feat(script): add steps-lib, is_env_var_set & test

Author: jsjoeio

ci/steps/steps-lib.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# This is a library which contains functions used inside ci/steps
+#
+# We separated it into it's own file so that we could easily unit test
+# these functions and helpers
+
+# Checks whether and environment variable is set.
+# Source: https://stackoverflow.com/a/62210688/3015595
+is_env_var_set() {
+  local name="${1:-}"
+  if test -n "${!name:-}"; then
+    echo 0
+  else
+    echo 1
+  fi
+}

test/scripts/steps-lib.bats

@@ -0,0 +1,16 @@
+#!/usr/bin/env bats
+
+SCRIPT_NAME="steps-lib.sh"
+SCRIPT="$BATS_TEST_DIRNAME/../../ci/steps/$SCRIPT_NAME"
+
+source "$SCRIPT"
+
+@test "is_env_var_set should return false if env var is not set" {
+  run is_env_var_set "ASDF_TEST_SET"
+  [ "$output" = 1 ]
+}
+
+@test "is_env_var_set should return true if env var is set" {
+  ASDF_TEST_SET="test" run is_env_var_set "ASDF_TEST_SET"
+  [ "$output" = 0 ]
+}