fix: refactored mp_getconstraints due to apparent bug in dictionary.table_constraints. Added test. Closes #83

tests/crossplatform/mp_getconstraints.test.sas

@@ -0,0 +1,29 @@
+/**
+  @file
+  @brief Testing mp_getconstraints.sas macro
+
+  <h4> SAS Macros </h4>
+  @li mf_nobs.sas
+  @li mp_getconstraints.sas
+  @li mp_assert.sas
+
+**/
+
+proc sql;
+create table work.example(
+  TX_FROM float format=datetime19.,
+  DD_TYPE char(16),
+  DD_SOURCE char(2048),
+  DD_SHORTDESC char(256),
+  constraint pk primary key(tx_from, dd_type,dd_source),
+  constraint unq unique(tx_from, dd_type),
+  constraint nnn not null(DD_SHORTDESC)
+);
+
+%mp_getconstraints(lib=work,ds=example,outds=work.constraints)
+
+%mp_assert(
+  iftrue=(%mf_nobs(work.constraints)=6),
+  desc=Output table work.constraints created with correct number of records,
+  outds=work.test_results
+)