Currently the default JVM comes on most platforms with 4 jsa files (for coops/nocoops and with and without compressed object headers).
See also :

https://github.com/openjdk/jdk/blob/master/make/Images.gmk#L195C1-L213C6

ifeq ($(BUILD_CDS_ARCHIVE), true)
  $(foreach v, $(JVM_VARIANTS), \
    $(eval $(call CreateCDSArchive,$v,)) \
  )

  ifeq ($(call isTargetCpuBits, 64), true)
    $(foreach v, $(JVM_VARIANTS), \
      $(eval $(call CreateCDSArchive,$v,_nocoops)) \
    )
    ifeq ($(BUILD_CDS_ARCHIVE_COH), true)
      $(foreach v, $(JVM_VARIANTS), \
        $(eval $(call CreateCDSArchive,$v,_coh)) \
      )
      $(foreach v, $(JVM_VARIANTS), \
        $(eval $(call CreateCDSArchive,$v,_nocoops_coh)) \
      )
    endif
  endif
endif


But there might be cases where the number of jsa files is reduced (see for example BUILD_CDS_ARCHIVE_COH).
The (jtreg) tests coming with the codebase should still work in case a JVM has reduced numbers of jsa files.
But for some tests this is currently not the case.
Examples:

test/hotspot/jtreg/runtime/CompressedOops/CompressedCPUSpecificClassSpaceReservation.java
test/hotspot/jtreg/runtime/cds/TestDefaultArchiveLoading.java
test/hotspot/jtreg/runtime/cds/appcds/loaderConstraints/DynamicLoaderConstraintsTest.java (custom-cl-zgc)

Maybe we could add a new @requires tag for these tests?
Or somehow check that all jsa archives are present?