Add tools for UT

Jenkinsfile

@@ -11,6 +11,12 @@ pipeline {
   options {
     skipDefaultCheckout()
   }
+  environment {
+    REPO = 'sw_usb_audio'
+    VIEW = getViewName(REPO)
+    TOOLS_VERSION = "15.2.1"
+    XTAGCTL_VERSION = "v2.0.0"
+  }
   stages {
     stage('Basic tests') {
       agent {
@@ -45,9 +51,8 @@ pipeline {
             }
             stage('Unity tests') {
               steps {
-                dir("${REPO}") {
+                dir("${REPO}/test/xua_unit_tests") {
-                  dir('tests') {
+                  withTools("${env.TOOLS_VERSION}") {
-                    dir('xua_unit_tests') {
                     withVenv {
                       withEnv(["XMOS_CMAKE_PATH=${WORKSPACE}/xcommon_cmake"]) {
                         sh "cmake -G 'Unix Makefiles' -B build"
@@ -62,7 +67,6 @@ pipeline {
             }
           }
         }
-        }
         stage('xCORE builds') {
           steps {
             dir("${REPO}") {