dnf has no command to check all

[jd1008]

I had to use
# /bin/yum-deprecated  check all
Yum command has been deprecated, use dnf instead.
See 'man dnf' and 'man yum2dnf' for more information.

Loaded plugins: etckeeper, langpacks
kde-plasma-akonadi-calendars-0.2.2-5.fc21.x86_64 has missing requires of 
plasma4(dataengine-time)
kde-plasma-alsa-volume-0.51.2-2.fc21.noarch has missing requires of 
plasma4(scriptengine-python)
kde-plasma-yawp-0.4.5-4.fc21.x86_64 has missing requires of 
libweather_ion.so.6()(64bit)
kde-style-skulpture-0.2.4-9.fc21.x86_64 has missing requires of 
libkdecorations.so.4()(64bit)
kde-workspace-ksplash-themes-4.11.18-3.fc21.noarch has missing requires 
of kde-workspace = ('0', '4.11.18', '3.fc21')
perl-PlRPC-0.2020-15.fc20.noarch has missing requires of 
perl(:MODULE_COMPAT_5.18.0)

# dnf check all
No such command: check. Please use /bin/dnf --help
It could be a DNF plugin command, try: "dnf install 'dnf-command(check)'"

# dnf install 'dnf-command(check)'
Last metadata expiration check performed 0:32:13 ago on Wed May 27 
19:29:59 2015.
No package dnf-command(check) available.
Error: no package matched: dnf-command(check)

So, how do I install dnf-command(check) ???