From f0ee448af4b2a49a178be89ea4ddaa1eb71a548a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Wed, 13 Jul 2022 12:46:52 +0200
Subject: Misc tests.

---
 tests/test/cpp/preprocessor2.scm | 110 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 106 insertions(+), 4 deletions(-)

diff --git a/tests/test/cpp/preprocessor2.scm b/tests/test/cpp/preprocessor2.scm
index b4825907..9f308c9e 100644
--- a/tests/test/cpp/preprocessor2.scm
+++ b/tests/test/cpp/preprocessor2.scm
@@ -46,6 +46,9 @@
                    "6.10.3.5 Scope of macro definitions"
                    "Example 3"))
 
+;; TODO # if (and # elif) aren't yet implemented
+(test-skip (test-match-group "Conditionals" "if"))
+
 (define apply-macro (@@ (c preprocessor2) apply-macro))
 (define build-parameter-map (@@ (c preprocessor2) build-parameter-map))
 (define expand# (@@ (c preprocessor2) expand#))
@@ -760,6 +763,10 @@ X
   'cpp-error-directive
   (run "#error anything goes here"))
 
+(test-error "#error without body"
+  'cpp-error-directive
+  (run "#error"))
+
 (test-group "Pragma"
   (test-group "#pragma"
     (test-equal "#Pragma STDC FP_CONTRACT ON"
@@ -979,6 +986,19 @@ report(x>y, \"x is %d but y is %d\", x, y);
 "))))
 
 
+(test-group "Misc"
+  (test-equal "Null directive"
+    (lex "1\n2")
+    (run "
+1
+#
+2"))
+
+  (test-error "Invalid directive"
+    'cpp-error
+    (run "# invalid"))
+  )
+
 
 (test-group "Conditionals"
   (test-group "ifdef"
@@ -1033,8 +1053,90 @@ x
 2
 #endif")))
 
-;; TODO
-;; if
-;; elif
+  (test-assert "Pre-processing directives are ignored in non-active paths"
+    (run "
+#ifdef X
+#error
+#endif"))
 
-  )
+  ;; Should hold for all tokens, but _Pragma is the only one with observable
+  ;; side effects
+  (test-equal "Tokens aren't expanded in non-active paths"
+    ""
+    (with-output-to-string
+      (lambda ()
+        (run "
+#ifdef X
+_Pragma(\"not-called\")
+#endif"))))
+
+
+  (test-group "Nested conditions"
+    'TODO)
+
+  (test-group "Unexpected if ends"
+   (test-error "#else outside if"
+     'cpp-error (run "#else"))
+   (test-error "#endif outside if"
+     'cpp-error (run "#endif"))
+   (test-error "#elif outside if"
+     'cpp-error (run "#elif")))
+
+  (test-group "if"
+    (test-equal "Simple positive if"
+      (lex "x")
+      (run "
+#if 1
+x
+#endif"))
+
+    (test-equal "Simple negative if"
+      (lex "")
+      (run "
+#if 0
+x
+#endif"))
+
+    (test-equal "Elif isn't run when if is true"
+      (lex "a")
+      (run "
+#if 1
+a
+#elif 1
+b
+#endif"))
+
+    (test-equal "elif is run when if is false"
+      (lex "b")
+      (run "
+#if 0
+a
+#elif 1
+b
+#endif"))
+
+    ;; Note that defined is automatically added to the environment when
+    ;; evaluating #if.
+
+    (test-equal "#if with defined"
+      (lex "a")
+      (run "
+#define X
+#if defined(X)
+a
+#else
+b
+#endif")
+      )
+
+    (test-equal "#if with negative defined"
+      (lex "b")
+      (run "
+#if defined(X)
+a
+#else
+b
+#endif"))
+
+    ;; TODO test advanced constant expression
+    ))
-- 
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