diff --git a/.dockerignore b/.dockerignore
index cc86e3f0..6e57e57f 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -6,4 +6,4 @@
 !script/build/debian/*.sh
 !Rakefile
 !config/*
-!db/*
\ No newline at end of file
+!gems/*
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index cd9f4edb..04cefe63 100755
--- a/Gemfile
+++ b/Gemfile
@@ -47,8 +47,7 @@ gem 'dalli'
 gem 'memcachier'
 
 
-gem 'param_validation', git: 'https://github.com/commitchange/ruby-param-validation.git'
-#gem 'param_validation', path: '../ruby-param-validation'
+gem 'param_validation', path: 'gems/ruby-param-validation'
 
 # Print colorized text lol
 gem 'colorize'
diff --git a/Gemfile.lock b/Gemfile.lock
index 3d0c1352..f64bf4ee 100755
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,10 +1,3 @@
-GIT
-  remote: https://github.com/commitchange/ruby-param-validation.git
-  revision: 4269cdef83eb95eea749f05c22a9b747b8f1f256
-  specs:
-    param_validation (0.0.2)
-      chronic
-
 GIT
   remote: https://github.com/commitchange/ruby-qx.git
   revision: 3c7fbb9c844e3ea86c9faea204058aa76e5ea35d
@@ -41,6 +34,12 @@ GIT
       activesupport (>= 3.0.0)
       multi_json (>= 1.3.2)
 
+PATH
+  remote: gems/ruby-param-validation
+  specs:
+    param_validation (0.0.2)
+      chronic
+
 GEM
   remote: https://rubygems.org/
   specs:
diff --git a/docker/build/Dockerfile b/docker/build/Dockerfile
index c1d27269..c398038f 100644
--- a/docker/build/Dockerfile
+++ b/docker/build/Dockerfile
@@ -9,6 +9,7 @@ COPY script/build/debian/postgres.sh myapp/script/build/debian/postgres.sh
 RUN myapp/script/build/debian/postgres.sh
 COPY script/build/debian/java.sh myapp/script/build/debian/java.sh
 RUN myapp/script/build/debian/java.sh
+COPY gems /myapp/gems/
 WORKDIR /myapp
 COPY Gemfile /myapp/Gemfile
 COPY Gemfile.lock /myapp/Gemfile.lock
diff --git a/docker/debug/Dockerfile b/docker/debug/Dockerfile
index 5c8d5468..63f7a0bb 100644
--- a/docker/debug/Dockerfile
+++ b/docker/debug/Dockerfile
@@ -9,6 +9,7 @@ COPY script/build/debian/postgres.sh myapp/script/build/debian/postgres.sh
 RUN myapp/script/build/debian/postgres.sh
 COPY script/build/debian/java.sh myapp/script/build/debian/java.sh
 RUN myapp/script/build/debian/java.sh
+COPY gems /myapp/gems/
 WORKDIR /myapp
 RUN groupadd -r -g 1000 $USER
 RUN useradd -r -m -g $USER -u 1000 $USER
diff --git a/gems/ruby-param-validation/LICENSE b/gems/ruby-param-validation/LICENSE
new file mode 100644
index 00000000..54c81cba
--- /dev/null
+++ b/gems/ruby-param-validation/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 Jay R Bolton, CommitChange
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/gems/ruby-param-validation/README.md b/gems/ruby-param-validation/README.md
new file mode 100644
index 00000000..bd2bb41c
--- /dev/null
+++ b/gems/ruby-param-validation/README.md
@@ -0,0 +1,162 @@
+# ParamValidation
+
+A standalone and simple ruby hash validation lib, useful for validating the data passed to your functions. 
+
+```rb
+new_charge_validation = {
+  amount: {
+    required: true
+  },
+  stripe_card_token: {
+    required: true,
+    format: /^tok_.*$/
+  }
+}
+
+def update_database(data)
+  ParamValidation.new(data, new_charge_validation)
+  # do stuff
+  return result
+end
+```
+
+The above checks the `:amount` and `:stripe_card_token` keys inside the `data`
+hash and runs validations on them. If a value is invalid, an exception is
+thrown. The exception can be handled outside your function call, typically in a
+controller/router or in a test suite.
+
+An exception is thrown for each failure.
+
+## ParamValidation::Error
+
+The ParamValidation::Error object has the following information on it:
+
+```rb
+begin 
+  update_database(data)
+rescue ParamValidation::Error => e
+  e.message # string validation failure message
+  e.val     # value that failed validation
+  e.key     # key name of the above value inside the data hash
+  e.name    # name of the validator that failed
+rescue Exception => e
+  # a non-validation exception
+end
+```
+
+## Using in Rails
+
+To handle validation exceptions from the controller, you can add a custom helper function in your ApplicationController like this:
+
+```rb
+def render_json(&block)
+  begin
+    result = yield block
+  rescue ParamValidation::Error => e
+    return {status: 422, json: {error: e.message, key: e.key}}
+  rescue Error => e # a non-validation related exception
+    return {status: 500, json: e}
+  end
+  return {status: 200, json: result}
+end
+```
+
+With the above, you can simply call render_json on your validated function call:
+
+```rb
+UsersController < ApplicationController
+  def update
+    render_json{ update_user(params[:user]) }
+  end
+end
+```
+
+```rb
+update_validation = {
+  email: {
+    presence: :optional,
+    format: email_regex
+  }
+}
+
+def update_user(params)
+  ParamValidation.new(params, update_validation)
+end
+```
+
+### built-in validators
+
+- required: value must be non-nil
+- absent: value must be nil
+- not_included_in: value must not be in array
+- included_in: value must be in array
+- format: value must match regex
+- is_integer: value must look like an integer (can be a string)
+- is_float: value must look like a float (can be a string)
+- min_length: array value must have length >= min
+- max_length: array value must have length <= max
+- length_range: array value must have length within given range
+- length_equals: array value length must equal given arg
+- equals: value must equal given arg
+- min: value must be >= arg
+- max: value must be <= arg
+- in_range: value must be within the given range
+
+### custom validators
+
+ParamValidation.add_validator takes a name and a block. That block performs the
+validations and simply returns true/false. The block takes three params: the
+actual value to validate, and the argument provided in the validation hash, and
+the entire data hash being validated.
+
+```rb
+# You can use other validators inside a new validator
+ParamValidation.add_validator(:dollars) do |val, arg, data|
+  ParamValidation.validators[:format](val, /^\$\d+\.(\d\d)$?, data)
+end
+
+# # Validators that don't need an argument typically just get 'true' passed in
+# ParamValidation.new(params, { 
+#   amount: { dollars: true }
+# })
+
+# Other examples
+
+# Uniqueness validation (of course it may be better to use the UNIQUE constraint in sql)
+ParamValidation.add_validator(:unique) do |val, arg, data|
+  Qx.select("COUNT(*)").from(:table).where(name: val).first['count'] == 0
+end
+```
+
+### custom validation messages
+
+Within a validation instance, you can set a custom message with the :message key.
+
+```rb
+ParamValidation.new(params, {
+  amount: {
+    dollars: true,
+    message: 'Please enter a dollar amount'
+  }
+})
+```
+
+To change the global default message, simply use ParamValidation.set_message(:validation_name, &block).
+
+```rb
+ParamValidation.set_message(:dollars) do |h|
+  "#{h[:key]} must be in dollars"
+end
+```
+
+The `set_message` block receives a hash with some data:
+
+* :key  - name of the key in the hash that failed this validation
+* :arg  - argument to validator (eg format regex)
+* :val  - actual value that failed validation
+* :data - entire data hash that is being validated
+
+
+#### internationalization -- TODO!
+
+Internationalization support is not yet in place; please make a PR for it!
diff --git a/gems/ruby-param-validation/Rakefile b/gems/ruby-param-validation/Rakefile
new file mode 100644
index 00000000..1f33d053
--- /dev/null
+++ b/gems/ruby-param-validation/Rakefile
@@ -0,0 +1,9 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << 'test'
+  t.test_files = FileList['test/test*.rb', 'test/*test.rb']
+end
+
+desc "Run tests"
+task :default => :test
\ No newline at end of file
diff --git a/gems/ruby-param-validation/lib/param_validation.rb b/gems/ruby-param-validation/lib/param_validation.rb
new file mode 100644
index 00000000..131ffc31
--- /dev/null
+++ b/gems/ruby-param-validation/lib/param_validation.rb
@@ -0,0 +1,130 @@
+require 'json'
+require 'chronic'
+
+class ParamValidation
+
+  # Given a hash of data and a validation hash, check all the validations, raising an Error on the first invalid key
+  # @raise [ValidationError] if one or more of the validations fail.
+  def initialize(data, validations)
+    errors = []
+    validations.each do |key, validators|
+      val = key === :root ? data : (data[key] || data[key.to_s] || data[key.to_sym])
+      next if validators[:required].nil? && val.nil?
+      validators.each do |name, arg|
+        validator = @@validators[name]
+        msg = validations[key][:message]
+        next unless validator
+        is_valid = @@validators[name].call(val, arg, data)
+        msg_proc = @@messages[name]
+        msg ||= @@messages[name].call({key: key, data: data, val: val, arg: arg}) if msg_proc
+        errors.push({msg: msg, data: {key: key, val: val, name: name, msg: msg}}) unless is_valid
+      end
+    end
+    if errors.length == 1
+      raise ValidationError.new(errors[0][:msg], errors[0][:data])
+    elsif errors.length > 1
+      msg = errors.collect {|e| e[:msg]}.join('\n')
+      raise ValidationError.new(msg, errors.collect{|e| e[:data]})
+    end
+  end
+
+  def self.messages; @@messages; end
+  def self.set_message(name, &block)
+    @@messages[name] = block
+  end
+
+  def self.validators; @@validators; end
+  def self.add_validator(name, &block)
+    @@validators[name] = block
+  end
+  def self.structure_validators; @@structure_validators; end
+  def self.add_structure_validator(name, &block)
+    @@structure_validators[name] = block
+  end
+
+  # In each Proc
+  #  - val is the value we are actually validating from the data passed in
+  #  - arg is the argument passed into the validator (eg for {required: true}, it is `true`)
+  #  - data is the entire set of data
+  @@validators = {
+    required:  lambda {|val, arg, data| !val.nil?},
+    absent: lambda {|val, arg, data| val.nil?},
+    not_blank: lambda {|val, arg, data| val.is_a?(String) && val.length > 0},
+    not_included_in: lambda {|val, arg, data| !arg.include?(val) rescue false},
+    included_in: lambda {|val, arg, data| arg.include?(val) rescue false},
+    format: lambda {|val, arg, data| val =~ arg rescue false},
+    is_integer: lambda {|val, arg, data| val.is_a?(Integer) || val =~ /\A[+-]?\d+\Z/},
+    is_float: lambda {|val, arg, data| val.is_a?(Float) || (!!Float(val) rescue false) },
+    min_length: lambda {|val, arg, data| val.length >= arg rescue false},
+    max_length: lambda {|val, arg, data| val.length <= arg rescue false},
+    length_range: lambda {|val, arg, data| arg.cover?(val.length) rescue false},
+    length_equals: lambda {|val, arg, data| val.length == arg},
+    is_reference: lambda{|val, arg, data| (val.is_a?(Integer)&& val >=0) || val =~ /\A\d+\Z/ || val == ''},
+    equals: lambda {|val, arg, data| val == arg},
+    min: lambda {|val, arg, data| val >= arg rescue false},
+    max: lambda {|val, arg, data| val <= arg rescue false},
+    is_array: lambda {|val, arg, data| val.is_a?(Array)},
+    is_hash: lambda {|val, arg, data| val.is_a?(Hash)},
+    is_json: lambda {|val, arg, data| ParamValidation.is_valid_json?(val)},
+    in_range: lambda {|val, arg, data| arg.cover?(val) rescue false},
+    is_a: lambda {|val, arg, data| arg.kind_of?(Enumerable) ? arg.any? {|i| val.is_a?(i)} : val.is_a?(arg)},
+    can_be_date: lambda {|val, arg, data| val.is_a?(Date) || val.is_a?(DateTime) || Chronic.parse(val)},
+    array_of_hashes: lambda {|val, arg, data| data.is_a?(Array) && data.map{|pair| ParamValidation.new(pair.to_h, arg)}.all?}
+  }
+
+  @@messages = {
+    required: lambda {|h| "#{h[:key]} is required"},
+    absent: lambda {|h| "#{h[:key]} must not be present"},
+    not_blank: lambda {|h| "#{h[:key]} must not be blank"},
+    not_included_in: lambda {|h| "#{h[:key]} must not be included in #{h[:arg].join(", ")}"},
+    included_in: lambda {|h|"#{h[:key]} must be one of #{h[:arg].join(", ")}"},
+    format: lambda {|h|"#{h[:key]} doesn't have the right format"},
+    is_integer: lambda {|h|"#{h[:key]} should be an integer"},
+    is_float: lambda {|h|"#{h[:key]} should be a float"},
+    min_length: lambda {|h|"#{h[:key]} has a minimum length of #{h[:arg]}"},
+    max_length: lambda {|h|"#{h[:key]} has a maximum length of #{h[:arg]}"},
+    length_range: lambda {|h|"#{h[:key]} should have a length within #{h[:arg]}"},
+    length_equals: lambda {|h|"#{h[:key]} should have a length of #{h[:arg]}"},
+    is_reference: lambda{|h| "#{h[:key]} should be an integer or blank"},
+    equals: lambda {|h|"#{h[:key]} should equal #{h[:arg]}"},
+    min: lambda {|h|"#{h[:key]} must be at least #{h[:arg]}"},
+    max: lambda {|h|"#{h[:key]} cannot be more than #{h[:arg]}"},
+    in_range: lambda {|h|"#{h[:key]} should be within #{h[:arg]}"},
+    is_json: lambda {|h| "#{h[:key]} should be valid JSON"},
+    is_hash: lambda {|h| "#{h[:key]} should be a hash"},
+    is_a: lambda  {|h| "#{h[:key]} should be of the type(s): #{h[:arg].kind_of?(Enumerable) ? h[:arg].join(', '): h[:arg]}"},
+    can_be_date: lambda  {|h| "#{h[:key]} should be a datetime or be parsable as one"},
+    array_of_hashes: lambda {|h| "Please pass in an array of hashes"}
+  }
+
+  # small utility for testing json validity
+  def self.is_valid_json?(str)
+    begin
+      JSON.parse(str)
+      return true
+    rescue => e
+      return false
+    end
+  end
+
+  # Special error class that holds all the error data for reference
+  class ValidationError < TypeError
+    attr_reader :data
+
+    # @param [String] msg message for the validation error(s). Multiple error
+    #   messages are split by new lines (\n)
+    # @param [Hash, Array<Hash>] data information about the validation failure
+    #   or failures. If one failure, a single failure hash is returned, if multiple, an array is returned.
+    #   Each failure hash has the following:
+    #     * :key - the [Symbol] of the key in the hash where verification failed
+    #     * :val - the value of pair in the hash selected by :key
+    #     * :name - the [Symbol] for the verification which failed
+    #     * :msg - the [String] for the msg for the verifications which failed
+    def initialize(msg, data)
+      @data = data
+      super(msg)
+    end
+  end
+
+end
+
diff --git a/gems/ruby-param-validation/param_validation.gemspec b/gems/ruby-param-validation/param_validation.gemspec
new file mode 100644
index 00000000..56d8931f
--- /dev/null
+++ b/gems/ruby-param-validation/param_validation.gemspec
@@ -0,0 +1,14 @@
+Gem::Specification.new do |s|
+  s.name = 'param_validation'
+  s.version = '0.0.2'
+  s.date = '2017-07-21'
+  s.summary = 'Simple hash validator'
+  s.description = 'A hash validator that throws exceptions, with a lot of customization options'
+  s.authors = ['Jay R Bolton']
+  s.email = 'jayrbolton@gmail.com'
+  s.files = 'lib/param_validation.rb'
+  s.homepage = 'https://github.com/jayrbolton/ruby-param-validation'
+  s.license = 'MIT'
+
+  s.add_runtime_dependency 'chronic'
+end
diff --git a/gems/ruby-param-validation/test/param_validation_test.rb b/gems/ruby-param-validation/test/param_validation_test.rb
new file mode 100644
index 00000000..a58262ef
--- /dev/null
+++ b/gems/ruby-param-validation/test/param_validation_test.rb
@@ -0,0 +1,215 @@
+require './lib/param_validation.rb'
+require 'minitest/autorun'
+
+class ParamValidationTest < Minitest::Test
+
+  def setup
+  end
+
+  def test_required
+    begin; ParamValidation.new({}, {x: {required: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  # If a key is not required, then don't run the tests on it
+  def test_not_required_and_absent_then_tests_do_not_run
+    ParamValidation.new({}, {x: {max: 100}})
+    assert true
+  end
+  def test_not_blank_fail
+    begin; ParamValidation.new({x: ''}, {x: {not_blank: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_not_blank_fail_nil
+    begin; ParamValidation.new({x: nil}, {x: {not_blank: true, required: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert(e.data.one?{|i| i[:name] == :not_blank && i[:key] == :x})
+    assert(e.data.one?{|i| i[:name] == :required && i[:key] == :x})
+  end
+  def test_not_blank_succeed
+    ParamValidation.new({x: 'x'}, {x: {not_blank: true}})
+    assert true
+  end
+  def test_require_no_err
+    begin; ParamValidation.new({x: 1}, {x: {required: true}})
+    rescue ParamValidation::ValidationError => e; end
+    assert e.nil?
+  end
+  def test_absent
+    begin; ParamValidation.new({x: 1}, {x: {absent: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_not_included_in
+    begin; ParamValidation.new({x: 1}, {x: {not_included_in: [1]}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_included_in
+    begin; ParamValidation.new({x: 1}, {x: {included_in: [2]}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_format
+    begin; ParamValidation.new({x: 'x'}, {x: {format: /y/}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+
+  def test_is_reference_string
+    begin; ParamValidation.new({x: '-0'}, {x: {is_reference: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+
+  def test_is_reference_negative_integer
+    begin; ParamValidation.new({x: -1}, {x: {is_reference: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+
+  def test_is_reference_passes
+    ParamValidation.new({x: '0'}, {x: {is_reference: true}})
+    ParamValidation.new({x: 1}, {x: {is_reference: true}})
+    ParamValidation.new({x: ''}, {x: {is_reference: true}})
+    pass()
+  end
+
+  def test_is_integer
+    begin; ParamValidation.new({x: 'x'}, {x: {is_integer: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_is_float
+    begin; ParamValidation.new({x: 'x'}, {x: {is_float: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_min_length
+    begin; ParamValidation.new({x: []}, {x: {min_length: 2}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal :x, e.data[:key]
+  end
+  def test_max_length
+    begin; ParamValidation.new({x: [1,2,3]}, {x: {max_length: 2}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:key], :x
+  end
+  def test_length_range
+    begin; ParamValidation.new({x: [1,2,3,4]}, {x: {length_range: 1..3}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:key], :x
+  end
+  def test_length_equals
+    begin; ParamValidation.new({x: [1,2]}, {x: {length_equals: 1}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:key], :x
+  end
+  def test_min
+    begin; ParamValidation.new({x: 1}, {x: {min: 2}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:key], :x
+  end
+  def test_max
+    begin; ParamValidation.new({x: 4}, {x: {max: 2}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:name], :max
+  end
+  def test_in_range
+    begin; ParamValidation.new({x: 1}, {x: {in_range: 2..4}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal e.data[:val], 1
+  end
+  def test_equals
+    begin; ParamValidation.new({x: 1}, {x: {equals: 2}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal "x should equal #{2}", e.to_s
+  end
+  def test_root_array_of_hashes
+    begin; ParamValidation.new({x: 1}, {root: {array_of_hashes: {x: {required: true}}}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal "Please pass in an array of hashes", e.to_s
+  end
+  def test_root_array_of_hashes_with_nesting_ok
+    v = ParamValidation.new([{'x' => 1}, {x: 1}], {root: {array_of_hashes: {x: {is_integer: true}}}})
+    assert_equal v, v # test that it does not raise
+  end
+  def test_root_array_of_hashes_with_nesting
+    begin; ParamValidation.new([{x: 1}, {x: 'hi'}], {root: {array_of_hashes: {x: {is_integer: true}}}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal "x should be an integer", e.to_s
+  end
+
+  def test_is_json_with_string
+    begin; ParamValidation.new({x: '[[[[[[['}, {x: {is_json: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal "x should be valid JSON", e.to_s
+  end
+
+  def test_is_json_without_string
+    begin; ParamValidation.new({x: {}}, {x: {is_json: true}})
+    rescue ParamValidation::ValidationError => e; e; end
+    assert_equal "x should be valid JSON", e.to_s
+  end
+
+  def test_is_a_single
+    ParamValidation.new({x: 5.6}, {x: {is_a: Float}})
+    begin
+      ParamValidation.new({x: 5.6}, {x: {is_a: Integer}})
+    rescue ParamValidation::ValidationError => e
+      e
+    end
+    assert_equal 'x should be of the type(s): Integer', e.to_s
+  end
+
+
+  def test_is_a_multiple
+    ParamValidation.new({x: 5.6}, {x: {is_a: [Integer,Float]}})
+    begin
+      ParamValidation.new({x: 5.6}, {x: {is_a: [Integer, Array]}})
+    rescue ParamValidation::ValidationError => e
+      e
+    end
+
+    assert_equal 'x should be of the type(s): Integer, Array', e.to_s
+  end
+
+  def test_can_be_date
+    ParamValidation.new({x: Date.new()}, {x: {can_be_date: true}})
+    ParamValidation.new({x: DateTime.new()}, {x: {can_be_date: true}})
+    ParamValidation.new({x: '2017-05-15T12:00:00.000Z'}, {x: {can_be_date: true}})
+    ParamValidation.new({x: '2017-05-15'}, {x: {can_be_date: true}})
+
+    begin
+      ParamValidation.new({x: 'not_a _date'}, {x: {can_be_date: true}})
+    rescue ParamValidation::ValidationError => e
+      e
+    end
+
+    assert_equal 'x should be a datetime or be parsable as one', e.to_s
+  end
+
+  def test_add_validator
+    ParamValidation.add_validator(:dollars){|val, arg, data| val =~ /^\d+(\.\d\d)?$/}
+    begin
+      ParamValidation.new({x: 'hi'}, {x: {dollars: true}})
+    rescue ParamValidation::ValidationError => e
+      e
+    end
+    assert_equal :dollars, e.data[:name]
+  end
+  def test_set_message
+    ParamValidation.add_validator(:dollars){|val, arg, data| val =~ /^\d+(\.\d\d)?$/}
+    ParamValidation.set_message(:dollars){|h| "#{h[:key]} must be a dollar amount"}
+    begin
+      ParamValidation.new({x: 'hi'}, {x: {dollars: true}})
+    rescue ParamValidation::ValidationError => e
+      e
+    end
+    assert_equal "x must be a dollar amount", e.to_s
+  end
+
+  def test_custom_validator
+  end
+end