test: Add more kubectx tests (#111)

test/common.bash

@@ -0,0 +1,22 @@
+#!/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_context() {
+    kubectl config current-context
+}