feat: add tests for linux (#39)

* feat: add dummy test for linux

* feat: add multiple test execution

* fix: update exec of multiple scripts for linux

* fix: execute tests with code from the branch

* fix: fail test exec if at least one test fail

* fix: typo

* wip: test if symlink work

* feat: add new test for check setup of light256 theme

* feat: when theme enabled and not set it default to dark256

* feat: increase tests coverage of checking themes activation

* refactor: rename tests_linux job

* chore: add changelog entry

tests/tmux_helpers.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+helper_teardown() {
+  echo "TEARDOWN"
+  rm -rf ~/.tmux.conf
+  rm -rf ~/.tmux/
+  tmux kill-server >/dev/null 2>&1
+}
+
+helper_tearup_linux() {
+  if [[ "$(uname)" != "Linux" ]]; then
+    echo "NOT LINUX. Failed & exit."
+    exit 1
+  fi
+  echo "TEARUP LINUX"
+
+  # install software
+  sudo apt update -y
+  sudo apt install -y tmux git
+
+  # download TPM
+  mkdir -p ~/.tmux/plugins/
+  git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
+}
+
+helper_print_fail() {
+  local _msg="${1}"
+  local _current_val="${2}"
+  local _expected_val="${3}"
+  printf "FAIL. %s\n" "${_msg}"
+  printf "current value:\t%s\n" "$_current_val"
+  printf "expected value:\t%s\n" "$_expected_val"
+}
+
+helper_print_success() {
+  local _msg="${1:-}"
+  printf "SUCCESS. %s\n" "${_msg}"
+}
+
+helper_print_fail_and_exit() {
+  helper_print_fail "$1" "$2" "$3"
+  exit 1
+}
+
+helper_print_success_and_exit() {
+  helper_print_success "$1" "$2" "$3"
+  exit 0
+}
+
+# install TMP plugins with command
+helper_install_tpm_plugins() {
+  bash -c "${HOME}/.tmux/plugins/tpm/scripts/install_plugins.sh install_plugins"
+}
+
+helper_get_project_root_dir() {
+  _current_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+  echo "${_current_dir}/../"
+}