[libglnx/wip/smcv/assert-true-false] backport-testutils: Add g_assert_true(), g_assert_false()

[Simon McVittie <smcv src gnome org>]

commit a91959e0d45cd624846d2f83edf0d10bae9fc2d0
Author: Simon McVittie <smcv collabora com>
Date:   Mon Oct 10 15:27:56 2022 +0100

    backport-testutils: Add g_assert_true(), g_assert_false()
    
    These were only added in 2.38, and some projects with particularly
    ancient dependencies (like the Steam Runtime, based on a 2012 version
    of Ubuntu) still avoid depending on that version.
    
    Signed-off-by: Simon McVittie <smcv collabora com>

 glnx-backport-testutils.h    |  8 ++++++++
 tests/test-libglnx-testing.c |  4 ++++
 tests/testing-helper.c       | 14 ++++++++++++++
 3 files changed, 26 insertions(+)
---
diff --git a/glnx-backport-testutils.h b/glnx-backport-testutils.h
index 2febcc0..9c17f06 100644
--- a/glnx-backport-testutils.h
+++ b/glnx-backport-testutils.h
@@ -34,6 +34,14 @@
 
 G_BEGIN_DECLS
 
+#ifndef g_assert_true       /* added in 2.38 */
+#define g_assert_true(x) g_assert ((x))
+#endif
+
+#ifndef g_assert_false      /* added in 2.38 */
+#define g_assert_false(x) g_assert (!(x))
+#endif
+
 #ifndef g_assert_nonnull    /* added in 2.40 */
 #define g_assert_nonnull(x) g_assert (x != NULL)
 #endif
diff --git a/tests/test-libglnx-testing.c b/tests/test-libglnx-testing.c
index 279e0e1..aef6eda 100644
--- a/tests/test-libglnx-testing.c
+++ b/tests/test-libglnx-testing.c
@@ -47,6 +47,8 @@ test_assertions (void)
   const char * const strv2[] = {"one", "two", NULL};
   GStatBuf statbuf;
 
+  g_assert_true (null == NULL);
+  g_assert_false (null != NULL);
   g_assert_null (null);
   g_assert_nonnull (nonnull);
   g_assert_cmpmem (null, 0, null, 0);
@@ -64,6 +66,8 @@ test_assertion_failures (void)
 {
   static const char * const assertion_failures[] =
   {
+    "true",
+    "false",
     "nonnull",
     "null",
     "mem_null_nonnull",
diff --git a/tests/testing-helper.c b/tests/testing-helper.c
index 4e00fbe..7c2192c 100644
--- a/tests/testing-helper.c
+++ b/tests/testing-helper.c
@@ -48,6 +48,18 @@ test_messages (void)
                   "That's why libglnx provides a wrapper.\n");
 }
 
+static void
+test_assertion_failure_true (void)
+{
+  g_assert_true (null != NULL);
+}
+
+static void
+test_assertion_failure_false (void)
+{
+  g_assert_false (null == NULL);
+}
+
 static void
 test_assertion_failure_nonnull (void)
 {
@@ -303,6 +315,8 @@ main (int   argc,
     {
       /* Use -p to select a specific one of these */
 #define T(x) g_test_add_func ("/assertion-failure/" #x, test_assertion_failure_ ## x)
+      T (true);
+      T (false);
       T (nonnull);
       T (null);
       T (mem_null_nonnull);