[Toybox] [PATCH] file: improve test coverage.

[enh]

Use a real .class file and add tests for the other formats that file(1)
recognizes and we already have sample input in tests/files/.
---
 tests/file.test        |  27 ++++++++++++++++++++-------
 tests/files/java.class | Bin 0 -> 182 bytes
 2 files changed, 20 insertions(+), 7 deletions(-)
 create mode 100644 tests/files/java.class
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