[folks] tests: Enable required BlueZ devices during unit tests

[Philip Withnall <pwithnall src gnome org>]

commit f000f335174aed3d128b0b79909085474d475ec8
Author: Philip Withnall <withnall endlessm com>
Date:   Sun Jul 2 20:52:04 2017 +0100

    tests: Enable required BlueZ devices during unit tests
    
    Since the BlueZ backend has gained the ability to enable and disable
    devices based on their Bluetooth address, and to load that state from a
    file, the unit tests were broken because all devices are disabled by
    default. Fix the tests by writing out a mock configuration file which
    enables the mock devices we want to use.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 tests/lib/bluez/test-case.vala |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)
---
diff --git a/tests/lib/bluez/test-case.vala b/tests/lib/bluez/test-case.vala
index 390147e..d11f7b0 100644
--- a/tests/lib/bluez/test-case.vala
+++ b/tests/lib/bluez/test-case.vala
@@ -47,6 +47,20 @@ public class BluezTest.TestCase : Folks.TestCase
       Environment.set_variable ("FOLKS_BLUEZ_TIMEOUT_DIVISOR", "100", true);
     }
 
+  public override string create_transient_dir ()
+    {
+      var transient = base.create_transient_dir ();
+
+      /* Evolution configuration directory. */
+      var config_dir = Path.build_filename (transient, ".local", "share", "folks");
+
+      if (GLib.DirUtils.create_with_parents (config_dir, 0700) != 0)
+        error ("Unable to create ‘%s’: %s",
+            config_dir, GLib.strerror (GLib.errno));
+
+      return transient;
+    }
+
   /**
    * {@inheritDoc}
    *
@@ -87,6 +101,25 @@ public class BluezTest.TestCase : Folks.TestCase
   public virtual void create_backend ()
     {
       this.bluez_backend = new BluezTest.Backend ();
+
+      /* Whitelist any mock BlueZ devices we will create. */
+      var devices_file_name =
+          Path.build_filename (this.transient_dir, ".local", "share", "folks",
+              "bluez-persona-stores.ini");
+      var devices_file = ("[%s]\n" +
+          "enabled=true\n").printf (((!) this.bluez_backend).primary_device_address);
+
+      GLib.debug ("Creating device enabled file for ‘%s’ at %s", ((!) 
this.bluez_backend).primary_device_address, devices_file_name);
+      try
+        {
+          FileUtils.set_contents (devices_file_name, devices_file);
+        }
+      catch (FileError e1)
+        {
+          error ("Error creating BlueZ backend configuration file ‘%s’: %s",
+              devices_file_name, e1.message);
+        }
+
       ((!) this.bluez_backend).set_up ();
     }