Mock the local time in the test case

src/slurmjobs.rs

@@ -58,7 +58,8 @@ pub fn show_slurm_jobs(window: &Option<u32>, span: &Option<String>) {
         }
         Ok(sacct_output) => {
             let mut writer = io::stdout();
-            format_jobs(&mut writer, &sacct_output, &field_names);
+            let local = time::now_local();
+            format_jobs(&mut writer, &sacct_output, &field_names, &local);
         }
     }
 }
@@ -130,7 +131,7 @@ fn check_ymd(s: &str) -> bool {
     return k == 3;
 }
 
-fn format_jobs(writer: &mut dyn io::Write, sacct_output: &str, field_names: &[&str]) {
+fn format_jobs(writer: &mut dyn io::Write, sacct_output: &str, field_names: &[&str], local: &libc::tm) {
     // Fields that are dates that may be reinterpreted before transmission.
     let date_fields = HashSet::from(["Start", "End", "Submit"]);
 
@@ -163,7 +164,6 @@ fn format_jobs(writer: &mut dyn io::Write, sacct_output: &str, field_names: &[&s
                     // is bound to lead to problems eventually, so reformat.  If parsing
                     // fails, just transmit the date and let the consumer deal with it.
                     if let Ok(mut t) = time::parse_date_and_time_no_tzo(&val) {
-                        let local = time::now_local();
                         t.tm_gmtoff = local.tm_gmtoff;
                         t.tm_isdst = local.tm_isdst;
                         // If t.tm_zone is not null then it must point to static data, so
@@ -285,7 +285,11 @@ pub fn test_format_jobs() {
 "#;
 
     let mut output = Vec::new();
-    format_jobs(&mut output, sacct_output, &field_names);
+    let mut local = time::now_local();
+    // The output below depends on us being in UTC+01:00 and not in dst so mock that.
+    local.tm_gmtoff = 3600;
+    local.tm_isdst = 0;
+    format_jobs(&mut output, sacct_output, &field_names, &local);
 
     // The golang `sacctd` output for the above input.
     let expected = r#"v=0.1.0,JobID=973821,JobIDRaw=973821,User=ec-aaaaa,Account=ec85,State=COMPLETED,Start=2024-11-13T11:08:00+01:00,End=2024-11-13T13:07:24+01:00,ElapsedRaw=7164,ReqCPUS=6,ReqMem=10000M,ReqNodes=1,Submit=2024-11-13T08:30:40+01:00,SystemCPU=22:53.824,TimelimitRaw=400,UserCPU=11:06:33,NodeList=c1-28,Partition=normal,"AllocTRES=billing=6,cpu=6,mem=10000M,node=1",JobName=command