refactor integration tests (part 1)

[the-horo]

A smaller extract of #3064. I've tried to keep the old tests running so that means that the refactor would only be adding tests, and we will be left to remove the old ones at a later time when the refactor finishes. I've also tried to keep CI usable, running all of the old tests alongside the newer ones.

@Geod24 is this in the range of smaller but no so small PR, I don't expect problems if you want me to increase or decrease the number of commits per PR.

[github-actions]

✅ PR OK, no changes in deprecations or warnings

Total deprecations: 0

Total warnings: 0

Build statistics:

 statistics (-before, +after)
 executable size=5265672 bin/dub
 rough build time=61s

Full build output

DUB version 1.40.0, built on Jun  7 2025
LDC - the LLVM D compiler (1.41.0):
  based on DMD v2.111.0 and LLVM 20.1.5
  built with LDC - the LLVM D compiler (1.41.0)
  Default target: x86_64-unknown-linux-gnu
  Host CPU: znver3
  http://dlang.org - http://wiki.dlang.org/LDC


  Registered Targets:
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    aarch64_32  - AArch64 (little endian ILP32)
    aarch64_be  - AArch64 (big endian)
    amdgcn      - AMD GCN GPUs
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    x86-64      - 64-bit X86: EM64T and AMD64
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    xtensa      - Xtensa 32
   Upgrading project in /home/runner/work/dub/dub/
    Starting Performing "release" build using /opt/hostedtoolcache/dc/ldc2-1.41.0/x64/ldc2-1.41.0-linux-x86_64/bin/ldc2 for x86_64.
    Building dub 1.39.0-rc.1+commit.93.g3bde4e03: building configuration [application]
     Linking dub
STAT:statistics (-before, +after)
STAT:executable size=5265672 bin/dub
STAT:rough build time=61s

[the-horo]

ping @Geod24

[Geod24]

@the-horo : Thanks for the ping. Why are the tests under new-tests ?

[the-horo]

I understood that you want the refactoring to come in smaller batches. Since the new tests have stricter requirements (e.g. for cwd to be set the each specific test's directory) you wouldn't be able to run the newly refactored tests with the old runners. Then, I can either stop running the old testsuite and keep my changes in-place; or I put the refactored tests in a new directory and keep running the old ones.

One particularity is that it would slightly difficult, assuming the latter approach (so a new directory for the tests, just like I did), to also remove the older tests, since I would have to dig through what each test depends on, and move these graphs of tests in a single PR. Maybe it's possible or at least not that difficult.