demostrate snapshot testing

[lijunchen]

This PR demonstrates the usage of snapshot testing.

Currently, three functions are provided:

• @test.T::write(self: T, obj: Show) -> Unit: writes a showable object to T's internal buffer.
• @test.T::writeln(self: T, obj: Show) -> Unit: writes a showable object followed by a newline to T's internal buffer.
• @test.T::snapshot!(self: T, ~filename: String): writes the contents of the internal buffer to a file, which will be placed inside the __snapshot__ directory within the current package.
  • ⚠️ Ensure that the filename do not conflict with existing ones.

For example, the following test case is located in test/test_test.mbt, after running moon test -u, the it.snapshot!(filename="001.txt") call will write the buffer contents to test/__snapshot__/001.txt.

test "test snapshot testing" (it : @test.T) {
  it.write("test")
  it.write(" ")
  it.write("snapshot")
  it.write(" ")
  it.writeln("testing")
  it.write("测试")
  it.write("快照")
  it.writeln("测试")
  it.snapshot!(filename="001.txt")
}

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[coveralls]

Pull Request Test Coverage Report for Build 3069

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 83.755%

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Totals
Change from base Build 3068:	0.06%
Covered Lines:	3944
Relevant Lines:	4709

---

💛 - Coveralls

[peter-jerry-ye-code-review]

1. Incorrect Year in Copyright Notice:
   The copyright notice states "Copyright 2024," which is likely a typo or placeholder as it is beyond the current year. Ensure this is updated to the correct year or remains a placeholder until the appropriate year is reached.

2. Inconsistent File Naming:
   The filename test_test.mbt appears to be repetitive. Consider renaming it to something more descriptive or concise to avoid confusion, especially in a test directory where clarity is crucial.

3. Snapshot Filename Hardcoding:
   In the test code, the snapshot filename is hardcoded as "001.txt". This might not scale well if multiple snapshots are needed, and it could lead to overwriting issues. Consider using a dynamic or incremental naming scheme for snapshot files to prevent accidental overwrites and to manage multiple snapshots effectively.