chore: import upstream snapshot with attribution

python/tests/workspace/test_cross_mount_errors.py

@@ -0,0 +1,130 @@
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ========= Copyright 2026 @ Strukto.AI All Rights Reserved. =========
+
+import asyncio
+
+from mirage.resource.ram import RAMResource
+from mirage.types import MountMode
+from mirage.workspace import Workspace
+
+
+def _make_ws():
+    ram1 = RAMResource()
+    ram2 = RAMResource()
+    ram1._store.files["/file.txt"] = b"line1\nline2\nline3\nline4\nline5\n"
+    ram2._store.files["/file.txt"] = b"aaa\nbbb\nccc\n"
+    return Workspace(
+        {
+            "/a/": (ram1, MountMode.WRITE),
+            "/b/": (ram2, MountMode.WRITE)
+        }, )
+
+
+def _run(ws, cmd):
+
+    async def _inner():
+        io = await ws.execute(cmd)
+        return await io.stdout_str(), await io.stderr_str(), io.exit_code
+
+    return asyncio.run(_inner())
+
+
+def test_cross_mount_head_invalid_n():
+    ws = _make_ws()
+    out, err, code = _run(ws, "head -n abc /a/file.txt /b/file.txt")
+    assert code == 1
+    assert "abc" in err
+
+
+def test_cross_mount_tail_invalid_n():
+    ws = _make_ws()
+    out, err, code = _run(ws, "tail -n abc /a/file.txt /b/file.txt")
+    assert code == 1
+    assert "abc" in err
+
+
+def test_cross_mount_head_valid_n():
+    ws = _make_ws()
+    out, err, code = _run(ws, "head -n 2 /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "line1" in out
+    assert "line2" in out
+    assert "aaa" in out
+    assert "bbb" in out
+
+
+def test_cross_mount_tail_valid_n():
+    ws = _make_ws()
+    out, err, code = _run(ws, "tail -n 1 /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "line5" in out
+    assert "ccc" in out
+
+
+def test_cross_mount_head_default_n():
+    ws = _make_ws()
+    out, err, code = _run(ws, "head /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "line1" in out
+    assert "aaa" in out
+
+
+def test_cross_mount_head_byte_mode():
+    ws = _make_ws()
+    out, err, code = _run(ws, "head -c 3 /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "/a/file.txt" in out
+    assert "lin" in out
+    assert "line1" not in out
+    assert "bbb" not in out
+
+
+def test_cross_mount_grep_invert():
+    ws = _make_ws()
+    out, err, code = _run(ws, "grep -v line1 /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "/a/file.txt:line2" in out
+    assert "aaa" in out
+    assert "line1" not in out
+
+
+def test_cross_mount_wc_total():
+    ws = _make_ws()
+    out, err, code = _run(ws, "wc -l /a/file.txt /b/file.txt")
+    assert code == 0
+    assert "total" in out
+    assert "5" in out
+    assert "3" in out
+    assert "8" in out
+
+
+def test_cross_mount_cat_missing_has_strerror():
+    ws = _make_ws()
+    out, err, code = _run(ws, "cat /a/file.txt /b/missing.txt")
+    assert code == 1
+    assert err == "cat: /b/missing.txt: No such file or directory\n"
+
+
+def test_cross_mount_diff_missing_has_strerror():
+    ws = _make_ws()
+    out, err, code = _run(ws, "diff /a/missing.txt /b/file.txt")
+    assert code == 1
+    assert err == "diff: /a/missing.txt: No such file or directory\n"
+
+
+def test_cross_mount_cmp_missing_has_strerror():
+    ws = _make_ws()
+    out, err, code = _run(ws, "cmp /a/file.txt /b/missing.txt")
+    assert code == 1
+    assert err == "cmp: /b/missing.txt: No such file or directory\n"