"yotta shrinkwrap" doesn't seem to work with test dependencies

[bogdanm]

mbedtls $ yt ls
mbedtls 2.2.1
┣━ cmsis-core 1.1.2
┃ ┗━ cmsis-core-freescale 1.0.0 yotta_modules/cmsis-core-freescale
┃   ┗━ cmsis-core-k64f 1.0.0 yotta_modules/cmsis-core-k64f
┗━ mbed-drivers 1.3.0 (test dependency)
  ┣━ mbed-hal 1.2.2 yotta_modules/mbed-hal
  ┃ ┗━ mbed-hal-freescale 1.0.0 yotta_modules/mbed-hal-freescale
  ┃   ┗━ mbed-hal-ksdk-mcu 1.1.0 yotta_modules/mbed-hal-ksdk-mcu
  ┃     ┣━ uvisor-lib 2.0.0 yotta_modules/uvisor-lib
  ┃     ┗━ mbed-hal-k64f 1.2.0 yotta_modules/mbed-hal-k64f
  ┃       ┗━ mbed-hal-frdm-k64f 1.0.2 yotta_modules/mbed-hal-frdm-k64f
  ┣━ ualloc 1.1.0 yotta_modules/ualloc
  ┃ ┗━ dlmalloc 1.0.0 yotta_modules/dlmalloc
  ┣━ minar 1.1.0 yotta_modules/minar
  ┃ ┗━ minar-platform 1.0.0 yotta_modules/minar-platform
  ┃   ┗━ minar-platform-mbed 1.1.3 yotta_modules/minar-platform-mbed
  ┣━ core-util 1.6.0 yotta_modules/core-util
  ┣━ compiler-polyfill 1.2.1 yotta_modules/compiler-polyfill
  ┗━ greentea-client 0.1.8 yotta_modules/greentea-client

mbedtls $ yt shrinkwrap
error: Dependency errors prevent shrinkwrap creation:
error: dependency mbed-hal (required by mbed-drivers) is missing
error: dependency ualloc (required by mbed-drivers) is missing
error: dependency minar (required by mbed-drivers) is missing
error: dependency core-util (required by mbed-drivers) is missing
error: dependency compiler-polyfill (required by mbed-drivers) is missing
error: dependency greentea-client (required by mbed-drivers) is missing
error: Perhaps you need to `yotta install` first?

mbedtls $ yt --version
0.14.1