func() {
+		p := make([]byte, 5)
+		_, _ = reader.Read(p)
+		close(readerReturned)
+	}()
+	assert.False(t, tests.ChannelReceivesSomething(readerReturned, tests.ShortTimeout))
+}