1 files changed, 60 insertions, 0 deletions
diff --git a/cli/internal/fs/fs_test.go b/cli/internal/fs/fs_test.go
new file mode 100644
index 0000000..0598d43
--- /dev/null
+++ b/cli/internal/fs/fs_test.go
@@ -0,0 +1,60 @@
+package fs
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func Test_DirContainsPath(t *testing.T) {
+	parent, err := filepath.Abs(filepath.Join("some", "path"))
+	if err != nil {
+		t.Fatalf("failed to construct parent path %v", err)
+	}
+	testcases := []struct {
+		target []string
+		want   bool
+	}{
+		{
+			[]string{"..", "elsewhere"},
+			false,
+		},
+		{
+			[]string{"sibling"},
+			false,
+		},
+		{
+			// The same path as parent
+			[]string{"some", "path"},
+			true,
+		},
+		{
+			[]string{"some", "path", "..", "path", "inside", "parent"},
+			true,
+		},
+		{
+			[]string{"some", "path", "inside", "..", "inside", "parent"},
+			true,
+		},
+		{
+			[]string{"some", "path", "inside", "..", "..", "outside", "parent"},
+			false,
+		},
+		{
+			[]string{"some", "pathprefix"},
+			false,
+		},
+	}
+	for _, tc := range testcases {
+		target, err := filepath.Abs(filepath.Join(tc.target...))
+		if err != nil {
+			t.Fatalf("failed to construct path for %v: %v", tc.target, err)
+		}
+		got, err := DirContainsPath(parent, target)
+		if err != nil {
+			t.Fatalf("failed to check ")
+		}
+		if got != tc.want {
+			t.Errorf("DirContainsPath(%v, %v) got %v, want %v", parent, target, got, tc.want)
+		}
+	}
+}