Release v0.7.0

Per #127 the user community wants to have this feature, primarily as
-c and --current flags.

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

.travis.yml

@@ -0,0 +1,11 @@
+before_install:
+  - sudo add-apt-repository ppa:duggan/bats --yes
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq bats
+  - sudo curl -fsSL -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.13.1/bin/linux/amd64/kubectl
+  - sudo chmod +x /usr/bin/kubectl
+script:
+  - bats test/kubectx.bats
+  - bats test/kubens.bats
+  - shellcheck kubectx
+  - shellcheck kubens

README.md

@@ -1,3 +1,11 @@
+# `kubectx` + `kubens`: Power tools for kubectl
+
+![Latest GitHub release](https://img.shields.io/github/release/ahmetb/kubectx.svg)
+![GitHub stars](https://img.shields.io/github/stars/ahmetb/kubectx.svg?label=github%20stars)
+![Travis (.org) branch](https://img.shields.io/travis/ahmetb/kubectx/master.svg)
+![Proudly written in Bash](https://img.shields.io/badge/written%20in-bash-ff69b4.svg)
+
+
 This repository provides both `kubectx` and `kubens` tools.
 
 
@@ -9,13 +17,14 @@ This repository provides both `kubectx` and `kubens` tools.
 
 # kubectx(1)
 
-kubectx is an utility to manage and switch between kubectl(1) contexts.
+kubectx is a utility to manage and switch between kubectl(1) contexts.
 
 ```
 USAGE:
   kubectx                   : list the contexts
   kubectx <NAME>            : switch to context <NAME>
   kubectx -                 : switch to the previous context
+  kubectx -c, --current     : show the current context name
   kubectx <NEW_NAME>=<NAME> : rename context <NAME> to <NEW_NAME>
   kubectx <NEW_NAME>=.      : rename current-context to <NEW_NAME>
   kubectx -d <NAME>         : delete context <NAME> ('.' for current-context)
@@ -47,13 +56,14 @@ long context names. You don't have to remember full context names anymore.
 
 # kubens(1)
 
-kubens is an utility to switch between Kubernetes namespaces.
+kubens is a utility to switch between Kubernetes namespaces.
 
 ```
 USAGE:
   kubens                    : list the namespaces
   kubens <NAME>             : change the active namespace
   kubens -                  : switch to the previous namespace
+  kubens -c, --current      : show the current namespace
 ```
 
 
@@ -77,22 +87,26 @@ Active namespace is "default".
 
 ### macOS
 
-:confetti_ball: Use the [Homebrew](https://brew.sh/) package manager:
+#### Homebrew
+
+:confetti_ball: If you use [Homebrew](https://brew.sh/) you can install like this:
 
     brew install kubectx
 
 This command will set up bash/zsh/fish completion scripts automatically.
 
-
-- Running `brew install` with `--with-short-names` will install tools with names
-`kctx` and `kns` to prevent prefix collision with `kubectl` name.
-
 - If you like to add context/namespace info to your shell prompt (`$PS1`),
   I recommend trying out [kube-ps1](https://github.com/jonmosco/kube-ps1).
 
+#### MacPorts
+
+If you use [MacPorts](https://www.macports.org) you can install like this:
+
+    sudo port install kubectx
+
 ### Linux
 
-Since `kubectx`/`kubens` are written in Bash, you should be able to instal
+Since `kubectx`/`kubens` are written in Bash, you should be able to install
 them to any POSIX environment that has Bash installed.
 
 - Download the `kubectx`, and `kubens` scripts.
@@ -101,7 +115,38 @@ them to any POSIX environment that has Bash installed.
   - or save them to a directory, then create symlinks to `kubectx`/`kubens` from
     somewhere in your `PATH`, like `/usr/local/bin`
 - Make `kubectx` and `kubens` executable (`chmod +x ...`)
-- Figure out how to install bash/zsh/fish [completion scripts](completion/).
+- Install bash/zsh/fish [completion scripts](completion/).  
+  - For zsh:  
+    The completion scripts have to be in a path that belongs to `$fpath`. Either link or copy them to an existing folder.  
+    If using oh-my-zsh you can do as follows:
+    ```bash
+    mkdir -p ~/.oh-my-zsh/completions
+    chmod -R 755 ~/.oh-my-zsh/completions
+    ln -s /opt/kubectx/completion/kubectx.zsh ~/.oh-my-zsh/completions/_kubectx.zsh
+    ln -s /opt/kubectx/completion/kubens.zsh ~/.oh-my-zsh/completions/_kubens.zsh
+    ```  
+    Note that the leading underscore seems to be a convention.  
+    If not using oh-my-zsh, you could link to `/usr/share/zsh/functions/Completion` (might require sudo), depending on the `$fpath` of your zsh installation.  
+    In case of error, calling `compaudit` might help.
+  - For bash:
+    ```bash
+    git clone https://github.com/ahmetb/kubectx.git ~/.kubectx
+    COMPDIR=$(pkg-config --variable=completionsdir bash-completion)
+    ln -sf ~/.kubectx/completion/kubens.bash $COMPDIR/kubens
+    ln -sf ~/.kubectx/completion/kubectx.bash $COMPDIR/kubectx
+    cat << FOE >> ~/.bashrc
+    
+    
+    #kubectx and kubens
+    export PATH=~/.kubectx:\$PATH
+    FOE
+    ```
+  - For fish:
+    ```fish
+    mkdir -p ~/.config/fish/completions
+    ln -s /opt/kubectx/completion/kubectx.fish ~/.config/fish/completions/
+    ln -s /opt/kubectx/completion/kubens.fish ~/.config/fish/completions/
+    ```
 
 Example installation steps:
 
@@ -113,9 +158,11 @@ sudo ln -s /opt/kubectx/kubens /usr/local/bin/kubens
 
 #### Arch Linux
 
-An unofficial [AUR package](https://aur.archlinux.org/packages/kubectx) `kubectx`
-is available. Install instructions can be found on the [Arch 
-wiki](https://wiki.archlinux.org/index.php/Arch_User_Repository#Installing_packages).
+Available as official Arch Linux package. Install it via:
+
+```bash
+sudo pacman -S kubectx
+```
 
 #### Debian/Ubuntu
 
@@ -135,6 +182,9 @@ with fuzzy searching, you just need to [install
 
 ![kubectx interactive search with fzf](img/kubectx-interactive.gif)
 
+If you have `fzf` installed, but want to opt out of using this feature, set the environment variable `KUBECTX_IGNORE_FZF=1`.
+
+
 -----
 
 ### Customizing colors
@@ -143,7 +193,7 @@ If you like to customize the colors indicating the current namespace or context,
 
 ```
 export KUBECTX_CURRENT_FGCOLOR=$(tput setaf 6) # blue text
-export KUBECTX_CURRENT_BGCOLOR=$(tput setaf 7) # white background
+export KUBECTX_CURRENT_BGCOLOR=$(tput setab 7) # white background
 ```
 
 Colors in the output can be disabled by setting the
@@ -161,7 +211,8 @@ Colors in the output can be disabled by setting the
 | _“Also using it on a daily basis. This and my zsh config that shows me the current k8s context 😉”_ – [@puja108](https://twitter.com/puja108/status/928742521139810305) |
 | _“Lately I've found myself using the kubens command more than kubectx. Both very useful though :-)”_ – [@stuartleeks](https://twitter.com/stuartleeks/status/928562850464907264) |
 | _“yeah kubens rocks!”_ – [@embano1](https://twitter.com/embano1/status/928698440732815360) |
-| _“Special thanks to Ahmet Alp Balkan for creating kubectx, kubens, and kubectl aliases, as these tools made my life better.”_ – [@strebeld](https://medium.com/@strebeld/5-ways-to-enhance-kubectl-ux-97c8893227a)
+| _“Special thanks to Ahmet Alp Balkan for creating kubectx, kubens, and kubectl aliases, as these tools made my life better.”_ – [@strebeld](https://medium.com/@strebeld/5-ways-to-enhance-kubectl-ux-97c8893227a) |
+| _“❤️ this shell script @ahmetb wrote to help make switching between kubectl config contexts a breeze.”_ – [@briandanowski](https://twitter.com/briandanowski/status/1085409568165896193) |
 
 > If you liked `kubectx`, you may like my [`kubectl-aliases`](https://github.com/ahmetb/kubectl-aliases) project, too.
 
@@ -173,4 +224,4 @@ Disclaimer: This is not an official Google product.
 #### Stargazers over time
 
 [![Stargazers over time](https://starcharts.herokuapp.com/ahmetb/kubectx.svg)](https://starcharts.herokuapp.com/ahmetb/kubectx)
-
+![Google Analytics](https://ga-beacon.appspot.com/UA-2609286-17/kubectx/README?pixel)

completion/kubectx.zsh

@@ -5,8 +5,8 @@ PREV=""
 if [ -f "$KUBECTX" ]; then
     # show '-' only if there's a saved previous context
     local PREV=$(cat "${KUBECTX}")
-    _arguments "1: :((- \
-        $(kubectl config get-contexts --output='name')))"
+    _arguments "1: :(-
+        $(kubectl config get-contexts --output='name'))"
 else
     _arguments "1: :($(kubectl config get-contexts --output='name'))"
 fi

kubectx

@@ -21,7 +21,8 @@
 set -eou pipefail
 IFS=$'\n\t'
 
-KUBECTX="${HOME}/.kube/kubectx"
+SELF_CMD="$0"
+KUBECTX="${XDG_CACHE_HOME:-$HOME/.kube}/kubectx"
 
 usage() {
   cat <<"EOF"
@@ -29,28 +30,35 @@ USAGE:
   kubectx                       : list the contexts
   kubectx <NAME>                : switch to context <NAME>
   kubectx -                     : switch to the previous context
+  kubectx -c, --current         : show the current context name
   kubectx <NEW_NAME>=<NAME>     : rename context <NAME> to <NEW_NAME>
   kubectx <NEW_NAME>=.          : rename current-context to <NEW_NAME>
   kubectx -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
                                   (this command won't delete the user/cluster entry
                                   that is used by the context)
 
-  kubectx -h,--help         : show this message
+  kubectx -h,--help             : show this message
 EOF
 }
 
+exit_err() {
+   echo >&2 "${1}"
+   exit 1
+}
+
 current_context() {
-  kubectl config view -o=jsonpath='{.current-context}'
+  $KUBECTL config view -o=jsonpath='{.current-context}'
 }
 
 get_contexts() {
-  kubectl config get-contexts -o=name | sort -n
+  $KUBECTL config get-contexts -o=name | sort -n
 }
 
 list_contexts() {
   set -u pipefail
-  local cur
-  cur="$(current_context)"
+  local cur ctx_list
+  cur="$(current_context)" || exit_err "error getting current context"
+  ctx_list=$(get_contexts) || exit_err "error getting context list"
 
   local yellow darkbg normal
   yellow=$(tput setaf 3 || true)
@@ -61,9 +69,15 @@ list_contexts() {
   cur_ctx_fg=${KUBECTX_CURRENT_FGCOLOR:-$yellow}
   cur_ctx_bg=${KUBECTX_CURRENT_BGCOLOR:-$darkbg}
 
-  for c in $(get_contexts); do
-  if [[ -t 1 && -z "${NO_COLOR:-}" && "${c}" = "${cur}" ]]; then
-    echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
+  for c in $ctx_list; do
+  if [[ -n "${_KUBECTX_FORCE_COLOR:-}" || \
+       -t 1 && -z "${NO_COLOR:-}" ]]; then
+    # colored output mode
+    if [[ "${c}" = "${cur}" ]]; then
+      echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
+    else
+      echo "${c}"
+    fi
   else
     echo "${c}"
   fi
@@ -86,12 +100,14 @@ save_context() {
 }
 
 switch_context() {
-  kubectl config use-context "${1}"
+  $KUBECTL config use-context "${1}"
 }
 
 choose_context_interactive() {
   local choice
-  choice="$(FZF_DEFAULT_COMMAND='kubectx' fzf --ansi || true)"
+  choice="$(_KUBECTX_FORCE_COLOR=1 \
+    FZF_DEFAULT_COMMAND="${SELF_CMD}" \
+    fzf --ansi || true)"
   if [[ -z "${choice}" ]]; then
     echo 2>&1 "error: you did not choose any of the options"
     exit 1
@@ -102,7 +118,7 @@ choose_context_interactive() {
 
 set_context() {
   local prev
-  prev="$(current_context)"
+  prev="$(current_context)" || exit_err "error getting current context"
 
   switch_context "${1}"
 
@@ -122,7 +138,7 @@ swap_context() {
 }
 
 context_exists() {
-  grep -q ^"${1}"\$ <(kubectl config get-contexts -o=name)
+  grep -q ^"${1}"\$ <($KUBECTL config get-contexts -o=name)
 }
 
 rename_context() {
@@ -133,12 +149,17 @@ rename_context() {
     old_name="$(current_context)"
   fi
 
-  if context_exists "${new_name}"; then
-    echo "Context \"${new_name}\" exists, deleting..." >&2
-    kubectl config delete-context "${new_name}" 1>/dev/null 2>&1
+  if ! context_exists "${old_name}"; then
+    echo "error: Context \"${old_name}\" not found, can't rename it." >&2
+    exit 1
   fi
 
-  kubectl config rename-context "${old_name}" "${new_name}"
+  if context_exists "${new_name}"; then
+    echo "Context \"${new_name}\" exists, deleting..." >&2
+    $KUBECTL config delete-context "${new_name}" 1>/dev/null 2>&1
+  fi
+
+  $KUBECTL config rename-context "${old_name}" "${new_name}"
 }
 
 delete_contexts() {
@@ -151,15 +172,24 @@ delete_context() {
   local ctx
   ctx="${1}"
   if [[ "${ctx}" == "." ]]; then
-    ctx="$(current_context)"
+    ctx="$(current_context)" || exit_err "error getting current context"
   fi
   echo "Deleting context \"${ctx}\"..." >&2
-  kubectl config delete-context "${ctx}"
+  $KUBECTL config delete-context "${ctx}"
 }
 
 main() {
+  if hash kubectl 2>/dev/null; then
+    KUBECTL=kubectl
+  elif hash kubectl.exe 2>/dev/null; then
+    KUBECTL=kubectl.exe
+  else
+    echo >&2 "kubectl is not installed"
+    exit 1
+  fi
+
   if [[ "$#" -eq 0 ]]; then
-    if [[ -t 1 && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
+    if [[ -t 1 &&  -z "${KUBECTX_IGNORE_FZF:-}" && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
       choose_context_interactive
     else
       list_contexts
@@ -178,6 +208,11 @@ main() {
   elif [[ "$#" -eq 1 ]]; then
     if [[ "${1}" == "-" ]]; then
       swap_context
+    elif [[ "${1}" == '-c' || "${1}" == '--current' ]]; then
+      # we don't call current_context here for two reasons:
+      # - it does not fail when current-context property is not set
+      # - it does not return a trailing newline
+      kubectl config current-context
     elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
       usage
     elif [[ "${1}" =~ ^-(.*) ]]; then

kubens

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# kubenx(1) is a utility to switch between Kubernetes namespaces.
+# kubens(1) is a utility to switch between Kubernetes namespaces.
 
 # Copyright 2017 Google Inc.
 #
@@ -21,7 +21,8 @@
 set -eou pipefail
 IFS=$'\n\t'
 
-KUBENS_DIR="${HOME}/.kube/kubens"
+SELF_CMD="$0"
+KUBENS_DIR="${XDG_CACHE_HOME:-$HOME/.kube}/kubens"
 
 usage() {
   cat <<"EOF"
@@ -29,14 +30,23 @@ USAGE:
   kubens                    : list the namespaces in the current context
   kubens <NAME>             : change the active namespace of current context
   kubens -                  : switch to the previous namespace in this context
+  kubens -c, --current      : show the current namespace
   kubens -h,--help          : show this message
 EOF
 }
 
+exit_err() {
+   echo >&2 "${1}"
+   exit 1
+}
+
 current_namespace() {
   local cur_ctx
-  cur_ctx="$(current_context)"
-  ns="$(kubectl config view -o=jsonpath="{.contexts[?(@.name==\"${cur_ctx}\")].context.namespace}")"
+
+  cur_ctx="$(current_context)" || exit_err "error getting current context"
+  ns="$($KUBECTL config view -o=jsonpath="{.contexts[?(@.name==\"${cur_ctx}\")].context.namespace}")" \
+     || exit_err "error getting current namespace"
+
   if [[ -z "${ns}" ]]; then
     echo "default"
   else
@@ -45,11 +55,11 @@ current_namespace() {
 }
 
 current_context() {
-  kubectl config view -o=jsonpath='{.current-context}'
+  $KUBECTL config current-context
 }
 
 get_namespaces() {
-  kubectl get namespaces -o=jsonpath='{range .items[*].metadata.name}{@}{"\n"}{end}'
+  $KUBECTL get namespaces -o=jsonpath='{range .items[*].metadata.name}{@}{"\n"}{end}'
 }
 
 escape_context_name() {
@@ -57,7 +67,9 @@ escape_context_name() {
 }
 
 namespace_file() {
-  local ctx="$(escape_context_name "${1}")"
+  local ctx
+
+  ctx="$(escape_context_name "${1}")"
   echo "${KUBENS_DIR}/${ctx}"
 }
 
@@ -81,7 +93,7 @@ save_namespace() {
 
 switch_namespace() {
   local ctx="${1}"
-  kubectl config set-context "${ctx}" --namespace="${2}"
+  $KUBECTL config set-context "${ctx}" --namespace="${2}"
   echo "Active namespace is \"${2}\".">&2
 }
 
@@ -95,7 +107,9 @@ choose_namespace_interactive() {
   fi
 
   local choice
-  choice="$(FZF_DEFAULT_COMMAND='kubens' fzf --ansi || true)"
+  choice="$(_KUBECTX_FORCE_COLOR=1 \
+    FZF_DEFAULT_COMMAND="${SELF_CMD}" \
+    fzf --ansi || true)"
   if [[ -z "${choice}" ]]; then
     echo 2>&1 "error: you did not choose any of the options"
     exit 1
@@ -106,8 +120,8 @@ choose_namespace_interactive() {
 
 set_namespace() {
   local ctx prev
-  ctx="$(current_context)"
-  prev="$(current_namespace)"
+  ctx="$(current_context)" || exit_err "error getting current context"
+  prev="$(current_namespace)" || exit_error "error getting current namespace"
 
   if grep -q ^"${1}"\$ <(get_namespaces); then
     switch_namespace "${ctx}" "${1}"
@@ -132,20 +146,27 @@ list_namespaces() {
   cur_ctx_bg=${KUBECTX_CURRENT_BGCOLOR:-$darkbg}
 
   local cur ns_list
-  cur="$(current_namespace)"
-  ns_list=$(get_namespaces)
+  cur="$(current_namespace)" || exit_err "error getting current namespace"
+  ns_list=$(get_namespaces) || exit_err "error getting namespace list"
+
   for c in $ns_list; do
-    if [[ -t 1 && -z "${NO_COLOR:-}" && "${c}" = "${cur}" ]]; then
+  if [[ -n "${_KUBECTX_FORCE_COLOR:-}" || \
+       -t 1 && -z "${NO_COLOR:-}" ]]; then
+    # colored output mode
+    if [[ "${c}" = "${cur}" ]]; then
       echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
     else
       echo "${c}"
     fi
+  else
+    echo "${c}"
+  fi
   done
 }
 
 swap_namespace() {
   local ctx ns
-  ctx="$(current_context)"
+  ctx="$(current_context)" || exit_err "error getting current context"
   ns="$(read_namespace "${ctx}")"
   if [[ -z "${ns}" ]]; then
     echo "error: No previous namespace found for current context." >&2
@@ -155,8 +176,19 @@ swap_namespace() {
 }
 
 main() {
+  if [[ -z "${KUBECTL:-}" ]]; then
+    if hash kubectl 2>/dev/null; then
+      KUBECTL=kubectl
+    elif hash kubectl.exe  2>/dev/null; then
+      KUBECTL=kubectl.exe
+    else
+      echo >&2 "kubectl is not installed"
+      exit 1
+    fi
+  fi
+
   if [[ "$#" -eq 0 ]]; then
-    if [[ -t 1 && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
+    if [[ -t 1 && -z ${KUBECTX_IGNORE_FZF:-} && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
       choose_namespace_interactive
     else
       list_namespaces
@@ -166,6 +198,8 @@ main() {
       usage
     elif [[ "${1}" == "-" ]]; then
       swap_namespace
+    elif [[ "${1}" == '-c' || "${1}" == '--current' ]]; then
+      current_namespace
     elif [[ "${1}" =~ ^-(.*) ]]; then
       echo "error: unrecognized flag \"${1}\"" >&2
       usage

test/common.bash

@@ -0,0 +1,30 @@
+#!/usr/bin/env bats
+
+# bats setup function
+setup() {
+  export XDG_CACHE_HOME="$(mktemp -d)"
+  export KUBECONFIG="${XDG_CACHE_HOME}/config"
+}
+
+# bats teardown function
+teardown() {
+  rm -rf "$XDG_CACHE_HOME"
+}
+
+use_config() {
+  cp "$BATS_TEST_DIRNAME/testdata/$1" $KUBECONFIG
+}
+
+# wrappers around "kubectl config" command
+
+get_namespace() {
+  kubectl config view -o=jsonpath="{.contexts[?(@.name==\"$(get_context)\")].context.namespace}"
+}
+
+get_context() {
+  kubectl config current-context
+}
+
+switch_context() {
+  kubectl config use-context "${1}"
+}

test/kubectx.bats

@@ -0,0 +1,241 @@
+#!/usr/bin/env bats
+
+COMMAND="$BATS_TEST_DIRNAME/../kubectx"
+
+load common
+
+@test "no kubectl detected" {
+  OLDPATH="$PATH"
+  PATH=/bin
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 1 ]
+  [[ "$output" = "kubectl is not installed" ]]
+  PATH="$OLDPATH"
+}
+
+@test "--help should not fail" {
+  run ${COMMAND} --help
+  echo "$output"
+  [ "$status" -eq 0 ]
+}
+
+@test "-h should not fail" {
+  run ${COMMAND} -h
+  echo "$output"
+  [ "$status" -eq 0 ]
+}
+
+@test "switch to previous context when no one exists" {
+  use_config config1
+
+  run ${COMMAND} -
+  echo "$output"
+  [ "$status" -eq 1 ]
+  [[ "$output" = "error: No previous context found." ]]
+}
+
+@test "list contexts when no kubeconfig exists" {
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ "$output" = "" ]]
+}
+
+@test "get one context and list contexts" {
+  use_config config1
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ "$output" = "user1@cluster1" ]]
+}
+
+@test "get two contexts and list contexts" {
+  use_config config2
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ "$output" = *"user1@cluster1"* ]]
+  [[ "$output" = *"user2@cluster1"* ]]
+}
+
+@test "get two contexts and select contexts" {
+  use_config config2
+
+  run ${COMMAND} user1@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user1@cluster1" ]]
+
+  run ${COMMAND} user2@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user2@cluster1" ]]
+}
+
+@test "get two contexts and switch between contexts" {
+  use_config config2
+
+  run ${COMMAND} user1@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user1@cluster1" ]]
+
+  run ${COMMAND} user2@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user2@cluster1" ]]
+
+  run ${COMMAND} -
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user1@cluster1" ]]
+
+  run ${COMMAND} -
+  echo "$output"
+  [ "$status" -eq 0 ]
+  echo "$(get_context)"
+  [[ "$(get_context)" = "user2@cluster1" ]]
+}
+
+@test "get one context and switch to non existent context" {
+  use_config config1
+
+  run ${COMMAND} "unknown-context"
+  echo "$output"
+  [ "$status" -eq 1 ]
+}
+
+@test "-c/--current fails when no context set" {
+  use_config config1
+
+  run "${COMMAND}" -c
+  echo "$output"
+  [ $status -eq 1 ]
+  run "${COMMAND}" --current
+  echo "$output"
+  [ $status -eq 1 ]
+}
+
+@test "-c/--current prints the current context" {
+  use_config config1
+
+  run "${COMMAND}" user1@cluster1
+  [ $status -eq 0 ]
+
+  run "${COMMAND}" -c
+  echo "$output"
+  [ $status -eq 0 ]
+  [[ "$output" = "user1@cluster1" ]]
+  run "${COMMAND}" --current
+  echo "$output"
+  [ $status -eq 0 ]
+  [[ "$output" = "user1@cluster1" ]]
+}
+
+@test "rename context" {
+  use_config config2
+
+  run ${COMMAND} "new-context=user1@cluster1"
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ ! "$output" = *"user1@cluster1"* ]]
+  [[ "$output" = *"new-context"* ]]
+  [[ "$output" = *"user2@cluster1"* ]]
+}
+
+@test "rename current context" {
+  use_config config2
+
+  run ${COMMAND} user2@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND} new-context=.
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ ! "$output" = *"user2@cluster1"* ]]
+  [[ "$output" = *"user1@cluster1"* ]]
+  [[ "$output" = *"new-context"* ]]
+}
+
+@test "delete context" {
+  use_config config2
+
+  run ${COMMAND} -d "user1@cluster1"
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ ! "$output" = "user1@cluster1" ]]
+  [[ "$output" = "user2@cluster1" ]]
+}
+
+@test "delete current context" {
+  use_config config2
+
+  run ${COMMAND} user2@cluster1
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND} -d .
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ ! "$output" = "user2@cluster1" ]]
+  [[ "$output" = "user1@cluster1" ]]
+}
+
+@test "delete non existent context" {
+  use_config config1
+
+  run ${COMMAND} -d "unknown-context"
+  echo "$output"
+  [ "$status" -eq 1 ]
+}
+
+@test "delete several contexts" {
+  use_config config2
+
+  run ${COMMAND} -d "user1@cluster1" "user2@cluster1"
+  echo "$output"
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ "$output" = "" ]]
+}
+
+@test "delete several contexts including a non existent one" {
+  use_config config2
+
+  run ${COMMAND} -d "user1@cluster1" "non-existent" "user2@cluster1"
+  echo "$output"
+  [ "$status" -eq 1 ]
+
+  run ${COMMAND}
+  echo "$output"
+  [ "$status" -eq 0 ]
+  [[ "$output" = "user2@cluster1" ]]
+}

test/kubens.bats

@@ -0,0 +1,144 @@
+#!/usr/bin/env bats
+
+COMMAND="${BATS_TEST_DIRNAME}/../kubens"
+export KUBECTL="$BATS_TEST_DIRNAME/../test/mock-kubectl"
+
+load common
+
+@test "--help should not fail" {
+  run ${COMMAND} --help
+  echo "$output">&2
+  [[ "$status" -eq 0 ]]
+}
+
+@test "-h should not fail" {
+  run ${COMMAND} -h
+  echo "$output">&2
+  [[ "$status" -eq 0 ]]
+}
+
+@test "list namespaces when no kubeconfig exists" {
+  run ${COMMAND}
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+  [[ "$output" = *"current-context is not set"* ]]
+}
+
+@test "list namespaces" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND}
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = *"ns1"* ]]
+  [[ "$output" = *"ns2"* ]]
+}
+
+@test "switch to existing namespace" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} "ns1"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = *'Active namespace is "ns1"'* ]]
+}
+
+@test "switch to non-existing namespace" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} "unknown-namespace"
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+  [[ "$output" = *'no namespace exists with name "unknown-namespace"'* ]]
+}
+
+@test "switch between namespaces" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} ns1
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  echo "$(get_namespace)"
+  [[ "$(get_namespace)" = "ns1" ]]
+
+  run ${COMMAND} ns2
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  echo "$(get_namespace)"
+  [[ "$(get_namespace)" = "ns2" ]]
+
+  run ${COMMAND} -
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  echo "$(get_namespace)"
+  [[ "$(get_namespace)" = "ns1" ]]
+
+  run ${COMMAND} -
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  echo "$(get_namespace)"
+  [[ "$(get_namespace)" = "ns2" ]]
+}
+
+@test "switch to previous namespace when none exists" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} -
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+  [[ "$output" = *"No previous namespace found for current context"* ]]
+}
+
+@test "switch to namespace when current context is empty" {
+  use_config config1
+
+  run ${COMMAND} -
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+  [[ "$output" = *"current-context is not set"* ]]
+}
+
+@test "-c/--current works when no namespace is set on context" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} "-c"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "default" ]]
+  run ${COMMAND} "--current"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "default" ]]
+}
+
+@test "-c/--current prints the namespace after it is set" {
+  use_config config1
+  switch_context user1@cluster1
+  ${COMMAND} ns1
+
+  run ${COMMAND} "-c"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "ns1" ]]
+  run ${COMMAND} "--current"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "ns1" ]]
+}
+
+@test "-c/--current fails when current context is not set" {
+  use_config config1
+  run ${COMMAND} -c
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+
+  run ${COMMAND} --current
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+}

test/mock-kubectl

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+[[ -n $DEBUG ]] && set -x
+
+set -eou pipefail
+
+if [[ $@ == *'get namespaces'* ]]; then
+  echo "ns1"
+  echo "ns2"
+else
+  kubectl $@
+fi

test/testdata/config1

@@ -0,0 +1,18 @@
+# config with one context
+
+apiVersion: v1
+clusters:
+- cluster:
+    server: ""
+  name: cluster1
+contexts:
+- context:
+    cluster: cluster1
+    user: user1
+  name: user1@cluster1
+current-context: ""
+kind: Config
+preferences: {}
+users:
+- name: user1
+  user: {}

test/testdata/config2

@@ -0,0 +1,24 @@
+# config with two contexts
+
+apiVersion: v1
+clusters:
+- cluster:
+    server: ""
+  name: cluster1
+contexts:
+- context:
+    cluster: cluster1
+    user: user1
+  name: user1@cluster1
+- context:
+    cluster: cluster1
+    user: user2
+  name: user2@cluster1
+current-context: ""
+kind: Config
+preferences: {}
+users:
+- name: user1
+  user: {}
+- name: user2
+  user: {}