diff --git a/gem/.rubocop.yml b/gem/.rubocop.yml
index 2f36bed..abb5373 100644
--- a/gem/.rubocop.yml
+++ b/gem/.rubocop.yml
@@ -21,6 +21,9 @@ Sorbet:
 
 Sorbet/TrueSigil:
   Enabled: true
+  Exclude:
+  - "**/minitest.rbi"
+
 
 Sorbet/StrictSigil:
   Enabled: true
diff --git a/index.json b/index.json
index 17dc478..40e899a 100644
--- a/index.json
+++ b/index.json
@@ -87,6 +87,8 @@
   },
   "lhm-shopify": {
   },
+  "minitest": {
+  },
   "mocha": {
     "requires": [
       "mocha/api"
diff --git a/rbi/annotations/minitest.rbi b/rbi/annotations/minitest.rbi
new file mode 100644
index 0000000..5560665
--- /dev/null
+++ b/rbi/annotations/minitest.rbi
@@ -0,0 +1,115 @@
+# typed: true
+
+module Minitest::Assertions
+  sig { params(test: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert(test, msg = nil); end
+
+  sig { params(obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_empty(obj, msg = nil); end
+
+  sig { params(exp: T.anything, act: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_equal(exp, act, msg = nil); end
+
+  sig { params(exp: T.anything, act: T.anything, delta: Numeric, msg: T.anything).returns(TrueClass) }
+  def assert_in_delta(exp, act, delta = T.unsafe(nil), msg = nil); end
+
+  sig { params(a: T.anything, b: T.anything, epsilon: Numeric, msg: T.anything).returns(TrueClass) }
+  def assert_in_epsilon(a, b, epsilon = T.unsafe(nil), msg = nil); end
+
+  sig { params(collection: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_includes(collection, obj, msg = nil); end
+
+  sig { params(cls: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_instance_of(cls, obj, msg = nil); end
+
+  sig { params(cls: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_kind_of(cls, obj, msg = nil); end
+
+  sig { params(matcher: T.any(String, Regexp), obj: T.anything, msg: T.anything).returns(MatchData) }
+  def assert_match(matcher, obj, msg = nil); end
+
+  sig { params(obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_nil(obj, msg = nil); end
+
+  sig { params(o1: T.anything, op: T.any(Symbol, String), o2: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_operator(o1, op, o2 = T.unsafe(nil), msg = nil); end
+
+  sig { params(stdout: T.nilable(T.any(String, Regexp)), stderr: T.nilable(T.any(String, Regexp)), block: T.proc.void).returns(T::Boolean) }
+  def assert_output(stdout = nil, stderr = nil, &block); end
+
+  sig { params(path: T.any(String, Pathname), msg: T.anything).returns(TrueClass) }
+  def assert_path_exists(path, msg = nil); end
+
+  sig { params(block: T.proc.void).returns(TrueClass) }
+  def assert_pattern(&block); end
+
+  sig { params(o1: T.anything, op: T.any(String, Symbol), msg: T.anything).returns(TrueClass) }
+  def assert_predicate(o1, op, msg = nil); end
+
+  sig { params(exp: NilClass, block: T.proc.void).returns(StandardError) }
+  sig { type_parameters(:T).params(exp: T.any(T::Class[T.type_parameter(:T)], Regexp, String), block: T.proc.void).returns(T.type_parameter(:T)) }
+  def assert_raises(*exp, &block); end
+
+  sig { params(obj: T.anything, meth: T.any(String, Symbol), msg: T.anything, include_all: T::Boolean).returns(TrueClass) }
+  def assert_respond_to(obj, meth, msg = nil, include_all: false); end
+
+  sig { params(exp: T.anything, act: T.anything, msg: T.anything).returns(TrueClass) }
+  def assert_same(exp, act, msg = nil); end
+
+  sig { params(send_ary: T::Array[T.anything], m: T.anything).returns(T::Boolean) }
+  def assert_send(send_ary, m = nil); end
+
+  sig { params(block: T.proc.void).returns(T::Boolean) }
+  def assert_silent(&block); end
+
+  sig { params(sym: Symbol, msg: T.anything, block: T.proc.void).returns(T.anything) }
+  def assert_throws(sym, msg = nil, &block); end
+
+  sig { params(test: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute(test, msg = nil); end
+
+  sig { params(obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_empty(obj, msg = nil); end
+
+  sig { params(exp: T.anything, act: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_equal(exp, act, msg = nil); end
+
+  sig { params(exp: T.anything, act: T.anything, delta: Numeric, msg: T.anything).returns(TrueClass) }
+  def refute_in_delta(exp, act, delta = T.unsafe(nil), msg = nil); end
+
+  sig { params(a: T.anything, b: T.anything, epsilon: Numeric, msg: T.anything).returns(TrueClass) }
+  def refute_in_epsilon(a, b, epsilon = T.unsafe(nil), msg = nil); end
+
+  sig { params(collection: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_includes(collection, obj, msg = nil); end
+
+  sig { params(cls: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_instance_of(cls, obj, msg = nil); end
+
+  sig { params(cls: T.anything, obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_kind_of(cls, obj, msg = nil); end
+
+  sig { params(matcher: T.any(String, Regexp), obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_match(matcher, obj, msg = nil); end
+
+  sig { params(obj: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_nil(obj, msg = nil); end
+
+  sig { params(block: T.proc.void).returns(TrueClass) }
+  def refute_pattern(&block); end
+
+  sig { params(o1: T.anything, op: T.any(Symbol, String), o2: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_operator(o1, op, o2 = T.unsafe(nil), msg = nil); end
+
+  sig { params(path: T.any(String, Pathname), msg: T.anything).returns(TrueClass) }
+  def refute_path_exists(path, msg = nil); end
+
+  sig { params(o1: T.anything, op: T.any(String, Symbol), msg: T.anything).returns(TrueClass) }
+  def refute_predicate(o1, op, msg = nil); end
+
+  sig { params(obj: T.anything, meth: T.any(String, Symbol), msg: T.anything, include_all: T::Boolean).returns(TrueClass) }
+  def refute_respond_to(obj, meth, msg = nil, include_all: false); end
+
+  sig { params(exp: T.anything, act: T.anything, msg: T.anything).returns(TrueClass) }
+  def refute_same(exp, act, msg = nil); end
+end