[geary/wip/composer-folks] Fix engine test failure under flatpak

[Michael Gratton <mjog src gnome org>]

commit 03ca9d7327a2d6e241c858442d682594ec9e07f8
Author: Michael Gratton <mike vee net>
Date:   Mon Jun 24 21:00:51 2019 +1000

    Fix engine test failure under flatpak
    
    Geary.ImapDb.Database/utf8_case_insensitive_collation depends on a well
    known UTF-8 collation order, but Flatpak doesn't ship C.UTF-8, so use
    en_US.UTF-8 instead for the moment.
    
    See https://gitlab.com/freedesktop-sdk/freedesktop-sdk/issues/812

 test/engine/imap-db/imap-db-database-test.vala | 11 ++++++++++-
 test/test-engine.vala                          | 12 ++++++++----
 2 files changed, 18 insertions(+), 5 deletions(-)
---
diff --git a/test/engine/imap-db/imap-db-database-test.vala b/test/engine/imap-db/imap-db-database-test.vala
index 44a4845f..13574c61 100644
--- a/test/engine/imap-db/imap-db-database-test.vala
+++ b/test/engine/imap-db/imap-db-database-test.vala
@@ -147,7 +147,16 @@ class Geary.ImapDB.DatabaseTest : TestCase {
             INSERT INTO Test (test_str) VALUES ('BB');
             INSERT INTO Test (test_str) VALUES ('🤯');
         """);
-        string[] expected = { "a", "BB", "B", "🤯" };
+
+        string locale = GLib.Intl.setlocale(GLib.LocaleCategory.COLLATE);
+        // Flatpak does not currently ship C.UTF-8, so use en_US
+        // instead. See test-engine.vala and
+        // https://gitlab.com/freedesktop-sdk/freedesktop-sdk/issues/812
+        //
+        // This is the expected order under C.UTF-8:
+        // string[] expected = { "a", "BB", "B", "🤯" };
+        // This is the expected order under en_US.UTF-8:
+        string[] expected = { "BB", "B", "a", "🤯" };
 
         Db.Result result = db.query(
             "SELECT test_str FROM Test ORDER BY test_str COLLATE UTF8COLL DESC"
diff --git a/test/test-engine.vala b/test/test-engine.vala
index 55862bd5..2a2ca9c8 100644
--- a/test/test-engine.vala
+++ b/test/test-engine.vala
@@ -10,11 +10,15 @@ int main(string[] args) {
      * Initialise all the things.
      */
 
-    Test.init(ref args);
-
     // Ensure things like e.g. GLib's formatting routines uses a
-    // UTF-8-based locale rather ASCII
-    GLib.Intl.setlocale(LocaleCategory.ALL, "C.UTF-8");
+    // well-known UTF-8-based locale rather ASCII.
+    //
+    // Flatpak does not currently ship C.UTF-8, so use another. See:
+    // https://gitlab.com/freedesktop-sdk/freedesktop-sdk/issues/812
+    // GLib.Intl.setlocale(LocaleCategory.ALL, "C.UTF-8");
+    GLib.Intl.setlocale(LocaleCategory.ALL, "en_US.UTF-8");
+
+    Test.init(ref args);
 
     Geary.RFC822.init();
     Geary.HTML.init();