Add Runner client

Author: andyw8

test/ruby_lsp_rails/runner_client_test.rb

@@ -0,0 +1,50 @@
+# typed: true
+# frozen_string_literal: true
+
+require "test_helper"
+require "ruby_lsp/ruby_lsp_rails/runner_client"
+
+module RubyLsp
+  module Rails
+    class RunnerClientTest < ActiveSupport::TestCase
+      setup do
+        @client = T.let(RunnerClient.new, RunnerClient)
+      end
+
+      teardown do
+        @client.shutdown
+
+        assert_predicate @client.instance_variable_get(:@stdin), :closed?
+        assert_predicate @client.instance_variable_get(:@stdout), :closed?
+        assert_predicate @client.instance_variable_get(:@stderr), :closed?
+        refute_predicate @client.instance_variable_get(:@wait_thread), :alive?
+      end
+
+      test "model returns information for the requested model" do
+        columns = [
+          ["id", "integer"],
+          ["first_name", "string"],
+          ["last_name", "string"],
+          ["age", "integer"],
+          ["created_at", "datetime"],
+          ["updated_at", "datetime"],
+        ]
+        response = T.must(@client.model("User"))
+        assert_equal(columns, response.fetch(:columns))
+        assert_match(%r{db/schema\.rb$}, response.fetch(:schema_file))
+      end
+
+      test "returns nil if model doesn't exist" do
+        assert_nil @client.model("Foo")
+      end
+
+      test "returns nil if class is not a model" do
+        assert_nil @client.model("Time")
+      end
+
+      test "returns nil if class is an abstract model" do
+        assert_nil @client.model("ApplicationRecord")
+      end
+    end
+  end
+end