test variant to exclude dot-files/dirs by default

tests/testsuite/package.rs

@@ -1422,3 +1422,26 @@ fn gitignore_negate() {
          ",
     );
 }
+
+#[cargo_test]
+fn exclude_dot_files_and_directories_by_default() {
+    include_exclude_test(
+        "[]",
+        "[]",
+        &["src/lib.rs", ".dotfile", ".dotdir/file"],
+        "Cargo.toml\n\
+         src/lib.rs\n\
+         ",
+    );
+
+    include_exclude_test(
+        r#"["Cargo.toml", "src/lib.rs", ".dotfile", ".dotdir/file"]"#,
+        "[]",
+        &["src/lib.rs", ".dotfile", ".dotdir/file"],
+        ".dotdir/file\n\
+         .dotfile\n\
+         Cargo.toml\n\
+         src/lib.rs\n\
+         ",
+    );
+}