The runtime answers a bulk read of kept state: the values after a key in one request (issue 1966)

Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i

node-tools/internal/runtime/state_history_test.go

@@ -134,7 +134,7 @@ func TestAKeysHistoryIsEveryValueKeptOldestFirst(t *testing.T) {
 
 // A module the bucket was not issued to is refused its history with the reason, as it is a get.
 func TestAKeysHistoryIsRefusedToAModuleNotIssuedTheState(t *testing.T) {
-	owner, _, other := historyBuses(t)
+	owner, reader, other := historyBuses(t)
 	if _, err := ask(owner, "put", map[string]any{"state": "issues", "key": "1", "value": 1}); err != nil {
 		t.Fatal(err)
 	}
@@ -149,4 +149,37 @@ func TestAKeysHistoryIsRefusedToAModuleNotIssuedTheState(t *testing.T) {
 		!strings.Contains(err.Error(), "not a key") {
 		t.Errorf("history of a key the bus cannot hold: %v", err)
 	}
+	// A page is the values in key order after a key, in one request, to the owner and to a reader, never to a
+	// module not issued the state; a page too small for two values still gives one and says where it goes on.
+	for k, v := range map[string]string{"2": `"bb"`, "3": `"cc"`} {
+		if _, err := ask(owner, "put", map[string]any{"state": "issues", "key": k, "value": json.RawMessage(v)}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	type page struct {
+		Entries []kept `json:"entries"`
+		Next    string `json:"next"`
+	}
+	for _, c := range []struct {
+		who, state, after string
+		max               int
+		keys              []string
+		next              string
+	}{{"owner", "issues", "", 1 << 20, []string{"1", "2", "3"}, ""}, {"reader", "issues.issues", "1", 1 << 20, []string{"2", "3"}, ""},
+		{"owner", "issues", "", 1, []string{"1"}, "1"}, {"owner", "issues", "1", 9, []string{"2"}, "2"}} {
+		b := map[string]launch.Bus{"owner": owner, "reader": reader}[c.who]
+		raw, err := ask(b, "page", map[string]any{"state": c.state, "after": c.after, "max_bytes": c.max})
+		var p page
+		if err != nil || json.Unmarshal(raw, &p) != nil || p.Next != c.next || len(p.Entries) != len(c.keys) {
+			t.Fatalf("page %+v = %s, %v", c, raw, err)
+		}
+		for i, k := range c.keys {
+			if p.Entries[i].Key != k {
+				t.Errorf("page %+v: entry %d is %s, want %s", c, i, p.Entries[i].Key, k)
+			}
+		}
+	}
+	if _, err := ask(other, "page", map[string]any{"state": "issues.issues"}); err == nil {
+		t.Errorf("a page given to a module not issued the state")
+	}
 }