From 82e73e6c8e7a7613db98f5b229ab7665b9940b00 Mon Sep 17 00:00:00 2001
From: Siraaj Khandkar <siraaj@khandkar.net>
Date: Mon, 28 May 2018 13:42:33 -0400
Subject: [PATCH] Add (incomplete) test case for queens.tig

---
 tiger/src/exe/tiger_tests.ml | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/tiger/src/exe/tiger_tests.ml b/tiger/src/exe/tiger_tests.ml
index 2def01a..761d43e 100644
--- a/tiger/src/exe/tiger_tests.ml
+++ b/tiger/src/exe/tiger_tests.ml
@@ -147,12 +147,62 @@ let test_09 =
   (* TODO: Type error test case *)
   (name, code, tokens)
 
+let test_queens =
+  let code =
+    " \n\
+    /* A program to solve the 8-queens problem */ \n\
+ \n\
+    let \n\
+      var N := 8 \n\
+ \n\
+      type intArray = array of int \n\
+ \n\
+      var row := intArray [ N ] of 0 \n\
+      var col := intArray [ N ] of 0 \n\
+      var diag1 := intArray [N+N-1] of 0 \n\
+      var diag2 := intArray [N+N-1] of 0 \n\
+ \n\
+      function printboard() = ( \n\
+        for i := 0 to N-1 do ( \n\
+          for j := 0 to N-1 do print(if col[i]=j then \" O\" else \" .\"); \n\
+          print(\"\n\") \n\
+        ); \n\
+        print(\"\n\") \n\
+      ) \n\
+ \n\
+      function try(c:int) = ( \n\
+        /*  for i:= 0 to c do print(\".\"); print(\"\n\"); flush();*/ \n\
+        if c=N \n\
+        then printboard() \n\
+        else \n\
+          for r := 0 to N-1 \n\
+          do \n\
+            if row[r]=0 & diag1[r+c]=0 & diag2[r+7-c]=0 \n\
+            then ( \n\
+              row[r]       := 1; \n\
+              diag1[r+c]   := 1; \n\
+              diag2[r+7-c] := 1; \n\
+              col[c]       := r; \n\
+              try(c+1); \n\
+              row[r]       := 0; \n\
+              diag1[r+c]   := 0; \n\
+              diag2[r+7-c] := 0 \n\
+            ) \n\
+      ) \n\
+    in \n\
+      try(0) \n\
+    end \n\
+    "
+  in
+  (code, code, [])
+
 let tests =
   [ test_01
   ; test_02
   ; test_03
   ; test_04
   ; test_09
+  ; test_queens
   ]
 
 let () =
-- 
2.20.1