test(_filedir): Test files that start with ".."

These types of files are used by the go kubernetes atomic writer [0], and presumably other types of systems, and we want to make sure they will be completed correctly. [0] https://pkg.go.dev/k8s.io/kubernetes/pkg/volume/util#AtomicWriter.Write
scop · Nov 1, 2024 · 88894da · 88894da
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diff --git a/test/fixtures/_filedir/dotdot/..2016_02_01_15_04_05.123456 b/test/fixtures/_filedir/dotdot/..2016_02_01_15_04_05.123456
diff --git a/test/fixtures/_filedir/dotdot/..data b/test/fixtures/_filedir/dotdot/..data
@@ -0,0 +1 @@
+..2016_02_01_15_04_05.123456
diff --git a/test/fixtures/_filedir/dotdot/..folder/.nothing_here b/test/fixtures/_filedir/dotdot/..folder/.nothing_here
diff --git a/test/t/unit/test_unit_compgen_filedir.py b/test/t/unit/test_unit_compgen_filedir.py
@@ -259,3 +259,16 @@ def test_28_dot_4(self, bash, functions, funcname):
         """Include . when the completion is attempted for '..[TAB]'"""
         completion = assert_complete(bash, r"%s _filedir/.." % funcname)
         assert completion == "/"
+
+    @pytest.mark.parametrize("funcname", "f f2".split())
+    def test_29_dotdot(self, bash, functions, funcname):
+        """Complete files starting with .."""
+        completion = assert_complete(
+            bash, r"%s .." % funcname, cwd="_filedir/dotdot/"
+        )
+        assert completion == [
+            "../",
+            "..2016_02_01_15_04_05.123456",
+            "..data",
+            "..folder/",
+        ]