/usr/local/src/BUILD/x86_64-linux/tcltls-2.0b1> make test
TCL_LIBRARY=`echo /usr/local/src/SOURCES/tcl8.5.19/library` LD_LIBRARY_PATH="/usr/local/src/BUILD/x86_64-linux/tcltls-2.0b1:/usr/local/src/BUILD/x86_64-linux/tcl8.5:" PATH="/usr/local/src/BUILD/x86_64-linux/tcltls-2.0b1:/usr/local/src/BUILD/x86_64-linux/tcl8.5:/home/erik/bin:/usr/local/bin:/usr/bin:/bin" TCLLIBPATH="/usr/local/src/BUILD/x86_64-linux/tcltls-2.0b1" /usr/local/src/BUILD/x86_64-linux/tcl8.5/tclsh `echo ../../../SOURCES/tcltls-2.0b1/tests/all.tcl`  \
    -load "package ifneeded tls 2.0b1 \
        [list load `echo libtls2.0b1.so` [string totitle tls]]"
invalid command name "::tls::protocols"
    while executing
"::tls::protocols"
    invoked from within
"foreach protocol [::tls::protocols] {
    ::tcltest::testConstraint $protocol 1
    ::tcltest::testConstraint !$protocol 0
}"
    (file "/usr/local/src/SOURCES/tcltls-2.0b1/tests/common.tcl" line 13)
    invoked from within
"source -encoding utf-8 [file join $path common.tcl]"
    invoked from within
"if {[file exists [file join $path common.tcl]]} {
    source -encoding utf-8 [file join $path common.tcl]
}"
    (file "../../../SOURCES/tcltls-2.0b1/tests/all.tcl" line 21)
make: *** [Makefile:295: test] Error 1

Fixed in [8019cf96ed3346b6]. The issue since this is a beta release, a 'package prefer latest' is needed or an older version could be used.