simplify WP version detection in install script

Author: louiswol94

tests/install-wp-tests.sh

@@ -25,21 +25,8 @@ download() {
     fi
 }
 
-if [[ $WP_VERSION =~ ^[0-9]+\.[0-9]+\-(beta|RC)[0-9]+$ ]]; then
-	WP_BRANCH=${WP_VERSION%\-*}
-	WP_TESTS_TAG="branches/$WP_BRANCH"
-
-elif [[ $WP_VERSION =~ ^[0-9]+\.[0-9]+$ ]]; then
-	WP_TESTS_TAG="branches/$WP_VERSION"
-elif [[ $WP_VERSION =~ [0-9]+\.[0-9]+\.[0-9]+ ]]; then
-	if [[ $WP_VERSION =~ [0-9]+\.[0-9]+\.[0] ]]; then
-		# version x.x.0 means the first release of the major version, so strip off the .0 and download version x.x
-		WP_TESTS_TAG="tags/${WP_VERSION%??}"
-	else
-		WP_TESTS_TAG="tags/$WP_VERSION"
-	fi
-elif [[ $WP_VERSION == 'nightly' || $WP_VERSION == 'trunk' ]]; then
-	WP_TESTS_TAG="trunk"
+if [[ $WP_VERSION =~ [0-9]+\.[0-9]+(\.[0-9]+)? ]]; then
+	WP_TESTS_TAG="tags/$WP_VERSION"
 else
 	# http serves a single offer, whereas https serves multiple. we only want one
 	download http://api.wordpress.org/core/version-check/1.7/ /tmp/wp-latest.json