Add a test command to the nushell script

do.nu

@@ -10,6 +10,10 @@ def "main run" [] {
     run
 }
 
+def "main test" [] {
+    test
+}
+
 # Generate the documentation in 'target/doc'.
 def "main doc" [] {
     cargo doc --document-private-items --no-deps
@@ -37,13 +41,12 @@ def "main deploy" [
         scp ...$args
     }
 
+    test
+
     cd frontend
     trunk build --release
     cd ..
 
-    cd backend
-    cargo test
-
     if target != "" {
         cargo build --target $target --release
     } else {
@@ -102,3 +105,7 @@ def run_backend [] {
     cargo run
     cd ..
 }
+
+def test [] {
+    cargo test
+}