diff --git a/spec/cli_options_spec.cr b/spec/cli_options_spec.cr
index b7b54a74..9f7b0ccf 100644
--- a/spec/cli_options_spec.cr
+++ b/spec/cli_options_spec.cr
@@ -1,4 +1,5 @@
 require "../src/crytic/cli_options"
+require "../src/crytic/side_effects"
 require "./spec_helper"
 
 module Crytic
@@ -10,7 +11,7 @@ module Crytic
 
         cli_options_parser(
           std_err: std_err,
-          exit_fun: ->(code : Int32) { exit_code = code })
+          exit_fun: ->(code : Int32) { exit_code = code; nil })
           .parse(["-unknown"])
 
         std_err.to_s.lines.first.should eq "ERROR: -unknown is not a valid option."
@@ -31,7 +32,7 @@ module Crytic
       it "exits when showing the help" do
         exit_code : Int32? = nil
 
-        cli_options_parser(exit_fun: ->(code : Int32) { exit_code = code })
+        cli_options_parser(exit_fun: ->(code : Int32) { exit_code = code; nil })
           .parse(["--help"])
 
         exit_code.should eq 0
@@ -140,5 +141,6 @@ private def cli_options_parser(
   env = fake_env,
   spec_files_glob = Crytic::CliOptions::DEFAULT_SPEC_FILES_GLOB
 )
-  Crytic::CliOptions.new(std_out, std_err, exit_fun, env, spec_files_glob)
+  Crytic::CliOptions.new(Crytic::SideEffects.new(
+    std_out, std_err, exit_fun, env), spec_files_glob)
 end
diff --git a/src/crytic.cr b/src/crytic.cr
index f9ecd107..0a377810 100644
--- a/src/crytic.cr
+++ b/src/crytic.cr
@@ -1,14 +1,15 @@
 require "./crytic/cli"
+require "./crytic/side_effects"
 
 success = !Crytic::Cli
-  .new(STDOUT, STDERR, ->(code : Int32) { exit(code) }, {
+  .new(Crytic::SideEffects.new(STDOUT, STDERR, ->(code : Int32) { exit(code) }, {
   # manually map from ENV to a Hash because I am unable to conform ENV
   # to anything that I can replace with a stub in the tests
   "CIRCLE_BRANCH"             => ENV["CIRCLE_BRANCH"]? || "",
   "CIRCLE_PROJECT_REPONAME"   => ENV["CIRCLE_PROJECT_REPONAME"]? || "",
   "CIRCLE_PROJECT_USERNAME"   => ENV["CIRCLE_PROJECT_USERNAME"]? || "",
   "STRYKER_DASHBOARD_API_KEY" => ENV["STRYKER_DASHBOARD_API_KEY"]? || "",
-})
+}))
   .run(ARGV)
 
 exit(success.to_unsafe)
diff --git a/src/crytic/cli.cr b/src/crytic/cli.cr
index 1de8d315..4bbd7c65 100644
--- a/src/crytic/cli.cr
+++ b/src/crytic/cli.cr
@@ -2,16 +2,12 @@ require "./cli_options"
 require "./generator/in_memory_generator"
 require "./generator/isolated_mutation_factory"
 require "./runner/sequential"
+require "./side_effects"
 require "./subject"
 
 module Crytic
   class Cli
-    def initialize(
-      @std_out : IO,
-      @std_err : IO,
-      @exit_fun : (Int32) ->,
-      @env : Hash(String, String)
-    )
+    def initialize(@side_effects : SideEffects)
     end
 
     def run(args)
@@ -25,7 +21,7 @@ module Crytic
 
     private def parse_options(args)
       Crytic::CliOptions
-        .new(@std_out, @std_err, @exit_fun, @env, Crytic::CliOptions::DEFAULT_SPEC_FILES_GLOB)
+        .new(@side_effects, Crytic::CliOptions::DEFAULT_SPEC_FILES_GLOB)
         .parse(args)
     end
 
diff --git a/src/crytic/cli_options.cr b/src/crytic/cli_options.cr
index fc67e11a..91b1b838 100644
--- a/src/crytic/cli_options.cr
+++ b/src/crytic/cli_options.cr
@@ -1,6 +1,7 @@
 require "./generator/generator"
 require "./mutant/possibilities"
 require "./reporter/*"
+require "./side_effects"
 require "option_parser"
 
 module Crytic
@@ -13,14 +14,8 @@ module Crytic
     @spec_files = [] of String
     @subject = [] of String
 
-    def initialize(
-      @std_out : IO,
-      @std_err : IO,
-      @exit_fun : (Int32) ->,
-      @env : Hash(String, String),
-      @spec_files_glob : String
-    )
-      @reporters << Reporter::IoReporter.new(@std_out)
+    def initialize(@side_effects : SideEffects, @spec_files_glob : String)
+      @reporters << Reporter::IoReporter.new(@side_effects.std_out)
     end
 
     def parse(args)
@@ -28,8 +23,8 @@ module Crytic
         parser.banner = "Usage: crytic [arguments]"
 
         parser.on("-h", "--help", "Show this help") do
-          @std_out.puts parser
-          @exit_fun.call(0)
+          @side_effects.std_out.puts parser
+          @side_effects.exit_fun.call(0)
         end
 
         parser.on("-m", "--min-msi=THRESHOLD", "Crytic will exit with zero if this threshold is reached.") do |threshold|
@@ -57,9 +52,9 @@ module Crytic
         end
 
         parser.invalid_option do |flag|
-          @std_err.puts "ERROR: #{flag} is not a valid option."
-          @std_err.puts parser
-          @exit_fun.call(1)
+          @side_effects.std_err.puts "ERROR: #{flag} is not a valid option."
+          @side_effects.std_err.puts parser
+          @side_effects.exit_fun.call(1)
         end
       end
 
@@ -87,16 +82,16 @@ module Crytic
     end
 
     private def console_reporter
-      Reporter::IoReporter.new(@std_out)
+      Reporter::IoReporter.new(@side_effects.std_out)
     end
 
     private def stryker_reporter
       client = Reporter::DefaultHttpClient.new
-      Reporter::StrykerBadgeReporter.new(client, @env, @std_out)
+      Reporter::StrykerBadgeReporter.new(client, @side_effects.env, @side_effects.std_out)
     end
 
     private def file_summary_reporter
-      Reporter::FileSummaryIoReporter.new(@std_out)
+      Reporter::FileSummaryIoReporter.new(@side_effects.std_out)
     end
   end
 end
diff --git a/src/crytic/side_effects.cr b/src/crytic/side_effects.cr
new file mode 100644
index 00000000..3a87d7f3
--- /dev/null
+++ b/src/crytic/side_effects.cr
@@ -0,0 +1,9 @@
+class Crytic::SideEffects
+  getter std_out : IO
+  getter std_err : IO
+  getter exit_fun : (Int32) ->
+  getter env : Hash(String, String)
+
+  def initialize(@std_out, @std_err, @exit_fun, @env)
+  end
+end