Fix tx re-ordering bug in test:

`env.fund` requires two transactions: `pay` and `set account`. If there is a
`trust` transaction in the same set of txs, the txs may be reordered so
`pay` -> `trust` -> `set account` so the wrong `no ripple` flag would be used
on the trust line.

Adding a `close` between `env.fund` and `env.trust` resolves this problem.

src/test/app/Flow_test.cpp

@@ -31,6 +31,20 @@
 namespace ripple {
 namespace test {
 
+bool getNoRippleFlag (jtx::Env const& env,
+    jtx::Account const& src,
+    jtx::Account const& dst,
+    Currency const& cur)
+{
+    if (auto sle = env.le (keylet::line (src, dst, cur)))
+    {
+        auto const flag = (src.id() > dst.id()) ? lsfHighNoRipple : lsfLowNoRipple;
+        return sle->isFlag (flag);
+    }
+    Throw<std::runtime_error> ("No line in getTrustFlag");
+    return false; // silence warning
+}
+
 jtx::PrettyAmount
 xrpMinusFee (jtx::Env const& env, std::int64_t xrpAmount)
 {
@@ -1046,9 +1060,16 @@ struct Flow_test : public beast::unit_test::suite
         auto const bob = Account("bob");
         auto const gw = Account("gw");
         auto const USD = gw["USD"];
+        auto const usdC = USD.currency;
 
         env.fund(XRP(10000), alice, bob, gw);
+        // Need to be past this time to see the bug
+        env.close(amendmentRIPD1274SoTime() +
+            100 * env.closed()->info().closeTimeResolution);
         env(trust(alice, USD(100)));
+        env.close();
+
+        BEAST_EXPECT(!getNoRippleFlag(env, gw, alice, usdC));
 
         env(pay(
             gw, alice,
@@ -1079,10 +1100,6 @@ struct Flow_test : public beast::unit_test::suite
                 USD.issue(), std::uint64_t(1700000000000000ull), -14, false},
             XRP(.001)));
 
-        // Need to be past this time to see the bug
-        env.close(amendmentRIPD1274SoTime() +
-            100 * env.closed()->info().closeTimeResolution);
-
         env(pay(alice, bob, XRP(10000)), path(~XRP), sendmax(USD(100)),
             txflags(tfPartialPayment | tfNoRippleDirect));
     }

src/test/app/PayStrand_test.cpp

@@ -44,12 +44,11 @@ struct XRPEndpointStepInfo
     AccountID acc;
 };
 
-enum class TrustFlag { freeze, auth };
+enum class TrustFlag {freeze, auth, noripple};
 
-std::uint32_t
+/*constexpr*/ std::uint32_t trustFlag (TrustFlag f, bool useHigh)
-trustFlag(TrustFlag f, bool useHigh)
 {
-    switch (f)
+    switch(f)
     {
         case TrustFlag::freeze:
             if (useHigh)
@@ -59,8 +58,12 @@ trustFlag(TrustFlag f, bool useHigh)
             if (useHigh)
                 return lsfHighAuth;
             return lsfLowAuth;
+        case TrustFlag::noripple:
+            if (useHigh)
+                return lsfHighNoRipple;
+            return lsfLowNoRipple;
     }
-    return 0;  // Silence warning about end of non-void function
+    return 0; // Silence warning about end of non-void function
 }
 
 bool