As of pre-master-47 git head
https://sourceforge.net/p/ngspice/ngspice/ci/21b3131e12f0f43102105ea6b9ffd2f99714b953/
make check fails like
make check-TESTS
make[3]: Entering directory '/builddir/build/BUILD/ngspice-46_20260418git21b3131-build/ngspice-46-20260418git21b3131/ngspice/tests/regression/misc'
make[3]: *** No rule to make target 'convergence.cir', needed by 'check-TESTS'. Stop.
make[3]: Leaving directory '/builddir/build/BUILD/ngspice-46_20260418git21b3131-build/ngspice-46-20260418git21b3131/ngspice/tests/regression/misc'
make[2]: *** [Makefile:498: check-am] Error 2
make[2]: Leaving directory '/builddir/build/BUILD/ngspice-46_20260418git21b3131-build/ngspice-46-20260418git21b3131/ngspice/tests/regression/misc'
make[1]: *** [Makefile:403: check-recursive] Error 1
make[1]: Leaving directory '/builddir/build/BUILD/ngspice-46_20260418git21b3131-build/ngspice-46-20260418git21b3131/ngspice/tests/regression'
make: *** [Makefile:451: check-recursive] Error 1
Perhaps simply because the needed convergence.cir is not added to git repository.
Indeed, it is an effect of integrating Patch 121 (commit 0638aaa160). The file was not included in the patch. To fix, remove the file name from tests/regression/misc/Makefile.am. Thank you for the report.
Fixed in pre-master-47.