Fix sql tests failing on the first of the month (#3042)

* initial commit

internal/db/sqltest/tests/hcp/billing/monthly_sessions_all.sql

@@ -107,6 +107,16 @@ begin;
   end;
   $$ language plpgsql;
 
+  create function test_is_not_same_month(start_time timestamptz, end_time timestamptz) returns boolean
+  as $$
+  begin
+    if date_trunc('month', start_time) != date_trunc('month', end_time) then
+      return TRUE;
+    end if;
+    return FALSE;
+  end;
+  $$ language plpgsql;
+
   prepare select_hcp_billing_monthly_sessions_all as
    select *
      from hcp_billing_monthly_sessions_all;
@@ -153,10 +163,20 @@ begin;
       'hcp billing: test_setup_data: should be 48 sessions for yesterday');
   select is(count(*), 1::bigint,
       'hcp_billing_monthly_sessions_all should return 1 row when there are only sessions in this month') from hcp_billing_monthly_sessions_all;
-  select row_eq('select_hcp_billing_monthly_sessions_all',  row(date_trunc('month', now()), date_trunc('hour', now()), 48::bigint),
+  select row_eq('select_hcp_billing_monthly_sessions_all',  row(date_trunc('month', 'yesterday'::timestamptz), date_trunc('day', now()), 48::bigint),
       'hcp_billing_monthly_sessions_all should have 1 row with 48 sessions_pending_count when there are only sessions for yesterday');
-  select results_eq('select_hcp_billing_monthly_sessions_current_month', 'select_hcp_billing_monthly_sessions_all',
-      'hcp_billing_monthly_sessions_current_month and hcp_billing_monthly_sessions_all should be equal');
+  -- On the first day of the month, the data will exist in the prior month, in which case we want to test for an inequality
+  -- between the current month and all months
+  select case when test_is_not_same_month('yesterday'::timestamptz, now())
+    then collect_tap(
+    results_ne('select_hcp_billing_monthly_sessions_current_month', 'select_hcp_billing_monthly_sessions_all',
+               'hcp_billing_monthly_sessions_current_month and hcp_billing_monthly_sessions_all should NOT be equal')
+    )
+    else collect_tap(
+    results_eq('select_hcp_billing_monthly_sessions_current_month', 'select_hcp_billing_monthly_sessions_all',
+                'hcp_billing_monthly_sessions_current_month and hcp_billing_monthly_sessions_all should be equal')
+    )
+  end;
   select results_eq('select_hcp_billing_monthly_sessions_current_month', 'select_hcp_billing_monthly_sessions_last_2_months_1_row',
       'hcp_billing_monthly_sessions_current_month and the first row of hcp_billing_monthly_sessions_last_2_months should be equal');