Initial release: cd-browser v0.1.0

tests/test_ui.py

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+from pathlib import Path
+
+import pytest
+
+from app.navigator import Navigator, VisibleEntry
+from app.ui import (
+    RenderLine,
+    build_render_lines,
+    format_entry,
+    move_selection,
+    open_terminal_streams,
+)
+
+
+def test_move_selection_stays_within_bounds() -> None:
+    assert move_selection(current_index=0, step=-1, entry_count=3) == 0
+    assert move_selection(current_index=1, step=1, entry_count=3) == 2
+    assert move_selection(current_index=2, step=1, entry_count=3) == 2
+
+
+def test_format_entry_supports_parent_and_tree_indicators(tmp_path: Path) -> None:
+    parent_entry = VisibleEntry(
+        name="..",
+        path=tmp_path,
+        depth=0,
+        has_children=True,
+        is_expanded=False,
+        is_parent=True,
+    )
+    collapsed_entry = VisibleEntry(
+        name="scripts",
+        path=tmp_path / "scripts",
+        depth=0,
+        has_children=True,
+        is_expanded=False,
+    )
+    expanded_child = VisibleEntry(
+        name="build",
+        path=tmp_path / "scripts" / "build",
+        depth=1,
+        has_children=False,
+        is_expanded=False,
+    )
+
+    assert format_entry(parent_entry) == ".."
+    assert format_entry(collapsed_entry) == "▶ scripts"
+    assert format_entry(expanded_child) == "      build"
+
+
+def test_build_render_lines_marks_selected_entry(tmp_path: Path) -> None:
+    workspace = tmp_path / "workspace"
+    workspace.mkdir()
+    alpha = workspace / "alpha"
+    beta = workspace / "beta"
+    alpha.mkdir()
+    beta.mkdir()
+
+    navigator = Navigator(workspace)
+    navigator.set_selected_index(2)
+
+    assert build_render_lines(navigator) == [
+        RenderLine(text="..", is_selected=False),
+        RenderLine(text="  alpha", is_selected=False),
+        RenderLine(text="  beta", is_selected=True),
+    ]
+
+
+def test_open_terminal_streams_raises_without_terminal(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    def raise_os_error(*args: object, **kwargs: object) -> object:
+        raise OSError
+
+    monkeypatch.setattr("builtins.open", raise_os_error)
+    monkeypatch.setattr("sys.stdin.isatty", lambda: False)
+    monkeypatch.setattr("sys.stderr.isatty", lambda: False)
+
+    with pytest.raises(RuntimeError, match="Interactive terminal is required"):
+        with open_terminal_streams():
+            pass