Redesign CSF framework (RIPD-1361):

- Separate `Scheduler` from `BasicNetwork`.
- Add an event/collector framework for monitoring invariants and calculating statistics.
- Allow distinct network and trust connections between Peers.
- Add a simple routing strategy to support broadcasting arbitrary messages.
- Add a common directed graph (`Digraph`) class for representing network and trust topologies.
- Add a `PeerGroup` class for simpler specification of the trust and network topologies.
- Add a `LedgerOracle` class to ensure distinct ledger histories and simplify branch checking.
- Add a `Submitter` to send transactions in at fixed or random intervals to fixed or random peers.

Co-authored-by: Joseph McGee

src/test/consensus/LedgerTiming_test.cpp

@@ -95,11 +95,32 @@ class LedgerTiming_test : public beast::unit_test::suite
 
     }
 
+    void testEffCloseTime()
+    {
+        using namespace std::chrono_literals;
+        using tp = NetClock::time_point;
+        tp close = effCloseTime(tp{10s}, 30s, tp{0s});
+        BEAST_EXPECT(close == tp{1s});
+
+        close = effCloseTime(tp{16s}, 30s, tp{0s});
+        BEAST_EXPECT(close == tp{30s});
+
+        close = effCloseTime(tp{16s}, 30s, tp{30s});
+        BEAST_EXPECT(close == tp{31s});
+
+        close = effCloseTime(tp{16s}, 30s, tp{60s});
+        BEAST_EXPECT(close == tp{61s});
+
+        close = effCloseTime(tp{31s}, 30s, tp{0s});
+        BEAST_EXPECT(close == tp{30s});
+    }
+
     void
     run() override
     {
         testGetNextLedgerTimeResolution();
         testRoundCloseTime();
+        testEffCloseTime();
     }
 
 };