Update unit tests for testing linux behavior

src/platform_ops.py

@@ -64,7 +64,7 @@ def open_directory(path: str) -> None:
             raise RuntimeError("xdg-open is required to open directories")
         subprocess.Popen([opener, path])
 
-# NOTE: Creates link to windows junction for torrent ?
+# NOTE: If windows,  creates ntfs junction , else , creates symlink 
 def create_directory_link(link: str, target: str) -> None:
     if sys.platform == "win32":
         flags = getattr(subprocess, "CREATE_NO_WINDOW", 0)

src/tests/test_torrent.py

@@ -45,7 +45,6 @@ def test_ensure_aria2c_returns_windows_path(monkeypatch):
 
     assert torrent.ensure_aria2c() == expected
 
-
 def test_ensure_aria2c_installs_when_not_found(monkeypatch):
     monkeypatch.setattr(
         torrent,
@@ -53,6 +52,12 @@ def test_ensure_aria2c_installs_when_not_found(monkeypatch):
         Mock(return_value=None),
     )
 
+    monkeypatch.setattr(
+        torrent.sys,
+        "platform",
+        "win32",
+    )
+
     installer = Mock(
         return_value="/fake/aria2c.exe"
     )
@@ -73,6 +78,60 @@ def test_ensure_aria2c_installs_when_not_found(monkeypatch):
         log_fn=torrent.log,
     )
 
+def test_ensure_aria2c_linux_returns_installed_binary(monkeypatch):
+    monkeypatch.setattr(
+        torrent.sys,
+        "platform",
+        "linux",
+    )
+
+    monkeypatch.setattr(
+        torrent,
+        "find_aria2c",
+        Mock(return_value="/usr/bin/aria2c"),
+    )
+
+    installer = Mock()
+
+    monkeypatch.setattr(
+        torrent,
+        "install_aria2c_windows",
+        installer,
+    )
+
+    result = torrent.ensure_aria2c()
+
+    assert result == "/usr/bin/aria2c"
+    installer.assert_not_called()
+
+def test_ensure_aria2c_linux_raises_when_not_installed(monkeypatch):
+    monkeypatch.setattr(
+        torrent.sys,
+        "platform",
+        "linux",
+    )
+
+    monkeypatch.setattr(
+        torrent,
+        "find_aria2c",
+        Mock(return_value=None),
+    )
+
+    installer = Mock()
+
+    monkeypatch.setattr(
+        torrent,
+        "install_aria2c_windows",
+        installer,
+    )
+
+    with pytest.raises(
+        RuntimeError,
+        match="aria2c required but not installed",
+    ):
+        torrent.ensure_aria2c()
+
+    installer.assert_not_called()
 
 def test_ensure_aria2c_passes_custom_logger(monkeypatch):
     monkeypatch.setattr(

src/torrent.py

@@ -6,6 +6,7 @@ import re
 import subprocess
 import threading
 import urllib.request
+import sys
 from functools import cache
 
 from .app_log import log
@@ -33,12 +34,14 @@ def ensure_aria2c(log_fn=log) -> str:
     if ARIA2C_PATH: 
         return ARIA2C_PATH
 
-    
-
-    return install_aria2c_windows( APP_DATA_DIR=APP_DATA_DIR,
+   
+    if sys.platform.startswith == "win": 
+        return install_aria2c_windows( APP_DATA_DIR=APP_DATA_DIR,
                                                ALLOWED_DOWNLOAD_HOSTS=ALLOWED_DOWNLOAD_HOSTS,
                                                log_fn=log_fn)
 
+    raise RuntimeError("aria2c required but not installed")
+
 
 def _bdecode(buf: bytes, pos: int = 0):
     """Minimal bencode decoder → (value, next_pos). Strings stay bytes."""