diff --git a/test/excache/introspection_test.exs b/test/excache/introspection_test.exs
new file mode 100644
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+++ b/test/excache/introspection_test.exs
@@ -0,0 +1,158 @@
+defmodule Excache.IntrospectionTest do
+  use Excache.Test.ServerCase, async: false
+
+  alias Excache.Aof
+  alias Excache.Blocking
+  alias Excache.Command
+  alias Excache.Command.Introspection
+  alias Excache.Command.Introspection.Catalog
+  alias Excache.Command.Transaction
+  alias Excache.Config
+  alias Excache.Eviction.Runner
+  alias Excache.Memory
+
+  setup do
+    Config.reset()
+    Runner.resetStats()
+    on_exit(&Config.reset/0)
+    :ok
+  end
+
+  describe "INFO" do
+    test "answers with every default section in the documented order", %{conn: conn} do
+      assert {text, _conn} = Client.command(conn, ["INFO"])
+
+      assert sections(text) == [
+               "Server",
+               "Clients",
+               "Memory",
+               "Persistence",
+               "Stats",
+               "Replication",
+               "Keyspace"
+             ]
+
+      assert String.ends_with?(text, "\r\n\r\n")
+    end
+
+    test "the server section reports the running system, not placeholders", %{conn: conn} do
+      assert {text, _conn} = Client.command(conn, ["INFO", "server"])
+      assert sections(text) == ["Server"]
+
+      values = fields(text)
+
+      assert values["redis_mode"] == "standalone"
+      assert values["excache_version"] == to_string(Application.spec(:excache, :vsn))
+      assert values["run_id"] =~ ~r/^[0-9a-f]{40}$/
+      assert values["arch_bits"] == Integer.to_string(:erlang.system_info(:wordsize) * 8)
+      assert values["process_id"] == to_string(:os.getpid())
+      assert values["elixir_version"] == System.version()
+      assert values["otp_release"] == to_string(:erlang.system_info(:otp_release))
+      assert String.to_integer(values["uptime_in_seconds"]) >= 0
+    end
+
+    test "used_memory matches what the memory accountant reports", %{conn: conn} do
+      assert {{:simple, "OK"}, conn} =
+               Client.command(conn, ["SET", "solo", String.duplicate("payload", 40)])
+
+      assert {text, _conn} = Client.command(conn, ["INFO", "memory"])
+      values = fields(text)
+
+      assert sections(text) == ["Memory"]
+      assert String.to_integer(values["used_memory"]) == Memory.usedMemory()
+      assert values["maxmemory"] == "0"
+      assert values["maxmemory_policy"] == "noeviction"
+      assert values["used_memory_human"] =~ ~r/^[0-9.]+[BKMG]$/
+
+      dataset = String.to_integer(values["used_memory_dataset"])
+      overhead = String.to_integer(values["used_memory_overhead"])
+      assert dataset + overhead == String.to_integer(values["used_memory"])
+    end
+
+    test "the keyspace section counts live keys, volatile keys and the mean ttl", %{conn: conn} do
+      assert {text, conn} = Client.command(conn, ["INFO", "keyspace"])
+      refute String.contains?(text, "db0")
+
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["SET", "plain", "one"])
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["SET", "other", "two"])
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["SET", "timed", "three"])
+      assert {1, conn} = Client.command(conn, ["EXPIRE", "timed", "120"])
+
+      assert {text, _conn} = Client.command(conn, ["INFO", "keyspace"])
+      assert %{"db0" => summary} = fields(text)
+
+      assert [keys, expires, avgTtl] =
+               Regex.run(~r/keys=(\d+),expires=(\d+),avg_ttl=(\d+)/, summary,
+                 capture: :all_but_first
+               )
+
+      assert keys == "3"
+      assert expires == "1"
+      assert String.to_integer(avgTtl) > 118_000
+      assert String.to_integer(avgTtl) <= 120_000
+    end
+
+    test "the persistence section reads the real append only file", %{conn: conn} do
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["SET", "durable", "value"])
+      :ok = Aof.flush()
+
+      assert {text, _conn} = Client.command(conn, ["INFO", "persistence"])
+      values = fields(text)
+
+      assert values["aof_enabled"] == "1"
+      assert values["aof_fsync_policy"] == "everysec"
+      assert values["loading"] == "0"
+
+      size = String.to_integer(values["aof_current_size"])
+      assert size > 0
+      assert size == File.stat!(Aof.path()).size
+    end
+
+    test "the stats section counts connections and eviction refusals", %{conn: conn, port: port} do
+      assert {text, conn} = Client.command(conn, ["INFO", "stats"])
+      before = String.to_integer(fields(text)["total_connections_received"])
+
+      extra = Client.connect(port)
+      assert {{:simple, "PONG"}, _extra} = Client.command(extra, ["PING"])
+
+      assert {text, conn} = Client.command(conn, ["INFO", "stats"])
+      values = fields(text)
+
+      assert String.to_integer(values["total_connections_received"]) == before + 1
+      assert String.to_integer(values["total_net_input_bytes"]) > 0
+      assert values["evicted_keys"] == "0"
+      assert values["oom_rejections"] == "0"
+
+      assert {{:simple, "OK"}, conn} =
+               Client.command(conn, ["SET", "filler", String.duplicate("x", 128)])
+
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["CONFIG", "SET", "maxmemory", "1"])
+      assert {{:error, "OOM" <> _}, conn} = Client.command(conn, ["SET", "toobig", "value"])
+      assert {{:simple, "OK"}, conn} = Client.command(conn, ["CONFIG", "SET", "maxmemory", "0"])
+
+      assert {text, _conn} = Client.command(conn, ["INFO", "stats"])
+      assert String.to_integer(fields(text)["oom_rejections"]) > 0
+
+      Client.close(extra)
+    end
+
+    test "the replication section tells the truth about being a lone master", %{conn: conn} do
+      assert {text, _conn} = Client.command(conn, ["INFO", "replication"])
+      values = fields(text)
+
+      assert values["role"] == "master"
+      assert values["connected_slaves"] == "0"
+      assert values["master_failover_state"] == "no-failover"
+      assert values["repl_backlog_active"] == "0"
+    end
+
+    test "INFO all and INFO everything add the cpu section", %{conn: conn} do
+      assert {plain, conn} = Client.command(conn, ["INFO"])
+      refute "Cpu" in sections(plain)
+
+      assert {all, conn} = Client.command(conn, ["INFO", "all"])
+      assert "Cpu" in sections(all)
+
+      assert {everything, conn} = Client.command(conn, ["INFO", "everything"])
+      assert sections(everything) == sections(all)
+