add boilerplate to ease regression testing

shf-tests.mlb

@@ -38,4 +38,5 @@ fcore/app-update.sml
 test/Railroad/src/railroad.mlb
 test/normal-move.sml
 test/normal-delete.sml
+test/regression.sml
 test/test.sml

test/regression.sml

@@ -0,0 +1,43 @@
+structure Regression =
+struct
+  open Railroad
+  open Railroad.Test
+
+  fun updateLoop (pos, str, app) =
+    if pos = String.size str then
+      app
+    else
+      let
+        val chr = String.sub (str, pos)
+        val app = AppUpdate.update (app, InputMsg.CHAR_EVENT chr)
+      in
+        updateLoop (pos + 1, str, app)
+      end
+
+  fun updateAppWithChars (historyString, app) =
+    updateLoop (0, historyString, app)
+
+  fun appFromText text =
+    let val buffer = LineGap.fromString text
+    in AppType.init (buffer, 0, 0)
+    end
+
+  fun loadFromFile (io, acc) =
+    case TextIO.inputLine io of
+      SOME line => loadFromFile (io, acc ^ line)
+    | NONE => acc
+
+  val initialText =
+    let
+      val io = TextIO.openIn "temp.txt"
+      val str = loadFromFile (io, "")
+      val () = TextIO.closeIn io
+    in
+      str
+    end
+
+  val charEventTests = describe "CHAR_EVENT regressions"
+    [test "placeholder" (fn _ => Expect.isTrue true)]
+
+  val tests = [charEventTests]
+end

test/test.sml

@@ -1,12 +1,16 @@
-fun main () =
-  let
-    open Railroad
-    open Railroad.Test
+structure Test =
+struct
+  open Railroad
+  open Railroad.Test
 
-    val tests = NormalMove.tests @ NormalDelete.tests
-    val tests = concat tests
-  in
-    runWithConfig [Configuration.PrintPassed false] tests
-  end
+  fun main () =
+    let
+      val tests =
+        List.concat [NormalMove.tests, NormalDelete.tests, Regression.tests]
+      val tests = concat tests
+    in
+      runWithConfig [Configuration.PrintPassed false] tests
+    end
+end
 
-val () = main ()
+val () = Test.main ()