Implement some end-to-end tests

tests.scm

@@ -0,0 +1,47 @@
+(add-to-load-path (dirname (current-filename)))
+
+(use-modules
+ (e2e marionette)
+ (e2e testing)
+ (ice-9 regex)
+ ((server) #:prefix server-)
+ (srfi srfi-1))
+
+(define (lines s)
+  (string-split s #\newline))
+
+(define (get-result-line client)
+  (let ((display (get-display client)))
+	(last (lines (string-trim-right display)))))
+
+(define server (server-start))
+(define firefox (start-firefox))
+(define client (client-setup))
+
+(navigate client "http://localhost:8080")
+(sleep 5)
+
+(define-test preload-loads-successfully
+  (let* ((display (get-display client))
+		 (first-line (first (lines display))))
+	(assert (string-match "Loading prelude \\.+ done" first-line)
+			(format #f "Prelude load line: ~s" first-line))))
+
+(define-test six-seven-times-dot-cr-yields-42
+  (input-line client "6 7 * . CR")
+  (let* ((result-line (get-result-line client)))
+	(assert (string=? "42" result-line)
+			(format #f "Result line: ~s" result-line))))
+
+(define-test define-hello-then-run-hello-prints-message
+  (input-line client ": HELLO .\" Hello, world!\" CR ;")
+  (input-line client "HELLO")
+  (let* ((result-line (get-result-line client)))
+	(assert (string=? "Hello, world!" result-line)
+			(format #f "Result line: ~s" result-line))))
+
+(run-tests)
+
+(client-teardown client)
+(close-firefox firefox)
+(server-stop server)