             return
         }
 
+        XCTAssertEqual(try TarContainer.formatOf(container: testData), .pax)
+
         let entries = try TarContainer.open(container: testData)
 
         XCTAssertEqual(entries.count, 1)

            return
        }

        let entries = try TarContainer.open(container: testData)

        XCTAssertEqual(entries.count, 1)

            XCTFail("Unable to get test data.")
            return
        }

        XCTAssertEqual(try TarContainer.formatOf(container: testData), .gnu)

        let entries = try TarContainer.open(container: testData)

