diff --git a/src/test/lemondronor/advisorycircular_test.cljs b/src/test/lemondronor/advisorycircular_test.cljs
index c80cb1e..87d79e5 100644
--- a/src/test/lemondronor/advisorycircular_test.cljs
+++ b/src/test/lemondronor/advisorycircular_test.cljs
@@ -414,3 +414,46 @@
            (p/let [r (advisorycircular/closest-airport conf 0 0)]
              (is (= r a3)))))
        (done)))))
+
+
+(deftest validate-config
+  (testing "Good config w/ lat-lon-radius"
+    (advisorycircular/validate-config
+     {:adsbx {:api-key "my-adsbx-key"
+              :url "http://adsbx"}
+      :aircraft-info-db-path "/"
+      :pelias {:url "http://pelias/"}
+      :lat 0
+      :lon 1
+      :radius-km 5}))
+  (testing "Bad config missing radius"
+    (is (thrown-with-msg?
+         js/Error #"Missing configuration values.*radius"
+         (advisorycircular/validate-config
+          {:adsbx {:api-key "my-adsbx-key"
+                   :url "http://adsbx"}
+           :aircraft-info-db-path "/"
+           :pelias {:url "http://pelias/"}
+           :lat 0
+           :lon 1}))))
+  (testing "Bad config missing everything"
+    (is (thrown-with-msg?
+         js/Error #"Missing configuration values.*adsbx"
+         (advisorycircular/validate-config {}))))
+  (testing "Bad config missing lat-lon-radius"
+    (is (thrown-with-msg?
+         js/Error #"Missing configuration values.*lat.*lon.*radius-km"
+         (advisorycircular/validate-config
+          {:adsbx {:api-key "my-adsbx-key"
+                   :url "http://adsbx"}
+           :aircraft-info-db-path "/"
+           :pelias {:url "http://pelias/"}}))))
+  (testing "Bad config with icaos instead of lat/lon/radius"
+    (is (thrown-with-msg?
+         js/Error #"Missing configuration values.*lat.*lon.*radius-km"
+         (advisorycircular/validate-config
+          {:adsbx {:api-key "my-adsbx-key"
+                   :url "http://adsbx"}
+           :aircraft-info-db-path "/"
+           :pelias {:url "http://pelias/"}
+           :icaos ["123" "456"]})))))