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Re-enabling native-comp surfaced a suite-wide fragility. When a test redefines a C primitive (or a native-compiled function), native-comp routes native callers through a trampoline that calls the mock with the primitive's maximum arity. A fixed-arity mock narrower than the primitive then throws wrong-number-of-arguments, intermittently, as the eln-cache fills.
I swept every arity-narrow subr mock to append &rest _ (188 sites, preserving any named args the body uses), and added tests/test-meta-subr-mock-arity.el, which fails make test on any subr mock too narrow for the primitive's arity. The rule isn't "never mock a subr". The suite mocks message and completing-read freely. It's "a subr mock must accept the primitive's arity."
Background, the three failure modes, and the research are in docs/native-comp-subr-mocking.org.
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The X11 video path and the audio path interpolated the mic device, system device, and output filename straight into the shell command, so a device name or recording directory with a space (or other shell metacharacter) would break the command or mishandle the path. The Wayland video branch already quoted these; the other two did not.
I wrapped all three in shell-quote-argument on both paths. To make the audio command testable, I extracted it into cj/recording--build-audio-command mirroring the existing cj/recording--build-video-command, then quoted there. Tests cover device names and filenames with spaces on both the X11 and audio builders.
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Cover build-video-command (9 tests), select-from-labeled (5 tests),
and test-device (4 tests). All three were previously tested only
indirectly through their callers.
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