@time actually fix time report commas & add tests (#55982)

#55977 looked simple but wasn't
quite right because of a bad pattern in the lock conflicts report
section.

So fix and add tests.

base/timing.jl

@@ -206,7 +206,7 @@ function time_print(io::IO, elapsedtime, bytes=0, gctime=0, allocs=0, lock_confl
             print(io, length(timestr) < 10 ? (" "^(10 - length(timestr))) : "")
         end
         print(io, timestr, " seconds")
-        parens = bytes != 0 || allocs != 0 || gctime > 0 || compile_time > 0 || lock_conflicts > 0
+        parens = bytes != 0 || allocs != 0 || gctime > 0 || lock_conflicts > 0 || compile_time > 0
         parens && print(io, " (")
         if bytes != 0 || allocs != 0
             allocs, ma = prettyprint_getunits(allocs, length(_cnt_units), Int64(1000))
@@ -224,8 +224,11 @@ function time_print(io::IO, elapsedtime, bytes=0, gctime=0, allocs=0, lock_confl
             print(io, Ryu.writefixed(Float64(100*gctime/elapsedtime), 2), "% gc time")
         end
         if lock_conflicts > 0
+            if bytes != 0 || allocs != 0 || gctime > 0
+                print(io, ", ")
+            end
             plural = lock_conflicts == 1 ? "" : "s"
-            print(io, ", ", lock_conflicts, " lock conflict$plural")
+            print(io, lock_conflicts, " lock conflict$plural")
         end
         if compile_time > 0
             if bytes != 0 || allocs != 0 || gctime > 0 || lock_conflicts > 0

test/misc.jl

@@ -360,6 +360,15 @@ let foo() = 1
     @test @timev foo() true
 end
 
+# this is internal, but used for easy testing
+@test sprint(Base.time_print, 1e9) == "  1.000000 seconds"
+@test sprint(Base.time_print, 1e9, 111, 0, 222) == "  1.000000 seconds (222 allocations: 111 bytes)"
+@test sprint(Base.time_print, 1e9, 111, 0.5e9, 222) == "  1.000000 seconds (222 allocations: 111 bytes, 50.00% gc time)"
+@test sprint(Base.time_print, 1e9, 111, 0, 222, 333) == "  1.000000 seconds (222 allocations: 111 bytes, 333 lock conflicts)"
+@test sprint(Base.time_print, 1e9, 0, 0, 0, 333) == "  1.000000 seconds (333 lock conflicts)"
+@test sprint(Base.time_print, 1e9, 111, 0, 222, 333, 0.25e9) == "  1.000000 seconds (222 allocations: 111 bytes, 333 lock conflicts, 25.00% compilation time)"
+@test sprint(Base.time_print, 1e9, 111, 0.5e9, 222, 333, 0.25e9, 0.175e9) == "  1.000000 seconds (222 allocations: 111 bytes, 50.00% gc time, 333 lock conflicts, 25.00% compilation time: 70% of which was recompilation)"
+
 # @showtime
 @test @showtime true
 let foo() = true