fix cli-tests issues

Author: daniellerozenblit

tests/cli-tests/compression/basic.sh

@@ -25,8 +25,10 @@ zstd --stdout file | zstd -t
 println bob | zstd | zstd -t
 
 # Test keeping input file when compressing to stdout in gzip mode
-$ZSTD_SYMLINK_DIR/gzip -c file       | zstd -t ; test -f file
-$ZSTD_SYMLINK_DIR/gzip --stdout file | zstd -t ; test -f file
+if $(command -v $ZSTD_SYMLINK_DIR/gzip); then
+    $ZSTD_SYMLINK_DIR/gzip -c file       | zstd -t ; test -f file
+    $ZSTD_SYMLINK_DIR/gzip --stdout file | zstd -t ; test -f file
+fi
 
 # Test --rm
 cp file file-rm

tests/cli-tests/compression/gzip-compat.sh

@@ -6,10 +6,12 @@ set -e
 # set -v
 
 # Test gzip specific compression option
-$ZSTD_SYMLINK_DIR/gzip --fast file ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
-$ZSTD_SYMLINK_DIR/gzip --best file ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
+if $(command -v $ZSTD_SYMLINK_DIR/gzip); then
+    $ZSTD_SYMLINK_DIR/gzip --fast file ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
+    $ZSTD_SYMLINK_DIR/gzip --best file ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
 
-# Test -n / --no-name: do not embed original filename in archive
-$ZSTD_SYMLINK_DIR/gzip -n file           ; grep -qv file file.gz  ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
-$ZSTD_SYMLINK_DIR/gzip --no-name file    ; grep -qv file file.gz  ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
-$ZSTD_SYMLINK_DIR/gzip -c --no-name file | grep -qv file
+    # Test -n / --no-name: do not embed original filename in archive
+    $ZSTD_SYMLINK_DIR/gzip -n file           ; grep -qv file file.gz  ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
+    $ZSTD_SYMLINK_DIR/gzip --no-name file    ; grep -qv file file.gz  ; $ZSTD_SYMLINK_DIR/gzip -d file.gz
+    $ZSTD_SYMLINK_DIR/gzip -c --no-name file | grep -qv file
+fi

tests/cli-tests/compression/window-resize.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 datagen -g1G > file
-zstd --long=31 -1 --single-thread --no-content-size -f file
+zstd --long=30 -1 --single-thread --no-content-size -f file
 zstd -l -v file.zst
 
 # We want to ignore stderr (its outputting "*** zstd command line interface