SubSubtable are not always in same order

[koyeung]

Tested in tag 1.0.4.

Adding the test case to rust/src/main.rs:

    #[case::subsubtable(
        indoc ! {r#"
    [project]
    [tool.coverage.paths]
    a = 1
    [tool.coverage.report]
    a = 2
    [tool.coverage.run]
    a = 3
    "#},
        indoc ! {r#"
    [project]
    classifiers = [
      "Programming Language :: Python :: 3 :: Only",
      "Programming Language :: Python :: 3.8",
    ]
    [tool.coverage.paths]
    a = 1
    [tool.coverage.report]
    a = 2
    [tool.coverage.run]
    a = 3
    "#},
        2,
        true,
        (3, 8)
    )]

Expected Result:
"tool.coverage.paths", "tool.coverage.report" and "tool.coverage.run" are sorted by the table names.

Actual Result:
The order are quite random. cargo test may pass/fail occasionally.

[gaborbernat]

PR welcome 🤗

[koyeung]

PR opened: #9

[edgarrmondragon]

This can probably be closed now