Check stderr when testing bitcoin-tx

Github-Pull: #10130
Rebased-From: 21704f6334

src/test/bctest.py

@@ -98,6 +98,18 @@ def bctest(testDir, testObj, exeext):
         logging.error("Return code mismatch for " + outputFn)
         raise Exception
 
+    if "error_txt" in testObj:
+        want_error = testObj["error_txt"]
+        # Compare error text
+        # TODO: ideally, we'd compare the strings exactly and also assert
+        # That stderr is empty if no errors are expected. However, bitcoin-tx
+        # emits DISPLAY errors when running as a windows application on
+        # linux through wine. Just assert that the expected error text appears
+        # somewhere in stderr.
+        if want_error not in outs[1]:
+            logging.error("Error mismatch:\n" + "Expected: " + want_error + "\nReceived: " + outs[1].rstrip())
+            raise Exception
+
 def bctester(testDir, input_basename, buildenv):
     """ Loads and parses the input file, runs all tests and reports results"""
     input_filename = testDir + "/" + input_basename

src/test/data/bitcoin-util-test.json

@@ -42,6 +42,7 @@
     "args": ["-", "delin=31"],
     "input": "tx394b54bb.hex",
     "return_code": 1,
+    "error_txt": "error: Invalid TX input index '31'",
     "description": "Attempts to delete an input with a bad index from a transaction. Expected to fail."
   },
   { "exec": "./bitcoin-tx",
@@ -60,6 +61,7 @@
     "args": ["-", "delout=2"],
     "input": "tx394b54bb.hex",
     "return_code": 1,
+    "error_txt": "error: Invalid TX output index '2'",
     "description": "Attempts to delete an output with a bad index from a transaction. Expected to fail."
   },
   { "exec": "./bitcoin-tx",
@@ -233,6 +235,7 @@
      "in=5897de6bd6027a475eadd57019d4e6872c396d0716c4875a5f1a6fcfdf385c1f:0",
      "outdata=4:badhexdata"],
     "return_code": 1,
+    "error_txt": "error: invalid TX output data",
     "description": "Attempts to create a new transaction with one input and an output with malformed hex data. Expected to fail"
   },
   { "exec": "./bitcoin-tx",
@@ -241,6 +244,7 @@
      "in=5897de6bd6027a475eadd57019d4e6872c396d0716c4875a5f1a6fcfdf385c1f:0",
      "outdata=badhexdata"],
     "return_code": 1,
+    "error_txt": "error: invalid TX output data",
     "description": "Attempts to create a new transaction with one input and an output with no value and malformed hex data. Expected to fail"
   },
   { "exec": "./bitcoin-tx",