1 files changed, 54 insertions, 0 deletions
diff --git a/tests/pty_test.py b/tests/pty_test.py
new file mode 100644
index 0000000..0f309c7
--- /dev/null
+++ b/tests/pty_test.py
@@ -0,0 +1,54 @@
+import os
+import pty
+from typing import Any, List, Union
+
+import asciinema.pty_
+
+from .test_helper import Test
+
+
+class Writer:
+    def __init__(self) -> None:
+        self.data: List[Union[float, str]] = []
+
+    def write_stdout(self, _ts: float, data: Any) -> None:
+        self.data.append(data)
+
+    def write_stdin(self, ts: float, data: Any) -> None:
+        raise NotImplementedError
+
+
+class TestRecord(Test):
+    def setUp(self) -> None:
+        self.real_os_write = os.write
+        os.write = self.os_write  # type: ignore
+
+    def tearDown(self) -> None:
+        os.write = self.real_os_write
+
+    def os_write(self, fd: int, data: Any) -> None:
+        if fd != pty.STDOUT_FILENO:
+            self.real_os_write(fd, data)
+
+    @staticmethod
+    def test_record_command_writes_to_stdout() -> None:
+        writer = Writer()
+
+        command = [
+            "python3",
+            "-c",
+            (
+                "import sys"
+                "; import time"
+                "; sys.stdout.write('foo')"
+                "; sys.stdout.flush()"
+                "; time.sleep(0.01)"
+                "; sys.stdout.write('bar')"
+            ),
+        ]
+
+        asciinema.pty_.record(
+            command, {}, writer, lambda: (80, 24), lambda s: None, {}
+        )
+
+        assert writer.data == [b"foo", b"bar"]