Close test annotation files

Author: cbrnr

tests/test_annotation.py

@@ -33,7 +33,8 @@ def test_1(self):
         # no null to detect in the output text file of rdann.
 
         # Target data from WFDB software package
-        lines = tuple(open("tests/target-output/ann-1", "r"))
+        with open("tests/target-output/ann-1", "r") as f:
+            lines = tuple(f)
         nannot = len(lines)
 
         target_time = [None] * nannot
@@ -108,7 +109,8 @@ def test_2(self):
         annotation = wfdb.rdann("sample-data/12726", "anI")
 
         # Target data from WFDB software package
-        lines = tuple(open("tests/target-output/ann-2", "r"))
+        with open("tests/target-output/ann-2", "r") as f:
+            lines = tuple(f)
         nannot = len(lines)
 
         target_time = [None] * nannot
@@ -181,7 +183,8 @@ def test_3(self):
         annotation = wfdb.rdann("sample-data/1003", "atr")
 
         # Target data from WFDB software package
-        lines = tuple(open("tests/target-output/ann-3", "r"))
+        with open("tests/target-output/ann-3", "r") as f:
+            lines = tuple(f)
         nannot = len(lines)
 
         target_time = [None] * nannot