Include max cases in ExUnit reports

lib/elixir/pages/mix-and-otp/introduction-to-mix.md

@@ -213,12 +213,11 @@ This file will be required by Mix every time before we run our tests. We can run
 $ mix test
 Compiled lib/kv.ex
 Generated kv app
+Running ExUnit with seed: 540224, max_cases: 16
 ..
 
 Finished in 0.04 seconds
 1 doctest, 1 test, 0 failures
-
-Randomized with seed 540224
 ```
 
 Notice that by running `mix test`, Mix has compiled the source files and generated the application manifest once again. This happens because Mix supports multiple environments, which we will discuss later in this chapter.

lib/ex_unit/lib/ex_unit/cli_formatter.ex

@@ -8,10 +8,12 @@ defmodule ExUnit.CLIFormatter do
   ## Callbacks
 
   def init(opts) do
-    print_filters(Keyword.take(opts, [:include, :exclude]))
+    IO.puts("Running ExUnit with seed: #{opts[:seed]}, max_cases: #{opts[:max_cases]}")
+    print_filters(opts, :exclude)
+    print_filters(opts, :include)
+    IO.puts("")
 
     config = %{
-      seed: opts[:seed],
       trace: opts[:trace],
       colors: colors(opts),
       width: get_terminal_width(),
@@ -356,22 +358,16 @@ defmodule ExUnit.CLIFormatter do
       true ->
         IO.puts(success(message, config))
     end
-
-    IO.puts("\nRandomized with seed #{config.seed}")
   end
 
   defp if_true(value, false, _fun), do: value
   defp if_true(value, true, fun), do: fun.(value)
 
-  defp print_filters(include: [], exclude: []) do
-    :ok
-  end
-
-  defp print_filters(include: include, exclude: exclude) do
-    if exclude != [], do: IO.puts(format_filters(exclude, :exclude))
-    if include != [], do: IO.puts(format_filters(include, :include))
-    IO.puts("")
-    :ok
+  defp print_filters(opts, key) do
+    case opts[key] do
+      [] -> :ok
+      filters -> IO.puts(format_filters(filters, key))
+    end
   end
 
   defp print_failure(formatted, config) do

lib/ex_unit/test/ex_unit_test.exs

@@ -138,8 +138,6 @@ defmodule ExUnitTest do
            Showing results so far...
 
            0 failures
-
-           Randomized with seed 0
            """
   end
 
@@ -926,7 +924,7 @@ defmodule ExUnitTest do
   end
 
   describe ":repeat_until_failure" do
-    test "default value 0" do
+    test "defaults to 0" do
       configure_and_reload_on_exit([])
       ExUnit.start(autorun: false)
       config = ExUnit.configuration()
@@ -940,7 +938,7 @@ defmodule ExUnitTest do
       assert config[:repeat_until_failure] == 5
     end
 
-    test ":repeat_until_failure repeats tests up to the configured number of times" do
+    test "repeats tests up to the configured number of times" do
       defmodule TestRepeatUntilFailureReached do
         use ExUnit.Case
 
@@ -962,12 +960,12 @@ defmodule ExUnitTest do
           assert ExUnit.run() == %{total: 5, failures: 0, skipped: 1, excluded: 1}
         end)
 
-      runs = String.split(output, "Excluding", trim: true)
+      runs = String.split(output, "Running ExUnit", trim: true)
       # 6 runs in total, 5 repeats
       assert length(runs) == 6
     end
 
-    test ":repeat_until_failure stops on failure" do
+    test "stops on failure" do
       {:ok, pid} = Agent.start_link(fn -> 0 end)
       Process.register(pid, :ex_unit_repeat_until_failure_count)
 
@@ -1002,7 +1000,7 @@ defmodule ExUnitTest do
           assert ExUnit.run() == %{total: 4, excluded: 2, failures: 1, skipped: 1}
         end)
 
-      runs = String.split(output, "Excluding", trim: true)
+      runs = String.split(output, "Running ExUnit", trim: true)
       # four runs in total, the first two repeats work fine, the third repeat (4th run)
       # fails, therefore we stop
       assert length(runs) == 4

lib/mix/lib/mix/tasks/test.ex

@@ -36,6 +36,7 @@ defmodule Mix.Tasks.Test do
   a summary at the end, as seen below:
 
       $ mix test
+      Running ExUnit with seed: 646219, max_cases: 16
       ...
 
         1) test greets the world (FooTest)
@@ -52,8 +53,6 @@ defmodule Mix.Tasks.Test do
       Finished in 0.05 seconds (0.00s async, 0.05s sync)
       1 doctest, 11 tests, 1 failure
 
-      Randomized with seed 646219
-
   For each test, the test suite will print a dot. Failed tests
   are printed immediately in the format described in the next
   section.

lib/mix/test/mix/tasks/test_test.exs

@@ -265,7 +265,7 @@ defmodule Mix.Tasks.TestTest do
       in_fixture("test_stale", fn ->
         port = mix_port(~w[test --stale --listen-on-stdin])
 
-        assert receive_until_match(port, "seed", "") =~ "2 tests"
+        assert receive_until_match(port, "0 failures", "") =~ "2 tests"
 
         Port.command(port, "\n")
 
@@ -294,7 +294,7 @@ defmodule Mix.Tasks.TestTest do
 
         Port.command(port, "\n")
 
-        assert receive_until_match(port, "seed", "") =~ "2 tests"
+        assert receive_until_match(port, "0 failures", "") =~ "2 tests"
 
         File.write!("test/b_test_stale.exs", """
         defmodule BTest do
@@ -323,7 +323,7 @@ defmodule Mix.Tasks.TestTest do
 
         Port.command(port, "\n")
 
-        assert receive_until_match(port, "seed", "") =~ "2 tests"
+        assert receive_until_match(port, "0 failures", "") =~ "2 tests"
       end)
     end
   end
@@ -477,38 +477,33 @@ defmodule Mix.Tasks.TestTest do
 
         output = mix(["test", "apps/bar/test/bar_tests.exs"])
 
-        assert output =~ """
-               ==> bar
-               ....
-               """
+        assert output =~ "==> bar"
+        assert output =~ "...."
 
         refute output =~ "==> foo"
         refute output =~ "Paths given to \"mix test\" did not match any directory/file"
 
         output = mix(["test", "./apps/bar/test/bar_tests.exs"])
 
-        assert output =~ """
-               ==> bar
-               ....
-               """
+        assert output =~ "==> bar"
+        assert output =~ "...."
 
         refute output =~ "==> foo"
         refute output =~ "Paths given to \"mix test\" did not match any directory/file"
 
         output = mix(["test", Path.expand("apps/bar/test/bar_tests.exs")])
 
-        assert output =~ """
-               ==> bar
-               ....
-               """
+        assert output =~ "==> bar"
+        assert output =~ "...."
 
         refute output =~ "==> foo"
         refute output =~ "Paths given to \"mix test\" did not match any directory/file"
 
         output = mix(["test", "apps/bar/test/bar_tests.exs:10"])
 
+        assert output =~ "==> bar"
+
         assert output =~ """
-               ==> bar
                Excluding tags: [:test]
                Including tags: [location: {"test/bar_tests.exs", 10}]