[#232] better error when requiring unknown namespace

test/babashka/classpath_test.clj

@@ -14,7 +14,10 @@
              "(require '[my-script :as ms]) (ms/foo)")))
   (is (= "hello from foo\n"
          (tu/bb nil "--classpath" "test-resources/babashka/src_for_classpath_test/foo.jar"
-                "(require '[foo :as f]) (f/foo)"))))
+                "(require '[foo :as f]) (f/foo)")))
+  (is (thrown-with-msg? Exception #"not require"
+         (tu/bb nil
+                "(require '[foo :as f])"))))
 
 (deftest classpath-env-test
   ;; for this test you have to set `BABASHKA_CLASSPATH` to test-resources/babashka/src_for_classpath_test/env

test/babashka/test_utils.clj

@@ -8,6 +8,7 @@
 (set! *warn-on-reflection* true)
 
 (defn bb-jvm [input & args]
+  (reset! main/cp-state nil)
   (let [os (java.io.StringWriter.)
         es (java.io.StringWriter.)
         is (when input