feat: Add local_target variable and tests

tests/files/basic.plan

@@ -0,0 +1,2 @@
+sources=('file:/home/user')
+targets=('file:/var/backup')

tests/files/multiple_file_targets.plan

@@ -0,0 +1,7 @@
+sources=('file:/home/user')
+targets=(
+    'file:///home/backups'
+    'file:/var/backup'
+    'file:/backups'
+    's3://bucket'
+)

tests/source_script.bats

@@ -39,7 +39,7 @@ setup() {
     assert_output --partial 'Error: targets array is not set'
 }
 
-@test "No targets with file URI scheme" {
+@test "No targets with 'file' URI scheme" {
     . script.sh
     run source_script $DIR/files/no_file_target.plan
     assert_output --partial "Error: 'file' scheme is not set in targets. You must provide one or more targets with 'file' scheme."
@@ -56,3 +56,15 @@ setup() {
     run source_script $DIR/files/unsupported_target_scheme.plan
     assert_output --partial 'Error: Unsupported URI scheme: scp'
 }
+
+@test "Set local target" {
+    . script.sh
+    source_script $DIR/files/basic.plan
+    [ "$local_target" == 'file:/var/backup' ]
+}
+
+@test "Set local target from multiple 'file' targets" {
+    . script.sh
+    source_script $DIR/files/multiple_file_targets.plan
+    [ "$local_target" == 'file:///home/backups' ]
+}