Debugging macro to compare two
GVariants. If the comparison fails,
an error message is logged and the application is either terminated
or the testcase marked as failed. The variants are compared using g_variant_equal().
The effect of
g_assert_cmpvariant (v1, v2) is the same as
g_assert_true (g_variant_equal (v1, v2)). The advantage of this macro is
that it can produce a message that includes the actual values of