fix: missing changes from Merge #16917: tests: Move common function assert_approx() into util.py

96299a9d6c0a6b9125a58a63ee3147e55d1b086b Test: Move common function assert_approx() into util.py (fridokus)

Pull request description:

  To reduce code duplication, move `assert_approx` into common framework `util.py`.

  `assert_approx()` is used in two functional tests.

ACKs for top commit:
  theStack:
    ACK 96299a9
  practicalswift:
    ACK 96299a9d6c0a6b9125a58a63ee3147e55d1b086b -- DRY is good and diff looks correct
  fanquake:
    ACK 96299a9d6c0a6b9125a58a63ee3147e55d1b086b - thanks for contributing 🍻

Tree-SHA512: 8e9d397222c49536c7b3d6d0756cc5af17113e5af8707ac48a500fff1811167fb2e03f3c0445b0b9e80f34935f4d57cfb935c4790f6f5463a32a67df5f736939

test/functional/wallet_avoidreuse.py

@@ -6,17 +6,11 @@
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
+    assert_approx,
     assert_equal,
     assert_raises_rpc_error,
 )
 
-# TODO: Copied from wallet_groups.py -- should perhaps move into util.py
-def assert_approx(v, vexp, vspan=0.00001):
-    if v < vexp - vspan:
-        raise AssertionError("%s < [%s..%s]" % (str(v), str(vexp - vspan), str(vexp + vspan)))
-    if v > vexp + vspan:
-        raise AssertionError("%s > [%s..%s]" % (str(v), str(vexp - vspan), str(vexp + vspan)))
-
 def reset_balance(node, discardaddr):
     '''Throw away all owned coins by the node so it gets a balance of 0.'''
     balance = node.getbalance(avoid_reuse=False)

test/functional/wallet_groups.py

@@ -12,7 +12,6 @@ from test_framework.util import (
     assert_equal,
 )
 
-
 class WalletGroupTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True