Beef up unit tests for SI95 code

This changes adds some unit tests for SI95 modules which had none
prior, and extends some of the existing tests to improve coverage.

Issue-ID: RIC-777

Change-Id: I5d704776fd9094e8b17e35263cc4680bf822b38c
Signed-off-by: E. Scott Daniels <daniels@att.com>
diff --git a/test/wrapper_static_test.c b/test/wrapper_static_test.c
index 3ca71ba..8f7d1ca 100644
--- a/test/wrapper_static_test.c
+++ b/test/wrapper_static_test.c
@@ -59,5 +59,5 @@
 
 	// -------------------------------------------------------------------------------------------------
 
-	return !!errors;			// 1 or 0 regardless of count
+	return errors;
 }