4 files changed, 45 insertions, 0 deletions
diff --git a/tests/basics/array_add.py b/tests/basics/array_add.py
index 76ce59f761..e78615541c 100644
--- a/tests/basics/array_add.py
+++ b/tests/basics/array_add.py
@@ -14,3 +14,9 @@ print(a1)
 
 a1.extend(array.array('I', [5]))
 print(a1)
+
+a1.extend([6, 7])
+print(a1)
+
+a1.extend(i for i in (8, 9))
+print(a1)
diff --git a/tests/basics/io_buffered_writer.py b/tests/basics/io_buffered_writer.py
index 5c065f158a..60cf2c837d 100644
--- a/tests/basics/io_buffered_writer.py
+++ b/tests/basics/io_buffered_writer.py
@@ -28,3 +28,27 @@ print(bts.getvalue())
 
 # hashing a BufferedWriter
 print(type(hash(buf)))
+
+# Test failing flush()
+class MyIO(io.IOBase):
+    def __init__(self):
+        self.count = 0
+
+    def write(self, buf):
+        self.count += 1
+        if self.count < 3:
+            return None
+        print("writing", buf)
+        return len(buf)
+
+
+buf = io.BufferedWriter(MyIO(), 8)
+
+buf.write(b"foobar")
+
+for _ in range(4):
+    try:
+        buf.flush()
+        print("flushed")
+    except OSError:
+        print("OSError")
diff --git a/tests/basics/io_buffered_writer.py.exp b/tests/basics/io_buffered_writer.py.exp
index 2209348f5a..d61eb148b4 100644
--- a/tests/basics/io_buffered_writer.py.exp
+++ b/tests/basics/io_buffered_writer.py.exp
@@ -4,3 +4,8 @@ b'foobarfoobar'
 b'foobarfoobar'
 b'foo'
 <class 'int'>
+OSError
+OSError
+writing bytearray(b'foobar')
+flushed
+flushed
diff --git a/tests/basics/string_format.py b/tests/basics/string_format.py
index e8600f5836..11e7836a73 100644
--- a/tests/basics/string_format.py
+++ b/tests/basics/string_format.py
@@ -22,7 +22,17 @@ test("{:4o}", 123)
 test("{:4x}", 123)
 test("{:4X}", 123)
 
+test("{:4,d}", 1)
+test("{:4_d}", 1)
+test("{:4_o}", 1)
+test("{:4_b}", 1)
+test("{:4_x}", 1)
+
 test("{:4,d}", 12345678)
+test("{:4_d}", 12345678)
+test("{:4_o}", 12345678)
+test("{:4_b}", 12345678)
+test("{:4_x}", 12345678)
 
 test("{:#4b}", 10)
 test("{:#4o}", 123)