[glibmm/wip/dboles/ustring_format_fold_and_test: 2/2] tests/glibmm_ustring_format: Test subst & iomanips

[Daniel Boles <dboles src gnome org>]

commit 36c73b963deb94a346ade6b69e94ae1439b05c9e
Author: Daniel Boles <dboles src gnome org>
Date:   Sun Oct 14 13:33:01 2018 +0100

    tests/glibmm_ustring_format: Test subst & iomanips
    
    We only tested here whether single arguments got formatted without
    throwing exceptions, but not whether they got formatted into the
    expected output or combinations of multiple types and I/O manipulators.
    
    This adds a test for that, so we at least have something to ensure that
    things are working correctly, e.g. if refactoring format() as I just did

 tests/glibmm_ustring_format/main.cc | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/tests/glibmm_ustring_format/main.cc b/tests/glibmm_ustring_format/main.cc
index 0925f84c..76a3efab 100644
--- a/tests/glibmm_ustring_format/main.cc
+++ b/tests/glibmm_ustring_format/main.cc
@@ -1,5 +1,6 @@
 #include <glibmm.h>
 
+#include <iomanip>
 #include <iostream>
 
 int
@@ -27,5 +28,26 @@ main(int, char**)
   // This threw an exception before we added a ustring::FormatStream::stream(char*) overload.
   Glib::ustring::format(cptr);
 
+  // Test substitution of various types and I/O manipulators
+  Glib::ustring expected("The meaning of life is 42, or with 2 decimal places, 42.00.");
+  auto the = "The";
+  std::string meaning("meaning");
+  Glib::ustring life("life");
+  auto number = 42.0;
+  auto places = 2;
+  auto actual = Glib::ustring::format(the, ' ', meaning, " of ", life, " is ",
+                                      number,
+                                      ", or with ", places, " decimal places, ",
+                                      std::fixed, std::setprecision(places), number,
+                                      '.');
+
+  if (actual != expected)
+  {
+    std::cerr << "expected (" << expected.size() << "):\n" << expected << "\n\n"
+              << "actual   (" << actual  .size() << "):\n" << actual   << "\n";
+
+    return EXIT_FAILURE;
+  }
+
   return EXIT_SUCCESS;
 }