Add more detailed tests to the starter app

starter/test/com/example_test.clj

@@ -1,6 +1,46 @@
 (ns com.example-test
   ;; If you add more test files, require them here so that they'll get loaded by com.example/on-save
-  (:require [clojure.test :refer [deftest is]]))
+  (:require [cheshire.core :as cheshire]
+            [clojure.string :as str]
+            [clojure.test :refer [deftest is]]
+            [com.biffweb :as biff :refer [test-xtdb-node]]
+            [com.example :as main]
+            [com.example.app :as app]
+            [malli.generator :as mg]
+            [rum.core :as rum]
+            [xtdb.api :as xt]))
 
 (deftest example-test
   (is (= 4 (+ 2 2))))
+
+(defn get-context [node]
+  {:biff.xtdb/node  node
+   :biff/db         (xt/db node)
+   :biff/malli-opts #'main/malli-opts})
+
+(deftest send-message-test
+  (with-open [node (test-xtdb-node [])]
+    (let [message (mg/generate :string)
+          user    (mg/generate :user main/malli-opts)
+          ctx     (assoc (get-context node) :session {:uid (:xt/id user)})
+          _       (app/send-message ctx {:text (cheshire/generate-string {:text message})})
+          db      (xt/db node) ; get a fresh db value so it contains any transactions
+                               ; that send-message submitted.
+          doc     (biff/lookup db :msg/text message)]
+      (is (some? doc))
+      (is (= (:msg/user doc) (:xt/id user))))))
+
+(deftest chat-test
+  (let [n-messages (+ 3 (rand-int 10))
+        now        (java.util.Date.)
+        messages   (for [doc (mg/sample :msg (assoc main/malli-opts :size n-messages))]
+                     (assoc doc :msg/sent-at now))]
+    (with-open [node (test-xtdb-node messages)]
+      (let [response (app/chat {:biff/db (xt/db node)})
+            html     (rum/render-html response)]
+        (is (str/includes? html "Messages sent in the past 10 minutes:"))
+        (is (not (str/includes? html "No messages yet.")))
+        ;; If you add Jsoup to your dependencies, you can use DOM selectors instead of just regexes:
+        ;(is (= n-messages (count (.select (Jsoup/parse html) "#messages > *"))))
+        (is (= n-messages (count (re-seq #"init send newMessage to #message-header" html))))
+        (is (every? #(str/includes? html (:msg/text %)) messages))))))