Merge bitcoin#23086: test: Add -testactivationheight tests to rpc_blockchain

fa4ca8d test: Add -testactivationheight tests to rpc_blockchain (MarcoFalke)

Pull request description:

  Suggested: bitcoin#22818 (comment)

ACKs for top commit:
  laanwj:
    Code review ACK fa4ca8d
  theStack:
    Concept and code-review ACK fa4ca8d

Tree-SHA512: 41304db1a15c0c705a9cc2808c9f1d7831a321a8a7948a28ec5d3ee1ed3da6a0ce67cd50c99a33aaed86830c59608eb6ffadbeaba67d95245c490f9b6c277912

Author: merge-script

test/functional/rpc_blockchain.py

@@ -127,7 +127,29 @@ def _test_getblockchaininfo(self):
         # should have exact keys
         assert_equal(sorted(res.keys()), keys)
 
-        self.restart_node(0, ['-stopatheight=207', '-prune=550'])
+        self.stop_node(0)
+        self.nodes[0].assert_start_raises_init_error(
+            extra_args=['-testactivationheight=name@2'],
+            expected_msg='Error: Invalid name (name@2) for -testactivationheight=name@height.',
+        )
+        self.nodes[0].assert_start_raises_init_error(
+            extra_args=['-testactivationheight=bip34@-2'],
+            expected_msg='Error: Invalid height value (bip34@-2) for -testactivationheight=name@height.',
+        )
+        self.nodes[0].assert_start_raises_init_error(
+            extra_args=['-testactivationheight='],
+            expected_msg='Error: Invalid format () for -testactivationheight=name@height.',
+        )
+        self.start_node(0, extra_args=[
+            '-stopatheight=207',
+            '-prune=550',
+            '-testactivationheight=bip34@2',
+            '-testactivationheight=dersig@3',
+            '-testactivationheight=cltv@4',
+            '-testactivationheight=csv@5',
+            '-testactivationheight=segwit@6',
+        ])
+
         res = self.nodes[0].getblockchaininfo()
         # result should have these additional pruning keys if prune=550
         assert_equal(sorted(res.keys()), sorted(['pruneheight', 'automatic_pruning', 'prune_target_size'] + keys))
@@ -140,11 +162,11 @@ def _test_getblockchaininfo(self):
         assert_greater_than(res['size_on_disk'], 0)
 
         assert_equal(res['softforks'], {
-            'bip34': {'type': 'buried', 'active': True, 'height': 1},
-            'bip66': {'type': 'buried', 'active': True, 'height': 1},
-            'bip65': {'type': 'buried', 'active': True, 'height': 1},
-            'csv': {'type': 'buried', 'active': True, 'height': 1},
-            'segwit': {'type': 'buried', 'active': True, 'height': 1},
+            'bip34': {'type': 'buried', 'active': True, 'height': 2},
+            'bip66': {'type': 'buried', 'active': True, 'height': 3},
+            'bip65': {'type': 'buried', 'active': True, 'height': 4},
+            'csv': {'type': 'buried', 'active': True, 'height': 5},
+            'segwit': {'type': 'buried', 'active': True, 'height': 6},
             'testdummy': {
                 'type': 'bip9',
                 'bip9': {