diff -Nur zstd-1.5.0/tests/playTests.sh new-zstd/tests/playTests.sh
--- zstd-1.5.0/tests/playTests.sh	2021-05-14 22:59:34.000000000 +0800
+++ new-zstd/tests/playTests.sh	2021-12-03 11:21:43.067003307 +0800
@@ -176,10 +176,15 @@
 
 
 println "\n===>  simple tests "
-
+zstd -h
+zstd -H
+zstd -V
 datagen > tmp
 println "test : basic compression "
 zstd -f tmp                      # trivial compression case, creates tmp.zst
+zstd -f -z tmp                      # trivial compression case, creates tmp.zst
+zstd -f -k tmp                      # trivial compression case, creates tmp.zst
+zstd -f -C tmp                      # trivial compression case, creates tmp.zst
 println "test : basic decompression"
 zstd -df tmp.zst                 # trivial decompression case (overwrites tmp)
 println "test : too large compression level => auto-fix"
@@ -188,6 +193,7 @@
 println "test : --fast aka negative compression levels"
 zstd --fast -f tmp  # == -1
 zstd --fast=3 -f tmp  # == -3
+zstd --fast3 -f tmp  && die "Invalid charcter following --fast"
 zstd --fast=200000 -f tmp  # too low compression level, automatic fixed
 zstd --fast=5000000000 -f tmp && die "too large numeric value : must fail"
 zstd -c --fast=0 tmp > $INTOVOID && die "--fast must not accept value 0"
@@ -719,6 +725,7 @@
 println "test : show-default-cparams regular"
 datagen > tmp
 zstd --show-default-cparams -f tmp
+zstd --show-default-cparams -d tmp.zst && die "can't use --show-default-cparams in decompression mode"
 rm -rf tmp*
 
 println "test : show-default-cparams recursive"
@@ -757,6 +764,7 @@
 cat hello.tmp world.tmp > helloworld.tmp
 zstd -c hello.tmp > hello.zst
 zstd -c world.tmp > world.zst
+zstd -c hello.tmp world.tmp > helloworld.zst
 cat hello.zst world.zst > helloworld.zst
 zstd -dc helloworld.zst > result.tmp
 cat result.tmp
@@ -909,7 +917,13 @@
 cat tmp | zstd -14 -f --size-hint=10950 | zstd -t  # slightly too low
 cat tmp | zstd -14 -f --size-hint=22000 | zstd -t  # considerably too high
 cat tmp | zstd -14 -f --size-hint=5500  | zstd -t  # considerably too low
-
+println "test : allows and interprets K, KB, KiB, M, MB amd MiB suffix"
+cat tmp | zstd -14 -f --size-hint=11K | zstd -t  # slightly too high
+cat tmp | zstd -14 -f --size-hint=11KB | zstd -t 
+cat tmp | zstd -14 -f --size-hint=11KiB | zstd -t 
+cat tmp | zstd -14 -f --size-hint=1M  | zstd -t  
+cat tmp | zstd -14 -f --size-hint=1MB | zstd -t  
+cat tmp | zstd -14 -f --size-hint=1MiB  | zstd -t  
 
 println "\n===>  dictionary tests "
 
@@ -1014,6 +1028,7 @@
 zstd --train-fastcover=steps=1,shrink "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpShrinkDict
 zstd --train-fastcover=steps=1,shrink=1 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpShrinkDict1
 zstd --train-fastcover=steps=1,shrink=5 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpShrinkDict2
+zstd --train-fastcover=shrink=5,steps=1 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpShrinkDict3
 println "- Create dictionary with size limit"
 zstd --train-fastcover=steps=1 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpDict2 --maxdict=4K
 println "- Create dictionary using all samples for both training and testing"
@@ -1514,6 +1529,7 @@
 then
     println "\n===>   adaptive mode "
     roundTripTest -g270000000 " --adapt"
+    roundTripTest -g270000000 " --adapt=" && die "invalid compression parameter"
     roundTripTest -g27000000 " --adapt=min=1,max=4"
     println "===>   test: --adapt must fail on incoherent bounds "
     datagen > tmp
@@ -1557,6 +1573,7 @@
 datagen -g550000000 -P0 > tmp_dict
 datagen -g100000000 -P1 > tmp_patch
 zstd --long=30 -1f --patch-from tmp_dict tmp_patch
+zstd --long30 -1f --patch-from tmp_dict tmp_patch && die "invalid character fllowing --long"
 zstd --long=30 -df --patch-from tmp_dict tmp_patch.zst -o tmp_patch_recon
 $DIFF -s tmp_patch_recon tmp_patch
 rm -rf tmp*
@@ -1630,11 +1647,13 @@
 println "\n===>  cover dictionary builder : advanced options "
 
 TESTFILE="$PRGDIR"/zstdcli.c
+datagen
 datagen > tmpDict
 println "- Create first dictionary"
 zstd --train-cover=k=46,d=8,split=80 "$TESTDIR"/*.c "$PRGDIR"/*.c -o tmpDict
 cp "$TESTFILE" tmp
 zstd -f tmp -D tmpDict
+zstd -f tmp -D tmpDict --patch-from=tmpDict && die "can't use -D and --patch-from=# at the same time"
 zstd -d tmp.zst -D tmpDict -fo result
 $DIFF "$TESTFILE" result
 zstd --train-cover=k=56,d=8 && die "Create dictionary without input file (should error)"
@@ -1645,6 +1664,7 @@
 zstd --train-cover=steps=256,shrink "$TESTDIR"/*.c "$PRGDIR"/*.c --dictID=1 -o tmpShrinkDict
 zstd --train-cover=steps=256,shrink=1 "$TESTDIR"/*.c "$PRGDIR"/*.c --dictID=1 -o tmpShrinkDict1
 zstd --train-cover=steps=256,shrink=5 "$TESTDIR"/*.c "$PRGDIR"/*.c --dictID=1 -o tmpShrinkDict2
+zstd --train-cover=shrink=5,steps=256 "$TESTDIR"/*.c "$PRGDIR"/*.c --dictID=1 -o tmpShrinkDict3
 println "- Create dictionary with short dictID"
 zstd --train-cover=k=46,d=8,split=80 "$TESTDIR"/*.c "$PRGDIR"/*.c --dictID=1 -o tmpDict1
 cmp tmpDict tmpDict1 && die "dictionaries should have different ID !"