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-rw-r--r--test/functional/test_framework/util.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 3175872b00..1c254b6755 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -25,6 +25,13 @@ logger = logging.getLogger("TestFramework.utils")
# Assert functions
##################
+def assert_approx(v, vexp, vspan=0.00001):
+ """Assert that `v` is within `vspan` of `vexp`"""
+ 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 assert_fee_amount(fee, tx_size, fee_per_kB):
"""Assert the fee was in range"""
target_fee = round(tx_size * fee_per_kB / 1000, 8)