diff --git a/test/espnet2/bin/test_st_inference.py b/test/espnet2/bin/test_st_inference.py
new file mode 100644
index 00000000000..7abc3c6ef7d
--- /dev/null
+++ b/test/espnet2/bin/test_st_inference.py
@@ -0,0 +1,79 @@
+from argparse import ArgumentParser
+from pathlib import Path
+import string
+
+import numpy as np
+import pytest
+
+from espnet.nets.beam_search import Hypothesis
+from espnet2.bin.st_inference import get_parser
+from espnet2.bin.st_inference import main
+from espnet2.bin.st_inference import Speech2Text
+from espnet2.tasks.st import STTask
+
+
+def test_get_parser():
+    assert isinstance(get_parser(), ArgumentParser)
+
+
+def test_main():
+    with pytest.raises(SystemExit):
+        main()
+
+
+@pytest.fixture()
+def token_list(tmp_path: Path):
+    with (tmp_path / "tokens.txt").open("w") as f:
+        f.write("<blank>\n")
+        for c in string.ascii_letters:
+            f.write(f"{c}\n")
+        f.write("<unk>\n")
+        f.write("<sos/eos>\n")
+    return tmp_path / "tokens.txt"
+
+
+@pytest.fixture()
+def src_token_list(tmp_path: Path):
+    with (tmp_path / "src_tokens.txt").open("w") as f:
+        f.write("<blank>\n")
+        for c in string.ascii_letters:
+            f.write(f"{c}\n")
+        f.write("<unk>\n")
+        f.write("<sos/eos>\n")
+    return tmp_path / "src_tokens.txt"
+
+
+@pytest.fixture()
+def st_config_file(tmp_path: Path, token_list, src_token_list):
+    # Write default configuration file
+    STTask.main(
+        cmd=[
+            "--dry_run",
+            "true",
+            "--output_dir",
+            str(tmp_path / "st"),
+            "--token_list",
+            str(token_list),
+            "--src_token_list",
+            str(src_token_list),
+            "--token_type",
+            "char",
+        ]
+    )
+    return tmp_path / "st" / "config.yaml"
+
+
+@pytest.mark.execution_timeout(5)
+def test_Speech2Text(st_config_file):
+    speech2text = Speech2Text(
+        st_train_config=st_config_file, beam_size=1
+    )
+    speech = np.random.randn(1000)
+    results = speech2text(speech)
+    for text, token, token_int, hyp in results:
+        assert isinstance(text, str)
+        assert isinstance(token[0], str)
+        assert isinstance(token_int[0], int)
+        assert isinstance(hyp, Hypothesis)
+
+
diff --git a/test/espnet2/bin/test_st_train.py b/test/espnet2/bin/test_st_train.py
new file mode 100644
index 00000000000..5be899f0a38
--- /dev/null
+++ b/test/espnet2/bin/test_st_train.py
@@ -0,0 +1,15 @@
+from argparse import ArgumentParser
+
+import pytest
+
+from espnet2.bin.st_train import get_parser
+from espnet2.bin.st_train import main
+
+
+def test_get_parser():
+    assert isinstance(get_parser(), ArgumentParser)
+
+
+def test_main():
+    with pytest.raises(SystemExit):
+        main()