Add some tests verifying request map ordering

requesting_test.go

@@ -0,0 +1,43 @@
+package torrent
+
+import (
+	"testing"
+
+	pp "github.com/anacrolix/torrent/peer_protocol"
+	qt "github.com/frankban/quicktest"
+)
+
+func keysAsSlice(m map[Request]struct{}) (sl []Request) {
+	for k := range m {
+		sl = append(sl, k)
+	}
+	return
+}
+
+func makeTypicalRequests() map[Request]struct{} {
+	m := make(map[Request]struct{})
+	for p := pp.Integer(0); p < 4; p++ {
+		for c := pp.Integer(0); c < 16; c++ {
+			m[Request{p, ChunkSpec{c * defaultChunkSize, defaultChunkSize}}] = struct{}{}
+		}
+	}
+	return m
+}
+
+func TestLogExampleRequestMapOrdering(t *testing.T) {
+	for k := range makeTypicalRequests() {
+		t.Log(k)
+	}
+
+}
+
+func TestRequestMapOrderingPersistent(t *testing.T) {
+	m := makeTypicalRequests()
+	// Shows that map order is persistent across separate range statements.
+	qt.Assert(t, keysAsSlice(m), qt.ContentEquals, keysAsSlice(m))
+}
+
+func TestRequestMapOrderAcrossInstances(t *testing.T) {
+	// This shows that different map instances with the same contents can have the same range order.
+	qt.Assert(t, keysAsSlice(makeTypicalRequests()), qt.ContentEquals, keysAsSlice(makeTypicalRequests()))
+}