ui: migrate cache:dir and check-ignore to ui.write (#6021)

tests/unit/command/test_cache.py

@@ -0,0 +1,28 @@
+import os
+import textwrap
+
+from dvc.main import main
+
+
+def test_cache_dir_local(tmp_dir, dvc, capsys, caplog):
+    (tmp_dir / ".dvc" / "config.local").write_text(
+        textwrap.dedent(
+            """\
+            [cache]
+                dir = some/path
+            """
+        )
+    )
+    path = os.path.join(dvc.dvc_dir, "some", "path")
+
+    assert main(["cache", "dir", "--local"]) == 0
+
+    out, _ = capsys.readouterr()
+    assert path in out
+
+    assert main(["cache", "dir"]) == 0
+    out, _ = capsys.readouterr()
+    assert path in out
+
+    assert main(["cache", "dir", "--project"]) == 251
+    assert "option 'dir' doesn't exist in section 'cache'" in caplog.text