diff --git a/Gemfile.lock b/Gemfile.lock
index 8cda53d..d3c40a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    code_teams (1.1.0)
+    code_teams (1.2.0)
       sorbet-runtime
 
 GEM
@@ -99,7 +99,7 @@ GEM
     thor (1.3.2)
     unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
-    unicode-emoji (4.0.4)
+    unicode-emoji (4.2.0)
     yard (0.9.37)
     yard-sorbet (0.9.0)
       sorbet-runtime
diff --git a/README.md b/README.md
index 4b7d4a6..5884c8e 100644
--- a/README.md
+++ b/README.md
@@ -111,6 +111,32 @@ if errors.any?
 end
 ```
 
+## Testing
+
+`code_teams` provides test helpers for creating temporary teams in your specs without writing YML files to disk. Add the following to your `spec_helper.rb` (or `rails_helper.rb`):
+
+```ruby
+require 'code_teams/testing'
+
+CodeTeams::Testing.enable!
+```
+
+This gives you:
+- A `code_team_with_config` helper method available in all specs
+- Automatic cleanup of testing teams between examples
+
+Example usage in a spec:
+
+```ruby
+RSpec.describe 'my feature' do
+  it 'works with a team' do
+    team = code_team_with_config(name: 'Test Team')
+
+    expect(CodeTeams.find('Test Team')).to eq(team)
+  end
+end
+```
+
 ## Contributing
 
 Bug reports and pull requests are welcome!
diff --git a/code_teams.gemspec b/code_teams.gemspec
index 9a9a1f7..50d12af 100644
--- a/code_teams.gemspec
+++ b/code_teams.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = 'code_teams'
-  spec.version       = '1.1.0'
+  spec.version       = '1.2.0'
   spec.authors       = ['Gusto Engineers']
   spec.email         = ['dev@gusto.com']
   spec.summary       = 'A low-dependency gem for declaring and querying engineering teams'
diff --git a/lib/code_teams.rb b/lib/code_teams.rb
index c1f341c..4ff6aec 100644
--- a/lib/code_teams.rb
+++ b/lib/code_teams.rb
@@ -85,7 +85,7 @@ def self.from_yml(config_yml)
       )
     end
 
-    sig { params(raw_hash: T::Hash[T.untyped, T.untyped]).returns(Team) }
+    sig { params(raw_hash: T::Hash[String, T.untyped]).returns(Team) }
     def self.from_hash(raw_hash)
       new(
         config_yml: nil,
@@ -104,7 +104,7 @@ def self.register_plugins
       end
     end
 
-    sig { returns(T::Hash[T.untyped, T.untyped]) }
+    sig { returns(T::Hash[String, T.untyped]) }
     attr_reader :raw_hash
 
     sig { returns(T.nilable(String)) }
@@ -113,7 +113,7 @@ def self.register_plugins
     sig do
       params(
         config_yml: T.nilable(String),
-        raw_hash: T::Hash[T.untyped, T.untyped]
+        raw_hash: T::Hash[String, T.untyped]
       ).void
     end
     def initialize(config_yml:, raw_hash:)
diff --git a/lib/code_teams/plugin.rb b/lib/code_teams/plugin.rb
index 2735f31..a651f6f 100644
--- a/lib/code_teams/plugin.rb
+++ b/lib/code_teams/plugin.rb
@@ -25,12 +25,12 @@ def self.data_accessor_name(key = default_data_accessor_name)
     sig { returns(String) }
     def self.default_data_accessor_name
       # e.g., MyNamespace::MyPlugin -> my_plugin
-      Utils.underscore(Utils.demodulize(name))
+      Utils.underscore(Utils.demodulize(T.must(name)))
     end
 
-    sig { params(base: T.untyped).void }
+    sig { params(base: T.class_of(Plugin)).void }
     def self.inherited(base) # rubocop:disable Lint/MissingSuper
-      all_plugins << T.cast(base, T.class_of(Plugin))
+      all_plugins << base
     end
 
     sig { returns(T::Array[T.class_of(Plugin)]) }
diff --git a/lib/code_teams/rspec_helpers.rb b/lib/code_teams/rspec_helpers.rb
new file mode 100644
index 0000000..7eecdac
--- /dev/null
+++ b/lib/code_teams/rspec_helpers.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+#
+# typed: false
+
+require 'securerandom'
+require 'code_teams/testing'
+
+module CodeTeams
+  module RSpecHelpers
+    def code_team_with_config(team_config = {})
+      team_config = team_config.dup
+      team_config[:name] ||= "Fake Team #{SecureRandom.hex(4)}"
+      CodeTeams::Testing.create_code_team(team_config)
+    end
+  end
+end
diff --git a/lib/code_teams/testing.rb b/lib/code_teams/testing.rb
new file mode 100644
index 0000000..c94bee4
--- /dev/null
+++ b/lib/code_teams/testing.rb
@@ -0,0 +1,94 @@
+# frozen_string_literal: true
+#
+# typed: strict
+
+require 'securerandom'
+require 'code_teams'
+require 'code_teams/rspec_helpers'
+
+module CodeTeams
+  # Utilities for tests that need a controlled set of teams without writing YML
+  # files to disk.
+  #
+  # Opt-in by requiring `code_teams/testing`.
+  module Testing
+    extend T::Sig
+
+    THREAD_KEY = T.let(:__code_teams_collection, Symbol)
+    @enabled = T.let(false, T::Boolean)
+
+    sig { void }
+    def self.enable!
+      return if @enabled
+
+      CodeTeams.prepend(CodeTeamsExtension)
+      @enabled = true
+
+      return unless defined?(RSpec)
+
+      T.unsafe(RSpec).configure do |config|
+        config.include CodeTeams::RSpecHelpers
+
+        config.around do |example|
+          example.run
+          # Bust caches because plugins may hang onto stale data between examples.
+          if CodeTeams::Testing.code_teams.any?
+            CodeTeams.bust_caches!
+            CodeTeams::Testing.reset!
+          end
+        end
+      end
+    end
+
+    sig { params(attributes: T::Hash[Symbol, T.untyped]).returns(CodeTeams::Team) }
+    def self.create_code_team(attributes)
+      attributes = attributes.dup
+      attributes[:name] ||= "Fake Team #{SecureRandom.hex(4)}"
+
+      code_team = CodeTeams::Team.new(
+        config_yml: 'tmp/fake_config.yml',
+        raw_hash: Utils.deep_stringify_keys(attributes)
+      )
+
+      code_teams << code_team
+      code_team
+    end
+
+    sig { returns(T::Array[CodeTeams::Team]) }
+    def self.code_teams
+      existing = Thread.current[THREAD_KEY]
+      return existing if existing.is_a?(Array)
+
+      Thread.current[THREAD_KEY] = []
+      T.cast(Thread.current[THREAD_KEY], T::Array[CodeTeams::Team])
+    end
+
+    sig { void }
+    def self.reset!
+      Thread.current[THREAD_KEY] = []
+    end
+
+    module CodeTeamsExtension
+      extend T::Sig
+
+      sig { params(base: Module).void }
+      def self.prepended(base)
+        base.singleton_class.prepend(ClassMethods)
+      end
+
+      module ClassMethods
+        extend T::Sig
+
+        sig { returns(T::Array[CodeTeams::Team]) }
+        def all
+          CodeTeams::Testing.code_teams + super
+        end
+
+        sig { params(name: String).returns(T.nilable(CodeTeams::Team)) }
+        def find(name)
+          CodeTeams::Testing.code_teams.find { |t| t.name == name } || super
+        end
+      end
+    end
+  end
+end
diff --git a/lib/code_teams/utils.rb b/lib/code_teams/utils.rb
index 281cddb..63756b9 100644
--- a/lib/code_teams/utils.rb
+++ b/lib/code_teams/utils.rb
@@ -1,7 +1,14 @@
+# frozen_string_literal: true
+#
+# typed: strict
+
 module CodeTeams
   module Utils
+    extend T::Sig
+
     module_function
 
+    sig { params(string: String).returns(String) }
     def underscore(string)
       string.gsub('::', '/')
         .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
@@ -10,8 +17,24 @@ def underscore(string)
         .downcase
     end
 
+    sig { params(string: String).returns(String) }
     def demodulize(string)
-      string.split('::').last
+      T.must(string.split('::').last)
+    end
+
+    # Recursively converts symbol keys to strings. Top-level input should be a Hash.
+    sig { params(value: T.untyped).returns(T.untyped) }
+    def deep_stringify_keys(value)
+      case value
+      when Hash
+        value.each_with_object({}) do |(k, v), acc|
+          acc[k.to_s] = deep_stringify_keys(v)
+        end
+      when Array
+        value.map { |v| deep_stringify_keys(v) }
+      else
+        value
+      end
     end
   end
 end
diff --git a/spec/lib/code_teams/r_spec_helpers_integration_spec.rb b/spec/lib/code_teams/r_spec_helpers_integration_spec.rb
new file mode 100644
index 0000000..07b031b
--- /dev/null
+++ b/spec/lib/code_teams/r_spec_helpers_integration_spec.rb
@@ -0,0 +1,16 @@
+require 'code_teams/testing'
+
+CodeTeams::Testing.enable!
+
+RSpec.describe CodeTeams::RSpecHelpers do
+  it 'exposes code_team_with_config and makes the team discoverable' do
+    code_team_with_config(name: 'RSpec Team')
+
+    expect(CodeTeams.find('RSpec Team')).not_to be_nil
+  end
+
+  it 'cleans up testing teams between examples' do
+    expect(CodeTeams::Testing.code_teams).to be_empty
+    expect(CodeTeams.find('RSpec Team')).to be_nil
+  end
+end
diff --git a/spec/lib/code_teams/testing_spec.rb b/spec/lib/code_teams/testing_spec.rb
new file mode 100644
index 0000000..53b6e0e
--- /dev/null
+++ b/spec/lib/code_teams/testing_spec.rb
@@ -0,0 +1,15 @@
+require 'code_teams/testing'
+
+CodeTeams::Testing.enable!
+
+RSpec.describe CodeTeams::Testing do
+  describe '.create_code_team' do
+    it 'adds the team to CodeTeams.all and CodeTeams.find' do
+      team = described_class.create_code_team({ name: 'Temp Team', extra_data: { foo: { bar: 1 } } })
+
+      expect(CodeTeams.all).to include(team)
+      expect(CodeTeams.find('Temp Team')).to eq(team)
+      expect(team.raw_hash.dig('extra_data', 'foo', 'bar')).to eq(1)
+    end
+  end
+end