diff --git a/.gitignore b/.gitignore
index 8d6a243f..4c446720 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.rbc
 /.config
 /coverage/
+.ds_store
 /InstalledFiles
 /pkg/
 /spec/reports/
@@ -11,7 +12,7 @@
 /tmp/
 
 # Used by dotenv library to load environment variables.
-# .env
+.env
 
 ## Specific to RubyMotion:
 .dat*
diff --git a/lib/channel.rb b/lib/channel.rb
new file mode 100644
index 00000000..05d99bae
--- /dev/null
+++ b/lib/channel.rb
@@ -0,0 +1,34 @@
+require_relative "recipient"
+require "httparty"
+require 'pry'
+
+module Slack
+  class Channel < Recipient
+    attr_reader :topic, :member_count
+    
+    def initialize(slack_id, name, topic = nil, member_count)
+      super(slack_id, name)
+      @topic = topic
+      @member_count = member_count
+    end
+    
+    def details
+      tp self, "slack_id", "name", "topic", "member_count"
+    end
+    
+    def self.list
+      response = Channel.get("https://slack.com/api/conversations.list")
+      channels = []
+      
+      response["channels"].each do |channel|
+        channels << Channel.new(
+          slack_id = channel["id"],
+          name = channel["name"],
+          topic = channel["topic"]["value"],
+          member_count = channel["num_members"],
+        )
+      end
+      return channels
+    end 
+  end
+end
diff --git a/lib/recipient.rb b/lib/recipient.rb
new file mode 100644
index 00000000..354a28a1
--- /dev/null
+++ b/lib/recipient.rb
@@ -0,0 +1,38 @@
+require "httparty"
+require 'pry'
+
+class API_Error < StandardError
+end
+module Slack
+  class Recipient
+    URL = "https://slack.com/api/users.list"
+    attr_reader :slack_id, :name
+    
+    def initialize(slack_id, name)
+      @slack_id = slack_id
+      @name = name
+    end
+    
+    def details
+      raise API_Error.new, 'Implement me in a child class!'
+    end
+    
+    def self.list
+      raise API_Error.new, 'Implement me in a child class!'
+    end
+    
+    def self.get(url)     
+      response = HTTParty.get(url, query: {token: ENV['SLACK_API_TOKEN']})
+      return response
+    end
+    
+    def send_message(slack_id, message)
+      response = HTTParty.post("https://slack.com/api/chat.postMessage", query: {token: ENV['SLACK_API_TOKEN'], channel: slack_id, text: message})
+      
+      unless response.code ==  200
+        raise ExceptionError, "Message not sent."
+      end 
+      return response
+    end
+  end  
+end
diff --git a/lib/slack.rb b/lib/slack.rb
index 960cf2f7..21ac41ca 100755
--- a/lib/slack.rb
+++ b/lib/slack.rb
@@ -1,11 +1,77 @@
-#!/usr/bin/env ruby
+require "dotenv"
+require "httparty"
+require "table_print"
 
-def main
-  puts "Welcome to the Ada Slack CLI!"
+require_relative "recipient"
+require_relative "user"
+require_relative "channel"
+require_relative "workspace"
 
-  # TODO project
+Dotenv.load
 
-  puts "Thank you for using the Ada Slack CLI"
+def main
+  workspace = Slack::Workspace.new 
+  puts "\n"
+  puts "Welcome to the Ada Slack CLI! This Slack workspace currently has #{workspace.users.count} users and #{workspace.channels.count} channels. Press enter to continue."
+  
+  user_input = gets.chomp
+  
+  until user_input == "quit"  
+    print "Please choose an option: list users, list channels, select user, select channel, details, send message, or quit: "
+    user_input = gets.chomp.downcase
+    
+    case user_input
+    when "list users"
+      tp workspace.users, "slack_id", "name", "real_name" 
+      puts "\n"
+      user_input = nil
+      
+    when "list channels"
+      tp workspace.channels, "name", "topic", "member_count", "slack_id"
+      puts "\n"
+      user_input = nil
+      
+    when "select user"
+      print "Please enter the user name or ID: "
+      name_or_id = gets.chomp
+      puts workspace.select(name_or_id)
+      puts "\n"
+      
+    when "select channel"
+      print "Please enter the channel name or ID: "
+      name_or_id = gets.chomp
+      puts workspace.select(name_or_id)
+      puts "\n"
+      
+    when "details"
+      if workspace.selected == nil
+        puts "Please select a user or channel."
+        user_input = nil
+        puts "\n"
+      else
+        workspace.show_details
+        user_input = nil
+        puts "\n"
+      end 
+    when "send message"
+      if workspace.selected == nil
+        puts "Please select a user or channel."
+        user_input = nil
+        puts "\n"
+      else
+        print "Please enter your message: "
+        message = gets.chomp
+        slack_id = workspace.select(name_or_id)
+        workspace.user_message(message, slack_id)
+        puts "\n"
+      end
+    else
+      puts "Sorry, I didn't understand your request. Please try again."
+      puts "\n"
+    end
+  end 
+  puts "Thank you for using the ADA Slack CLI!"
+  puts "\n"
 end
 
-main if __FILE__ == $PROGRAM_NAME
\ No newline at end of file
+main if __FILE__ == $PROGRAM_NAME
diff --git a/lib/user.rb b/lib/user.rb
new file mode 100644
index 00000000..515a6147
--- /dev/null
+++ b/lib/user.rb
@@ -0,0 +1,32 @@
+require_relative "recipient"
+require "httparty"
+require 'pry'
+
+module Slack
+  class User < Recipient
+    attr_reader :real_name
+    
+    def initialize(slack_id, name, real_name)
+      super(slack_id, name)
+      @real_name = real_name
+    end
+    
+    def details
+      tp self, "slack_id", "name", "real_name"
+    end 
+    
+    def self.list   
+      response = User.get("https://slack.com/api/users.list")
+      users = []
+      
+      response["members"].each do |user|
+        users << User.new(
+          slack_id = user["id"],
+          name = user["name"],
+          real_name = user["real_name"],
+        )
+      end
+      return users
+    end 
+  end
+end
diff --git a/lib/workspace.rb b/lib/workspace.rb
new file mode 100644
index 00000000..d0e8a6e6
--- /dev/null
+++ b/lib/workspace.rb
@@ -0,0 +1,41 @@
+require_relative "user"
+require_relative "channel"
+
+module Slack
+  class Workspace
+    attr_reader :users, :channels, :selected
+    
+    def initialize
+      @users = User.list
+      @channels = Channel.list
+      @selected = nil
+    end
+    
+    def select(name_or_id)
+      @channels.each do |channel|
+        if channel.name == name_or_id || channel.slack_id == name_or_id
+          @selected = channel
+          return "Okay, #{@selected.name} is selected."
+        else 
+          @users.each do |user|
+            if user.name == name_or_id || user.slack_id == name_or_id
+              @selected = user
+              return "Okay, #{@selected.name} is selected." 
+            end
+          end
+        end  
+      end
+      puts "Sorry, I couldn't find that user or channel."
+    end
+    
+    def show_details
+      return @selected.details
+    end
+    
+    def user_message(message, slack_id)
+      @selected.send_message(@selected.slack_id, message)
+      return "Success! Message sent to #{@selected.name}."      
+    end 
+    
+  end
+end
diff --git a/test/cassettes/channel-info.yml b/test/cassettes/channel-info.yml
new file mode 100644
index 00000000..26169781
--- /dev/null
+++ b/test/cassettes/channel-info.yml
@@ -0,0 +1,84 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: https://slack.com/api/conversations.list?token=SLACK_API_TOKEN
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '736'
+      Connection:
+      - keep-alive
+      Date:
+      - Sat, 14 Sep 2019 22:14:10 GMT
+      Server:
+      - Apache
+      X-Content-Type-Options:
+      - nosniff
+      X-Slack-Req-Id:
+      - 5adecfe4-0df6-4f44-8961-cbf25b1fb0e8
+      X-Oauth-Scopes:
+      - identify,channels:read,users:read,chat:write:bot
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Access-Control-Expose-Headers:
+      - x-slack-req-id, retry-after
+      X-Xss-Protection:
+      - '0'
+      X-Accepted-Oauth-Scopes:
+      - channels:read,groups:read,mpim:read,im:read,read
+      Vary:
+      - Accept-Encoding
+      Pragma:
+      - no-cache
+      Access-Control-Allow-Headers:
+      - slack-route, x-slack-version-ts
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Referrer-Policy:
+      - no-referrer
+      Access-Control-Allow-Origin:
+      - "*"
+      X-Via:
+      - haproxy-www-1ir4
+      X-Cache:
+      - Miss from cloudfront
+      Via:
+      - 1.1 1f6e68152880a39d72e6bf2996cd6a61.cloudfront.net (CloudFront)
+      X-Amz-Cf-Pop:
+      - SEA19-C1
+      X-Amz-Cf-Id:
+      - RyLCQM_WwLWaeyQ5TKpGPXNBI1iYl42Q2nJt1AxfV0GJik5uH5M6iw==
+    body:
+      encoding: ASCII-8BIT
+      string: '{"ok":true,"channels":[{"id":"CMUR2JTNX","name":"random","is_channel":true,"is_group":false,"is_im":false,"created":1568071183,"is_archived":false,"is_general":false,"unlinked":0,"name_normalized":"random","is_shared":false,"parent_conversation":null,"creator":"UN5R273J8","is_ext_shared":false,"is_org_shared":false,"shared_team_ids":["TN69AJ2SU"],"pending_shared":[],"pending_connected_team_ids":[],"is_pending_ext_shared":false,"is_member":true,"is_private":false,"is_mpim":false,"topic":{"value":"Non-work
+        banter and water cooler conversation","creator":"UN5R273J8","last_set":1568071183},"purpose":{"value":"A
+        place for non-work-related flimflam, faffing, hodge-podge or jibber-jabber
+        you''d prefer to keep out of more focused work-related channels.","creator":"UN5R273J8","last_set":1568071183},"previous_names":[],"num_members":7},{"id":"CN6A88SJZ","name":"turkey","is_channel":true,"is_group":false,"is_im":false,"created":1568073346,"is_archived":false,"is_general":false,"unlinked":0,"name_normalized":"turkey","is_shared":false,"parent_conversation":null,"creator":"UMUR43REX","is_ext_shared":false,"is_org_shared":false,"shared_team_ids":["TN69AJ2SU"],"pending_shared":[],"pending_connected_team_ids":[],"is_pending_ext_shared":false,"is_member":false,"is_private":false,"is_mpim":false,"topic":{"value":"To
+        collect images of turkeys and information about turkeys","creator":"UN5R273J8","last_set":1568232705},"purpose":{"value":"to
+        collect images of turkeys and information about turkeys","creator":"UMUR43REX","last_set":1568073347},"previous_names":[],"num_members":3},{"id":"CN85BSBQF","name":"slack-cli","is_channel":true,"is_group":false,"is_im":false,"created":1568071183,"is_archived":false,"is_general":false,"unlinked":0,"name_normalized":"slack-cli","is_shared":false,"parent_conversation":null,"creator":"UN5R273J8","is_ext_shared":false,"is_org_shared":false,"shared_team_ids":["TN69AJ2SU"],"pending_shared":[],"pending_connected_team_ids":[],"is_pending_ext_shared":false,"is_member":true,"is_private":false,"is_mpim":false,"topic":{"value":"Posts
+        about the Slack CLI project","creator":"UN5R273J8","last_set":1568232665},"purpose":{"value":"Posts
+        about the Slack CLI project","creator":"UN5R273J8","last_set":1568232660},"previous_names":[],"num_members":7},{"id":"CN8FME7AS","name":"general","is_channel":true,"is_group":false,"is_im":false,"created":1568071183,"is_archived":false,"is_general":true,"unlinked":0,"name_normalized":"general","is_shared":false,"parent_conversation":null,"creator":"UN5R273J8","is_ext_shared":false,"is_org_shared":false,"shared_team_ids":["TN69AJ2SU"],"pending_shared":[],"pending_connected_team_ids":[],"is_pending_ext_shared":false,"is_member":true,"is_private":false,"is_mpim":false,"topic":{"value":"Company-wide
+        announcements and work-based matters","creator":"UN5R273J8","last_set":1568071183},"purpose":{"value":"This
+        channel is for workspace-wide communication and announcements. All members
+        are in this channel.","creator":"UN5R273J8","last_set":1568071183},"previous_names":[],"num_members":7}],"response_metadata":{"next_cursor":""}}'
+    http_version: 
+  recorded_at: Sat, 14 Sep 2019 22:14:10 GMT
+recorded_with: VCR 5.0.0
diff --git a/test/cassettes/recipient-info.yml b/test/cassettes/recipient-info.yml
new file mode 100644
index 00000000..69cde395
--- /dev/null
+++ b/test/cassettes/recipient-info.yml
@@ -0,0 +1,249 @@
+---
+http_interactions:
+- request:
+    method: post
+    uri: https://slack.com/api/chat.postMessage?channel=USLACKBOT&text=Woe%20upon%20your%20Cylon%20heart.&token=SLACK_API_TOKEN
+    body:
+      encoding: UTF-8
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '188'
+      Connection:
+      - keep-alive
+      Date:
+      - Sat, 14 Sep 2019 22:14:10 GMT
+      Server:
+      - Apache
+      X-Content-Type-Options:
+      - nosniff
+      X-Slack-Req-Id:
+      - 3c358ea1-883c-4ea6-8227-350e83f747a3
+      X-Oauth-Scopes:
+      - identify,channels:read,users:read,chat:write:bot
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Access-Control-Expose-Headers:
+      - x-slack-req-id, retry-after
+      X-Xss-Protection:
+      - '0'
+      X-Accepted-Oauth-Scopes:
+      - chat:write:bot
+      Vary:
+      - Accept-Encoding
+      Pragma:
+      - no-cache
+      Access-Control-Allow-Headers:
+      - slack-route, x-slack-version-ts
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Referrer-Policy:
+      - no-referrer
+      Access-Control-Allow-Origin:
+      - "*"
+      X-Via:
+      - haproxy-www-4phi
+      X-Cache:
+      - Miss from cloudfront
+      Via:
+      - 1.1 2e20768704c71ff3ce2e677251d27f3c.cloudfront.net (CloudFront)
+      X-Amz-Cf-Pop:
+      - SEA19-C1
+      X-Amz-Cf-Id:
+      - s_Gfs1fBeeL7UxD-XZhSGXr9z-7GMwAM6bvLaOHr5ceGPsvBdx0EFA==
+    body:
+      encoding: ASCII-8BIT
+      string: '{"ok":true,"channel":"DN8S5J2F2","ts":"1568499250.000200","message":{"type":"message","subtype":"bot_message","text":"Woe
+        upon your Cylon heart.","ts":"1568499250.000200","username":"Leaves - Julia
+        K - API Project","bot_id":"BN8FYF5UN"}}'
+    http_version: 
+  recorded_at: Sat, 14 Sep 2019 22:14:10 GMT
+- request:
+    method: get
+    uri: https://slack.com/api/users.list?token=SLACK_API_TOKEN
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '1605'
+      Connection:
+      - keep-alive
+      Date:
+      - Sat, 14 Sep 2019 22:14:10 GMT
+      Server:
+      - Apache
+      X-Content-Type-Options:
+      - nosniff
+      X-Slack-Req-Id:
+      - 2c8f6a8b-f950-46c9-901b-097ffd6e823c
+      X-Oauth-Scopes:
+      - identify,channels:read,users:read,chat:write:bot
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Access-Control-Expose-Headers:
+      - x-slack-req-id, retry-after
+      X-Xss-Protection:
+      - '0'
+      X-Accepted-Oauth-Scopes:
+      - users:read
+      Vary:
+      - Accept-Encoding
+      Pragma:
+      - no-cache
+      Access-Control-Allow-Headers:
+      - slack-route, x-slack-version-ts
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Referrer-Policy:
+      - no-referrer
+      Access-Control-Allow-Origin:
+      - "*"
+      X-Via:
+      - haproxy-www-xtep
+      X-Cache:
+      - Miss from cloudfront
+      Via:
+      - 1.1 1570d93226c1bbca2ebaad510cff3e0d.cloudfront.net (CloudFront)
+      X-Amz-Cf-Pop:
+      - SEA19-C1
+      X-Amz-Cf-Id:
+      - "-i775E1GkmDTw819JMyXKpYvN72wBDPvcpZPKpEloKQ0CIiwyleBzA=="
+    body:
+      encoding: ASCII-8BIT
+      string: '{"ok":true,"members":[{"id":"USLACKBOT","team_id":"TN69AJ2SU","name":"slackbot","deleted":false,"color":"757575","real_name":"Slackbot","tz":null,"tz_label":"Pacific
+        Daylight Time","tz_offset":-25200,"profile":{"title":"","phone":"","skype":"","real_name":"Slackbot","real_name_normalized":"Slackbot","display_name":"Slackbot","display_name_normalized":"Slackbot","fields":null,"status_text":"","status_emoji":"","status_expiration":0,"avatar_hash":"sv41d8cd98f0","always_active":true,"first_name":"slackbot","last_name":"","image_24":"https:\/\/a.slack-edge.com\/80588\/img\/slackbot_24.png","image_32":"https:\/\/a.slack-edge.com\/80588\/img\/slackbot_32.png","image_48":"https:\/\/a.slack-edge.com\/80588\/img\/slackbot_48.png","image_72":"https:\/\/a.slack-edge.com\/80588\/img\/slackbot_72.png","image_192":"https:\/\/a.slack-edge.com\/80588\/marketing\/img\/avatars\/slackbot\/avatar-slackbot.png","image_512":"https:\/\/a.slack-edge.com\/80588\/img\/slackbot_512.png","status_text_canonical":"","team":"TN69AJ2SU"},"is_admin":false,"is_owner":false,"is_primary_owner":false,"is_restricted":false,"is_ultra_restricted":false,"is_bot":false,"is_app_user":false,"updated":0},{"id":"UMTG0S5D0","team_id":"TN69AJ2SU","name":"samantha.collares","deleted":false,"color":"674b1b","real_name":"Samantha
+        Collares","tz":"America\/Los_Angeles","tz_label":"Pacific Daylight Time","tz_offset":-25200,"profile":{"title":"","phone":"","skype":"","real_name":"Samantha
+        Collares","real_name_normalized":"Samantha Collares","display_name":"Samantha
+        Collares","display_name_normalized":"Samantha Collares","status_text":"","status_emoji":"","status_expiration":0,"avatar_hash":"ge444d412eed","image_24":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=24&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-24.png","image_32":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=32&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-32.png","image_48":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=48&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-48.png","image_72":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=72&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-72.png","image_192":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=192&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-192.png","image_512":"https:\/\/secure.gravatar.com\/avatar\/e444d412eed1a77c04bbf0fb2c43d8b8.jpg?s=512&d=https%3A%2F%2Fa.slack-edge.com%2F80588%2Fimg%2Favatars%2Fuser_shapes%2Fava_0008-512.png","status_text_canonical":"","team":"TN69AJ2SU"},"is_admin":false,"is_owner":false,"is_primary_owner":false,"is_restricted":false,"is_ultra_restricted":false,"is_bot":false,"is_app_user":false,"updated":1568071698},{"id":"UMUR43REX","team_id":"TN69AJ2SU","name":"sabrina","deleted":false,"color":"e7392d","real_name":"Sabrina
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+    http_version: 
+  recorded_at: Sat, 14 Sep 2019 22:14:11 GMT
+recorded_with: VCR 5.0.0
diff --git a/test/cassettes/workspace-info.yml b/test/cassettes/workspace-info.yml
new file mode 100644
index 00000000..5a536c81
--- /dev/null
+++ b/test/cassettes/workspace-info.yml
@@ -0,0 +1,422 @@
+---
+http_interactions:
+- request:
+    method: get
+    uri: https://slack.com/api/users.list?token=SLACK_API_TOKEN
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
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+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '1605'
+      Connection:
+      - keep-alive
+      Date:
+      - Sat, 14 Sep 2019 22:14:10 GMT
+      Server:
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+      X-Content-Type-Options:
+      - nosniff
+      X-Slack-Req-Id:
+      - 8d4fcbff-4078-40fc-bdc7-e4cb34671876
+      X-Oauth-Scopes:
+      - identify,channels:read,users:read,chat:write:bot
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Access-Control-Expose-Headers:
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+      X-Xss-Protection:
+      - '0'
+      X-Accepted-Oauth-Scopes:
+      - users:read
+      Vary:
+      - Accept-Encoding
+      Pragma:
+      - no-cache
+      Access-Control-Allow-Headers:
+      - slack-route, x-slack-version-ts
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Referrer-Policy:
+      - no-referrer
+      Access-Control-Allow-Origin:
+      - "*"
+      X-Via:
+      - haproxy-www-kftm
+      X-Cache:
+      - Miss from cloudfront
+      Via:
+      - 1.1 3a6260aec53985f2e6eb8a637c47918d.cloudfront.net (CloudFront)
+      X-Amz-Cf-Pop:
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+      X-Amz-Cf-Id:
+      - bn9R2GMe7oaWV4qyguFoLww3w5BmxziLHayEqHEvdzbwLadpy7C6sg==
+    body:
+      encoding: ASCII-8BIT
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+        announcements and work-based matters","creator":"UN5R273J8","last_set":1568071183},"purpose":{"value":"This
+        channel is for workspace-wide communication and announcements. All members
+        are in this channel.","creator":"UN5R273J8","last_set":1568071183},"previous_names":[],"num_members":7}],"response_metadata":{"next_cursor":""}}'
+    http_version: 
+  recorded_at: Sat, 14 Sep 2019 22:21:27 GMT
+- request:
+    method: post
+    uri: https://slack.com/api/chat.postMessage?channel=CMUR2JTNX&text=The%20bots%20are%20pleased.&token=SLACK_API_TOKEN
+    body:
+      encoding: UTF-8
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '184'
+      Connection:
+      - keep-alive
+      Date:
+      - Sat, 14 Sep 2019 23:41:53 GMT
+      Server:
+      - Apache
+      X-Content-Type-Options:
+      - nosniff
+      X-Slack-Req-Id:
+      - eea5131a-3a11-4ae1-ae71-e9a9a0586c09
+      X-Oauth-Scopes:
+      - identify,channels:read,users:read,chat:write:bot
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Access-Control-Expose-Headers:
+      - x-slack-req-id, retry-after
+      X-Xss-Protection:
+      - '0'
+      X-Accepted-Oauth-Scopes:
+      - chat:write:bot
+      Vary:
+      - Accept-Encoding
+      Pragma:
+      - no-cache
+      Access-Control-Allow-Headers:
+      - slack-route, x-slack-version-ts
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Referrer-Policy:
+      - no-referrer
+      Access-Control-Allow-Origin:
+      - "*"
+      X-Via:
+      - haproxy-www-1m6r
+      X-Cache:
+      - Miss from cloudfront
+      Via:
+      - 1.1 36fbf419b5fa237613e1567ab33d3698.cloudfront.net (CloudFront)
+      X-Amz-Cf-Pop:
+      - SEA19
+      X-Amz-Cf-Id:
+      - 770HxniJfz-0MWPqhC1NugC6ijvB2lJX0wUJFXLthlstAYiPF32Rvg==
+    body:
+      encoding: ASCII-8BIT
+      string: '{"ok":true,"channel":"CMUR2JTNX","ts":"1568504513.000300","message":{"type":"message","subtype":"bot_message","text":"The
+        bots are pleased.","ts":"1568504513.000300","username":"Leaves - Julia K -
+        API Project","bot_id":"BN8FYF5UN"}}'
+    http_version: 
+  recorded_at: Sat, 14 Sep 2019 23:41:53 GMT
+recorded_with: VCR 5.0.0
diff --git a/test/channel_test.rb b/test/channel_test.rb
new file mode 100644
index 00000000..61518751
--- /dev/null
+++ b/test/channel_test.rb
@@ -0,0 +1,25 @@
+require_relative "test_helper"
+
+describe "Channel" do
+  describe "initialize" do
+    it "is an instance of Channel" do 
+      channel = Slack::Channel.new("abc", "random", nil, 2)
+      expect(channel).must_be_kind_of Slack::Channel
+    end
+    
+    it "checks data structures at initialize" do
+      channel = Slack::Channel.new("abc", "random", nil, 2)
+      expect(channel.name).must_be_kind_of String
+    end
+  end 
+  
+  describe "self.list" do
+    it "return an array of Channel Instances" do
+      VCR.use_cassette("channel-info") do
+        channel = Slack::Channel.list
+        expect(channel).must_be_kind_of Array
+      end
+    end 
+    
+  end
+end
diff --git a/test/recipient_test.rb b/test/recipient_test.rb
new file mode 100644
index 00000000..c4e1b74b
--- /dev/null
+++ b/test/recipient_test.rb
@@ -0,0 +1,92 @@
+require_relative "test_helper"
+
+describe "Recipient" do
+  describe "initialize" do
+    it "is an instance of Recipient" do 
+      VCR.use_cassette("recipient-info") do
+        recipient = Slack::Recipient.new(1, "spongebob")
+        expect(recipient).must_be_kind_of Slack::Recipient
+      end
+    end    
+    
+    it "checks data structures at initialize" do
+      VCR.use_cassette("recipient-info") do      
+        recipient = Slack::Recipient.new(1, "spongebob")
+        expect(recipient).must_be_kind_of Slack::Recipient
+      end
+    end
+  end
+  
+  describe "details" do
+    it "raises an error if implementation attempted within Recipient class" do
+      VCR.use_cassette("recipient-info") do      
+        recipient = Slack::Recipient.new(1, "spongebob")
+        expect{ recipient.details
+        }.must_raise API_Error
+      end
+    end
+  end
+  
+  describe "self.list" do
+    it "raises an error if implementation attempted within Recipient class" do
+      VCR.use_cassette("recipient-info") do      
+        expect{ Slack::Recipient.list
+        }.must_raise API_Error
+      end
+    end
+  end
+  
+  describe "self.get" do 
+    it "user returns instance of HTTParty" do
+      VCR.use_cassette("recipient-info") do
+        user = Slack::Recipient.get("https://slack.com/api/users.list")
+        expect(user).must_be_kind_of HTTParty::Response
+      end
+    end 
+    
+    it "channel returns an instance of HTTParty" do
+      VCR.use_cassette("recipient-info") do
+        channel = Slack::Recipient.get("https://slack.com/api/conversations.list")
+        expect(channel).must_be_kind_of HTTParty::Response
+      end
+    end 
+  end
+  
+  describe "send message" do
+    it "raises an error if invalid ID is provided" do
+      VCR.use_cassette("recipient-info") do
+        
+        slack_id = "INVALID"
+        message = "I exist only in the ether."
+        
+        expect{ Slack::Recipient.send_message(slack_id, message)
+        }.must_raise Exception
+      end
+    end 
+    
+    it "raises an error if response code isn't 200" do
+      VCR.use_cassette("recipient-info") do
+        
+        slack_id = "USLACKBOT"
+        message = "Woe upon your Cylon heart."
+        { "ok": false, "error": "too_many_attachments" }
+        
+        expect{ Slack::Recipient.send_message(slack_id, message)
+        }.must_raise Exception
+      end
+    end 
+    
+    it "returns an instance of HTTParty when successful" do
+      VCR.use_cassette("recipient-info") do
+        
+        slack_id = "USLACKBOT"
+        message = "Woe upon your Cylon heart."
+        
+        api_response = HTTParty.post("https://slack.com/api/chat.postMessage", query: {token: ENV['SLACK_API_TOKEN'], channel: slack_id, text: message})
+        
+        expect(api_response).must_be_kind_of HTTParty::Response
+      end
+    end 
+  end
+  
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 90aeb408..8af07e58 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -9,9 +9,23 @@
 require 'minitest/skip_dsl'
 require 'vcr'
 
+require_relative "../lib/recipient"
+require_relative "../lib/user"
+require_relative "../lib/channel"
+require_relative "../lib/workspace"
+require_relative "../lib/slack"
+
 Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
 
 VCR.configure do |config|
-  config.cassette_library_dir = "test/cassettes"
-  config.hook_into :webmock
+  config.cassette_library_dir = "test/cassettes" # folder where casettes will be located
+  config.hook_into :webmock # tie into this other tool called webmock
+  config.default_cassette_options = {
+    :record => :new_episodes,    # record new data when we don't have it yet
+    :match_requests_on => [:method, :uri, :body], # The http method, URI and body of a request all need to match
+  }
+  # Don't leave our token lying around in a cassette file.
+  config.filter_sensitive_data('SLACK_API_TOKEN') do
+    ENV['SLACK_API_TOKEN']
+  end
 end
diff --git a/test/user_test.rb b/test/user_test.rb
new file mode 100644
index 00000000..5f39f595
--- /dev/null
+++ b/test/user_test.rb
@@ -0,0 +1,24 @@
+require_relative "test_helper"
+
+describe "User" do 
+  describe "self.list" do 
+    it "return an array" do
+      VCR.use_cassette("user-info") do
+        user_list = Slack::User.list
+        expect(user_list).must_be_kind_of Array
+      end
+    end 
+    describe "initialize" do
+      it "is an instance of User" do 
+        user = Slack::User.new("CS50", "spongebob", "bob smith")
+        expect(user).must_be_kind_of Slack::User
+      end
+      
+      it "checks data structures at initialize" do
+        user = Slack::User.new("CS50", "spongebob", "bob smith")
+        expect(user.real_name).must_be_kind_of String
+      end
+    end 
+  end
+
+end
diff --git a/test/workspace_test.rb b/test/workspace_test.rb
new file mode 100644
index 00000000..78be2492
--- /dev/null
+++ b/test/workspace_test.rb
@@ -0,0 +1,96 @@
+require_relative "test_helper"
+
+describe "Workspace" do
+  describe "initialize" do 
+    it "is an instance of Workspace" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        expect(workspace).must_be_kind_of Slack::Workspace
+      end
+    end
+    
+    it "checks data structures at initialize" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        expect(workspace.users).must_be_kind_of Array
+      end 
+    end
+  end
+  
+  describe "select" do  
+    it "returns a string for a matching user name" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "slackbot"
+        
+        user = workspace.select(name_or_id)
+        expect(user).must_be_kind_of String
+      end
+    end
+    
+    
+    it "returns a string for a matching channel name" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "random"
+        
+        channel = workspace.select(name_or_id)
+        expect(channel).must_be_kind_of String
+      end
+    end
+    
+    it "returns a string for a matching user ID" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "USLACKBOT"
+        
+        user = workspace.select(name_or_id)
+        expect(user).must_be_kind_of String
+      end
+    end 
+    
+    it "returns a string for a matching channel ID" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "CMUR2JTNX"
+        
+        user = workspace.select(name_or_id)
+        expect(user).must_be_kind_of String
+      end
+    end 
+    
+    it "returns nil for non-matching input" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "nonexistentname"
+        user = workspace.select(name_or_id)
+        assert_nil user
+      end 
+    end 
+  end
+  
+  describe "show details" do  
+    it "returns a table for the selected user or channel" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "random"
+        @selected = workspace.select(name_or_id)
+        expect(workspace.show_details).must_be_kind_of TablePrint::Returnable
+      end
+    end
+    
+  end
+  
+  describe "user_message" do  
+    it "returns a message string when a message is sent successfully" do
+      VCR.use_cassette("workspace-info") do
+        workspace = Slack::Workspace.new
+        name_or_id = "random"
+        @selected = workspace.select(name_or_id)
+        message = "The bots are pleased."
+        slack_id = "CMUR2JTNX"
+        expect(workspace.user_message(message, slack_id)).must_be_kind_of String
+      end
+    end
+  end 
+end