MailMerge: Break test source file into separate driver and test files

Allow adding additional, unrelated unit tests.

src/client/plugin/mail-merge/mail-merge-test-reader.vala

@@ -5,11 +5,11 @@
  * (version 2.1 or later). See the COPYING file in this distribution.
  */
 
-public class ReaderTests : ValaUnit.TestCase {
+public class Plugin.MailMergeTestReader : ValaUnit.TestCase {
 
 
-    public ReaderTests() {
-        base("ReaderTests");
+    public MailMergeTestReader() {
+        base("MailMergeTestReader");
         add_test("read_simple_lf", read_simple_lf);
         add_test("read_simple_crlf", read_simple_crlf);
         add_test("read_no_trailing_new_line", read_no_trailing_new_line);
@@ -158,24 +158,3 @@ bar",""""""";
     }
 
 }
-
-
-int main(string[] args) {
-    Test.init(ref args);
-
-    typeof(ReaderTests).name();
-
-    TestSuite root = TestSuite.get_root();
-    root.add_suite(new ReaderTests().suite);
-
-    MainLoop loop = new MainLoop();
-    int ret = -1;
-    Idle.add(() => {
-            ret = Test.run();
-            loop.quit();
-            return false;
-        });
-
-    loop.run();
-    return ret;
-}

src/client/plugin/mail-merge/mail-merge-test.vala

@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2020 Michael Gratton <mike@vee.net>
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later). See the COPYING file in this distribution.
+ */
+
+
+int main(string[] args) {
+    GLib.Test.init(ref args);
+    Geary.RFC822.init();
+    Geary.HTML.init();
+    Geary.Logging.init();
+    if (GLib.Test.verbose()) {
+        GLib.Log.set_writer_func(Geary.Logging.default_log_writer);
+        Geary.Logging.log_to(GLib.stdout);
+    }
+
+    GLib.TestSuite root = GLib.TestSuite.get_root();
+    root.add_suite(new Plugin.MailMergeTestReader().suite);
+
+    GLib.MainLoop loop = new GLib.MainLoop();
+    int ret = -1;
+    GLib.Idle.add(() => {
+            ret = Test.run();
+            loop.quit();
+            return false;
+        });
+
+    loop.run();
+    return ret;
+}

src/client/plugin/mail-merge/meson.build

@@ -14,7 +14,8 @@ lib_src = files(
 )
 
 test_src = files(
-  'util-test.vala'
+  'mail-merge-test-reader.vala',
+  'mail-merge-test.vala'
 )
 
 lib = static_library(