Remove "ccm" tests

They don't work.

.github/workflows/main.yml

@@ -122,20 +122,6 @@ jobs:
           docker-compose up --detach --build
           ./test/docker/health-check-services.sh
 
-      - name: Install Python (for ccm)
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.9.16"
-
-      - name: Install ccm
-        run: pip3 install ccm
-
-      - name: Install OpenJDK
-        uses: actions/setup-java@v2
-        with:
-          distribution: "zulu"
-          java-version: "11"
-
       - name: Install OTP and Elixir
         uses: erlef/setup-beam@v1
         with:
@@ -161,11 +147,11 @@ jobs:
       # TODO: eventually figure out why we can't run encryption tests on CI.
       - name: Run tests for Cassandra and Scylla
         if: ${{ !matrix.test_only_cassandra }}
-        run: mix test.all --trace --exclude encryption --exclude ccm --exclude toxiproxy
+        run: mix test.all --trace --exclude encryption --exclude toxiproxy
 
       - name: Run tests for Cassandra only
         if: ${{ matrix.test_only_cassandra }}
-        run: mix test --trace --exclude encryption --exclude ccm --exclude toxiproxy
+        run: mix test --trace --exclude encryption --exclude toxiproxy
 
       - name: Dump Docker logs on failure
         uses: jwalton/gh-docker-logs@v1

mix.exs

@@ -80,7 +80,7 @@ defmodule Xandra.Mixfile do
           System.put_env("CASSANDRA_PORT", "9062")
           System.put_env("CASSANDRA_WITH_AUTH_PORT", "9063")
         end,
-        "test --exclude cassandra_specific --exclude encryption --exclude ccm --include scylla_specific"
+        "test --exclude cassandra_specific --exclude encryption --include scylla_specific"
       ],
       "test.all": fn args ->
         Mix.Task.run(:test, args)

test/test_helper.exs

@@ -13,19 +13,6 @@ excluded =
     nil -> [:skip_for_native_protocol_v4, :skip_for_native_protocol_v3]
   end
 
-excluded =
-  if System.find_executable("ccm") do
-    excluded
-  else
-    message = """
-    ccm was not found in your PATH. Xandra requires it in order to run cluster tests, so \
-    we're skipping ccm-based tests for now. Make sure you can run "ccm" in your shell.\
-    """
-
-    IO.puts(IO.ANSI.format([:yellow, "WARNING: ", :reset, message, ?\n]))
-    excluded ++ [:ccm]
-  end
-
 Mox.defmock(LBPMock, for: Xandra.Cluster.LoadBalancingPolicy)
 
 ExUnit.start(exclude: excluded, assert_receive_timeout: 1_000)