Test trust() on native SAC

Author: sisuresh

src/transactions/test/InvokeHostFunctionTests.cpp

@@ -505,6 +505,9 @@ TEST_CASE("Native stellar asset contract",
             REQUIRE(entry.current().data.account().balance == createAmount);
         }
 
+        // Calling trust on the native asset should fail
+        REQUIRE(!client.trust(a2));
+
         // Transferring below minimum should fail for a non-existent account
         auto newAccKey2 = SecretKey::pseudoRandomForTesting();
         auto newAccPub2 = newAccKey2.getPublicKey();

src/transactions/test/SorobanTxTestUtils.cpp

@@ -1990,9 +1990,15 @@ AssetContractTestClient::trust(TestAccount& addr)
     LedgerKey accountKey(ACCOUNT);
     accountKey.account().accountID = addr.getPublicKey();
 
-    auto spec = defaultSpec()
-                    .setReadWriteFootprint({trustlineKey, accountKey})
-                    .extendReadOnlyFootprint({makeIssuerKey(mAsset)});
+    auto spec = defaultSpec();
+    // If this is the native asset, we expect the tx to fail, but we still want
+    // to be able to test that failure, so make sure the tx that is built passes
+    // initial validation.
+    if (mAsset.type() != ASSET_TYPE_NATIVE)
+    {
+        spec = spec.setReadWriteFootprint({trustlineKey, accountKey})
+                   .extendReadOnlyFootprint({makeIssuerKey(mAsset)});
+    }
 
     auto invocation = mContract.prepareInvocation("trust", {addrVal}, spec)
                           .withAuthorizedTopCall();

test-tx-meta-baseline-next/InvokeHostFunctionTests.json

@@ -51,11 +51,11 @@
 	[
 		"+cR3oq2qY0I=",
 		"v/UMJBmXfpU=",
-		"85yMEwwwc2M=",
-		"a1q2UiYASYk=",
-		"eoffsMU55dU=",
-		"7oyuQYJsb0E=",
-		"4P+9B/v0HWY="
+		"c5hMI0Elm+M=",
+		"Hy46FpEBO/4=",
+		"Y47MsGv0nS8=",
+		"VW84T3660GI=",
+		"15WZmVivTk4="
 	],
 	"Soroban authorization" : 
 	[