test: improve gettransaction test coverage

- Test gettransaction response without verbose, with verbose=False, and with verbose=True.

- In each case, test presence of expected fields in the output, including absence of the "decoded" field when `verbose` is not passed or false.

- Test that the "details" field contains the expected receive vout in each case.

Author: jonatack

test/functional/wallet_basic.py

@@ -499,10 +499,35 @@ def run_test(self):
         self.nodes[0].setlabel(change, 'foobar')
         assert_equal(self.nodes[0].getaddressinfo(change)['ischange'], False)
 
-        # Test "decoded" field value in gettransaction `verbose` response.
-        self.log.info("Testing verbose gettransaction...")
+        # Test gettransaction response with different arguments.
+        self.log.info("Testing gettransaction response with different arguments...")
+        self.nodes[0].setlabel(change, 'baz')
+        baz = self.nodes[0].listtransactions(label="baz", count=1)[0]
+        expected_receive_vout = {"label":    "baz",
+                                 "address":  baz["address"],
+                                 "amount":   baz["amount"],
+                                 "category": baz["category"],
+                                 "vout":     baz["vout"]}
+        expected_fields = frozenset({'amount', 'bip125-replaceable', 'confirmations', 'details', 'fee',
+                                     'hex', 'time', 'timereceived', 'trusted', 'txid', 'walletconflicts'})
+        verbose_field = "decoded"
+        expected_verbose_fields = expected_fields | {verbose_field}
+
+        self.log.debug("Testing gettransaction response without verbose")
+        tx = self.nodes[0].gettransaction(txid=txid)
+        assert_equal(set([*tx]), expected_fields)
+        assert_array_result(tx["details"], {"category": "receive"}, expected_receive_vout)
+
+        self.log.debug("Testing gettransaction response with verbose set to False")
+        tx = self.nodes[0].gettransaction(txid=txid, verbose=False)
+        assert_equal(set([*tx]), expected_fields)
+        assert_array_result(tx["details"], {"category": "receive"}, expected_receive_vout)
+
+        self.log.debug("Testing gettransaction response with verbose set to True")
         tx = self.nodes[0].gettransaction(txid=txid, verbose=True)
-        assert_equal(tx["decoded"], self.nodes[0].decoderawtransaction(tx["hex"]))
+        assert_equal(set([*tx]), expected_verbose_fields)
+        assert_array_result(tx["details"], {"category": "receive"}, expected_receive_vout)
+        assert_equal(tx[verbose_field], self.nodes[0].decoderawtransaction(tx["hex"]))
 
 
 if __name__ == '__main__':