Simplify CI (#306)

Author: whatyouhide

.github/workflows/ci.yml

@@ -8,36 +8,51 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-22.04
+    name: Elixir ${{ matrix.elixir }}/OTP ${{ matrix.otp }}
+    runs-on: ${{ matrix.os }}
     env:
       MIX_ENV: test
 
     strategy:
       fail-fast: false
       matrix:
         include:
-          - pair:
-              elixir: 1.14.2
-              otp: 25.0
-            lint: lint
+          # Latest supported versions.
+          - os: ubuntu-22.04
+            elixir: "1.17"
+            otp: "27.0"
+            lint: true
+
+          # This is a middle ground: it's old versions that we probably want to start
+          # requiring at some point, but technically we support older.
+          - os: ubuntu-20.04
+            elixir: "1.13"
+            otp: "22.3"
+
+          # Oldest supported versions.
+          - os: ubuntu-18.04
+            elixir: "1.7.4"
+            otp: "19.3.6.13"
 
     steps:
-      - uses: actions/checkout@v2
+      - name: Check out this repository
+        uses: actions/checkout@v4
 
-      - uses: erlef/setup-beam@v1
+      - name: Set up Erlang and Elixir
+        uses: erlef/setup-beam@v1
         with:
-          otp-version: ${{ matrix.pair.otp }}
-          elixir-version: ${{ matrix.pair.elixir }}
+          otp-version: ${{ matrix.otp }}
+          elixir-version: ${{ matrix.elixir }}
 
       - name: Install dependencies
-        run: mix do deps.get --only $MIX_ENV, deps.compile
+        run: mix deps.get --only $MIX_ENV
 
       - name: Check that code is formatted
         run: mix format --check-formatted
         if: ${{ matrix.lint }}
 
       - name: Check that there are no unused dependencies in mix.lock
-        run: mix deps.get && mix deps.unlock --check-unused
+        run: mix do deps.get, deps.unlock --check-unused
         if: ${{ matrix.lint }}
 
       - name: Compile with --warnings-as-errors
@@ -46,28 +61,3 @@ jobs:
 
       - name: Run tests
         run: mix test
-
-  test_older_elixir:
-    runs-on: ubuntu-18.04
-    env:
-      MIX_ENV: test
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - pair:
-              elixir: 1.7.4
-              otp: 19.3.6.13
-    steps:
-      - uses: actions/checkout@v2
-
-      - uses: erlef/setup-beam@v1
-        with:
-          otp-version: ${{ matrix.pair.otp }}
-          elixir-version: ${{ matrix.pair.elixir }}
-
-      - name: Install dependencies
-        run: mix do deps.get --only $MIX_ENV, deps.compile
-
-      - name: Run tests
-        run: mix test

test/gen_stage_test.exs

@@ -300,6 +300,17 @@ defmodule GenStageTest do
     end
   end
 
+  # TODO: remove this once we require OTP 26+. This is a workaround for changes
+  # in OTP 26 around returning {:stop, _} from start_link and friends. See the
+  # discussion in https://github.com/elixir-lang/gen_stage/pull/306.
+  defmacrop assert_exit_on_older_otp(reason) do
+    quote do
+      if System.otp_release() <= "25" do
+        assert_receive {:EXIT, _, unquote(reason)}
+      end
+    end
+  end
+
   test "generates child_spec/1" do
     assert Counter.child_spec([:hello]) == %{
              id: Counter,
@@ -1256,9 +1267,9 @@ defmodule GenStageTest do
       assert Counter.start_link(:ignore) == :ignore
 
       assert Counter.start_link({:stop, :oops}) == {:error, :oops}
-      assert_receive {:EXIT, _, :oops}
+      assert_exit_on_older_otp(:oops)
       assert Counter.start_link(:unknown) == {:error, {:bad_return_value, :unknown}}
-      assert_receive {:EXIT, _, {:bad_return_value, :unknown}}
+      assert_exit_on_older_otp({:bad_return_value, :unknown})
 
       error = {:bad_opts, "expected :buffer_size to be equal to or greater than 0, got: -1"}
       assert Counter.start_link({:producer, 0, buffer_size: -1}) == {:error, error}
@@ -1402,9 +1413,9 @@ defmodule GenStageTest do
       assert Forwarder.start_link(:ignore) == :ignore
 
       assert Forwarder.start_link({:stop, :oops}) == {:error, :oops}
-      assert_receive {:EXIT, _, :oops}
+      assert_exit_on_older_otp(:oops)
       assert Forwarder.start_link(:unknown) == {:error, {:bad_return_value, :unknown}}
-      assert_receive {:EXIT, _, {:bad_return_value, :unknown}}
+      assert_exit_on_older_otp({:bad_return_value, :unknown})
 
       assert Forwarder.start_link({:consumer, self(), unknown: :value}) ==
                {:error, {:bad_opts, "unknown options [unknown: :value]"}}
@@ -1543,9 +1554,9 @@ defmodule GenStageTest do
       assert Doubler.start_link(:ignore) == :ignore
 
       assert Doubler.start_link({:stop, :oops}) == {:error, :oops}
-      assert_receive {:EXIT, _, :oops}
+      assert_exit_on_older_otp(:oops)
       assert Doubler.start_link(:unknown) == {:error, {:bad_return_value, :unknown}}
-      assert_receive {:EXIT, _, {:bad_return_value, :unknown}}
+      assert_exit_on_older_otp({:bad_return_value, :unknown})
 
       assert Doubler.start_link({:producer_consumer, self(), unknown: :value}) ==
                {:error, {:bad_opts, "unknown options [unknown: :value]"}}