Fix GSetttings schema error running tests. Bug 776837.

* test/main.vala (main): Set the location of the compiled dev schema
  before running any tests.

* test/CMakeLists.txt: Pass location of compiled GSettings schema through
  to the test source. Depend on the geary binary so things like the
  shcema are already compiled before compiling the tests.

test/CMakeLists.txt

@@ -47,6 +47,7 @@ set(CFLAGS
     ${DEPS_CFLAGS}
     ${DEPS_CFLAGS_OTHER}
     -D_BUILD_ROOT_DIR=\"${CMAKE_BINARY_DIR}\"
+    -D_GSETTINGS_DIR=\"${CMAKE_BINARY_DIR}/gsettings\"
     -D_SOURCE_ROOT_DIR=\"${CMAKE_SOURCE_DIR}\"
 )
 
@@ -78,4 +79,7 @@ OPTIONS
 )
 
 add_executable(geary-test ${TEST_VALA_C})
+# Depend on geary so things like GResources, GSetting, etc are
+# compiled before the tests are built and run.
+add_dependencies(geary-test geary)
 target_link_libraries(geary-test ${DEPS_LIBRARIES} geary-client geary-engine)

test/main.vala

@@ -5,6 +5,9 @@
  * (version 2.1 or later). See the COPYING file in this distribution.
  */
 
+// Defined by CMake build script.
+extern const string _GSETTINGS_DIR;
+
 int main(string[] args) {
     /*
      * Set env vars right up front to avoid weird bugs
@@ -14,6 +17,9 @@ int main(string[] args) {
     // values, and b) don't persist any changes made during a test
     Environment.set_variable("GSETTINGS_BACKEND", "memory", true);
 
+    // Let GSettings know where to find the dev schema
+    Environment.set_variable("GSETTINGS_SCHEMA_DIR", _GSETTINGS_DIR, true);
+
     /*
      * Initialise all the things.
      */