fix(timer): round duration before splitting off minutes (#14246)

plugins/timer/tests/timer.test.zsh

@@ -0,0 +1,39 @@
+#!/usr/bin/env zsh
+
+# Run with: zsh -df plugins/timer/tests/timer.test.zsh
+emulate -L zsh
+
+source "${0:A:h:h}/timer.plugin.zsh"
+
+typeset -i failures=0 tests=0
+
+check_duration() {
+  local precision=$1 duration=$2 expected=$3
+  local output=$(TIMER_PRECISION=$precision __timer_format_duration $duration)
+  (( tests++ ))
+
+  if [[ $output == "$expected" ]]; then
+    print -r -- "PASS: $duration with precision $precision -> $output"
+  else
+    print -u2 -r -- "FAIL: $duration with precision $precision -> $output (expected $expected)"
+    (( failures++ ))
+  fi
+}
+
+check_duration 1 0.04 /0.0s
+check_duration 1 3.04 /3.0s
+check_duration 1 40.0 /40.0s
+check_duration 1 59.94 /59.9s
+check_duration 1 59.97 /1m0.0s
+check_duration 1 61.5 /1m1.5s
+check_duration 1 73.0 /1m13.0s
+check_duration 1 119.97 /2m0.0s
+check_duration 1 3599.99 /60m0.0s
+check_duration 2 59.996 /1m0.00s
+check_duration 2 0.02 /0.02s
+check_duration 0 1.4 /1s
+check_duration 0 59.6 /1m0s
+check_duration 0 119.5 /2m0s
+
+print -r -- "$tests tests, $failures failures"
+(( failures == 0 ))