Add jobs option in config_file

docs/spec/options/hurl/jobs.option

@@ -5,6 +5,7 @@ value_parser: clap::value_parser!(u32).range(1..)
 help: Maximum number of parallel jobs, 1 to disable parallel execution
 help_heading: Run options
 cli_only: true
+config_file: true
 env_var: HURL_JOBS
 ---
 Maximum number of parallel jobs in parallel mode. Default value corresponds (in most cases) to the current amount of CPUs. Set to 1 to disable parallel execution of files.

integration/hurl/tests_ok/parallel/config/hurl/config

@@ -0,0 +1 @@
+--jobs=1

integration/hurl/tests_ok/parallel/parallel_one_worker_config_file.out

@@ -0,0 +1,7 @@
+Hello A from a parallel world!
+Hello B from a parallel world!
+Hello C from a parallel world!
+Hello D from a parallel world!
+Hello E from a parallel world!
+Hello F from a parallel world!
+Hello G from a parallel world!

integration/hurl/tests_ok/parallel/parallel_one_worker_config_file.ps1

@@ -0,0 +1,13 @@
+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+
+$env:XDG_CONFIG_HOME = "$PSScriptRoot/config"
+
+hurl --parallel `
+  tests_ok/parallel/parallel_a.hurl `
+  tests_ok/parallel/parallel_b.hurl `
+  tests_ok/parallel/parallel_c.hurl `
+  tests_ok/parallel/parallel_d.hurl `
+  tests_ok/parallel/parallel_e.hurl `
+  tests_ok/parallel/parallel_f.hurl `
+  tests_ok/parallel/parallel_g.hurl

integration/hurl/tests_ok/parallel/parallel_one_worker_config_file.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -Eeuo pipefail
+
+XDG_CONFIG_HOME=$(dirname "$0")/config
+export XDG_CONFIG_HOME
+
+hurl --parallel \
+  tests_ok/parallel/parallel_a.hurl \
+  tests_ok/parallel/parallel_b.hurl \
+  tests_ok/parallel/parallel_c.hurl \
+  tests_ok/parallel/parallel_d.hurl \
+  tests_ok/parallel/parallel_e.hurl \
+  tests_ok/parallel/parallel_f.hurl \
+  tests_ok/parallel/parallel_g.hurl

packages/hurl/src/cli/options/config_file/mod.rs

@@ -190,6 +190,22 @@ fn parse_option(reader: &mut Reader, options: &mut CliOptions) -> Result<(), Con
                 })?;
             Ok(())
         }
+        "jobs" => {
+            parse_value_separator(reader)?;
+            save = reader.cursor();
+            let value = parse_value(reader)?;
+            let jobs = value.parse::<usize>().map_err(|_| {
+                ConfigFileError::new(save.pos, "Option --jobs requires an integer value")
+            })?;
+            if jobs < 1 {
+                return Err(ConfigFileError::new(
+                    save.pos,
+                    "Option --jobs requires an integer value >= 1",
+                ));
+            }
+            options.jobs = Some(jobs);
+            Ok(())
+        }
         "limit-rate" => {
             parse_value_separator(reader)?;
             save = reader.cursor();
@@ -498,6 +514,40 @@ mod tests {
         assert_eq!(reader.cursor().pos, Pos::new(2, 1));
     }
 
+    #[test]
+    fn test_parse_option_jobs() {
+        let mut reader = Reader::new("--jobs=4\n");
+        let mut options = CliOptions::default();
+        assert!(parse_option(&mut reader, &mut options).is_ok());
+        assert_eq!(options.jobs, Some(4));
+        assert_eq!(reader.cursor().pos, Pos::new(2, 1));
+    }
+
+    #[test]
+    fn test_parse_option_jobs_with_invalid_value() {
+        let mut reader = Reader::new("--jobs=abc\n");
+        let mut options = CliOptions::default();
+        let error = parse_option(&mut reader, &mut options).unwrap_err();
+        assert_eq!(
+            error,
+            ConfigFileError::new(Pos::new(1, 8), "Option --jobs requires an integer value")
+        );
+    }
+
+    #[test]
+    fn test_parse_option_jobs_with_too_small_value() {
+        let mut reader = Reader::new("--jobs=0\n");
+        let mut options = CliOptions::default();
+        let error = parse_option(&mut reader, &mut options).unwrap_err();
+        assert_eq!(
+            error,
+            ConfigFileError::new(
+                Pos::new(1, 8),
+                "Option --jobs requires an integer value >= 1"
+            )
+        );
+    }
+
     #[test]
     fn test_parse_option_limit_rate() {
         let mut reader = Reader::new("--limit-rate=2000000\n");