testrunner: make `-j100 --runs-per-test=100 test-foo.t` use 100 jobs

It would use only 1 job since 1039404c5e1d (run-tests: print number of
tests and parallel process count, 2018-10-13), but I'm pretty sure
that was unintentional.

Differential Revision: https://phab.mercurial-scm.org/D5557

tests/run-tests.py

@@ -2859,8 +2859,9 b' class TestRunner(object):'
                     testdescs = orig
 
             tests = [self._gettest(d, i) for i, d in enumerate(testdescs)]
-
-            jobs = min(len(tests), self.options.jobs)
+            num_tests = len(tests) * self.options.runs_per_test
+
+            jobs = min(num_tests, self.options.jobs)
 
             failed = False
             kws = self.options.keywords
@@ -2897,7 +2898,7 b' class TestRunner(object):'
                     self._installchg()
 
                 log('running %d tests using %d parallel processes' % (
-                    len(tests), jobs))
+                    num_tests, jobs))
 
                 result = runner.run(suite)
 

tests/test-run-tests.t

@@ -716,6 +716,12 b' failures in parallel with --first should'
 (delete the duplicated test file)
   $ rm test-failure-copy.t
 
+multiple runs per test should be parallelized
+
+  $ rt --jobs 2 --runs-per-test 2 test-success.t
+  running 2 tests using 2 parallel processes 
+  ..
+  # Ran 2 tests, 0 skipped, 0 failed.
 
 Interactive run
 ===============