feat: new mx_getgroups.sas macro for cross-platform use

tests/x-platform/mx_getgroups.test.sas

@@ -0,0 +1,31 @@
+/**
+  @file
+  @brief Testing mx_getgroups.test.sas macro
+
+  Be sure to run <code>%let mcTestAppLoc=/Public/temp/macrocore;</code> when
+  running in Studio
+
+  <h4> SAS Macros </h4>
+  @li mf_nobs.sas
+  @li mf_getuser.sas
+  @li mp_assert.sas
+  @li mx_getgroups.sas
+
+**/
+
+
+%mx_getgroups(outds=work.test1)
+
+%mp_assert(
+  iftrue=(%mf_nobs(work.test1)>0),
+  desc=groups were found,
+  outds=work.test_results
+)
+
+%mx_getgroups(outds=work.test2,user=%mf_getuser())
+
+%mp_assert(
+  iftrue=(%mf_nobs(work.test2)>0),
+  desc=groups for current user were found,
+  outds=work.test_results
+)