add cli tests for kubens (#117)

* split bats test invocation by executable

* add more cli tests for kubens

* clean up kubens tests

* small cleanup to kubens tests

.travis.yml

@@ -5,4 +5,5 @@ before_install:
   - 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/
+  - bats test/kubectx.bats
+  - bats test/kubens.bats

kubens

@@ -54,7 +54,7 @@ current_namespace() {
 }
 
 current_context() {
-  $KUBECTL config view -o=jsonpath='{.current-context}'
+  $KUBECTL config current-context
 }
 
 get_namespaces() {
@@ -173,13 +173,15 @@ swap_namespace() {
 }
 
 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
+  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

test/common.bash

@@ -17,6 +17,14 @@ use_config() {
 
 # wrappers around "kubectl config" command
 
-get_context() {
-    kubectl config current-context
+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/kubens.bats

@@ -1,15 +1,104 @@
 #!/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
-  [ "$status" -eq 0 ]
+  [[ "$status" -eq 0 ]]
 }
 
 @test "-h should not fail" {
   run ${COMMAND} -h
   echo "$output">&2
-  [ "$status" -eq 0 ]
+  [[ "$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/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