diff --git a/spec/configuration_spec.rb b/spec/configuration_spec.rb
index 6dd0941d..dc65ef63 100644
--- a/spec/configuration_spec.rb
+++ b/spec/configuration_spec.rb
@@ -63,7 +63,7 @@
     end
 
     it 'should have the default value' do
-      expect(config.base_url).to eq("http://localhost")
+      expect(config.base_url).to eq('http://localhost')
     end
 
     it 'returns default value when invalid operation is passed' do
diff --git a/spec/models/call_state_spec.rb b/spec/models/call_state_spec.rb
index 55c5a6dd..41b549aa 100644
--- a/spec/models/call_state_spec.rb
+++ b/spec/models/call_state_spec.rb
@@ -118,12 +118,6 @@
     end
   end
 
-  describe '#list_invalid_properties' do
-    it 'returns list of invalid properties' do
-      expect(call_state_default.list_invalid_properties).to eq([])
-    end
-  end
-
   describe '#hash' do
     it 'returns a hash code according to attributes' do
       expect(call_state_default.hash).to be_instance_of(Integer)
@@ -136,13 +130,6 @@
     end
   end
 
-  describe '#valid?' do
-    it 'validates instances with and without attributes set' do
-      expect(call_state_default).to be_valid
-      expect(call_state_values).to be_valid
-    end
-  end
-
   describe '#eq? #==' do
     it 'returns true/false when comparing objects' do
       expect(call_state_default.eql?(Bandwidth::CallState.new)).to be true
diff --git a/spec/models/deferred_result_spec.rb b/spec/models/deferred_result_spec.rb
index e092911c..8a0c2e0b 100644
--- a/spec/models/deferred_result_spec.rb
+++ b/spec/models/deferred_result_spec.rb
@@ -43,13 +43,7 @@
       expect(deferred_result_from_hash.set_or_expired).to be true
     end
   end
-
-  describe '#list_invalid_properties' do
-    it 'returns list of invalid properties' do
-      expect(deferred_result_default.list_invalid_properties).to eq([])
-    end
-  end
-
+  
   describe '#hash' do
     it 'returns a hash code according to attributes' do
       expect(deferred_result_default.hash).to be_instance_of(Integer)
@@ -62,13 +56,6 @@
     end
   end
 
-  describe '#valid?' do
-    it 'validates instances with and without attributes set' do
-      expect(deferred_result_default).to be_valid
-      expect(deferred_result_values).to be_valid
-    end
-  end
-
   describe '#eq? #==' do
     it 'returns true/false when comparing objects' do
       expect(deferred_result_default.eql?(Bandwidth::DeferredResult.new)).to be true
diff --git a/spec/models/message_spec.rb b/spec/models/message_spec.rb
index bb311e5c..c2c745b6 100644
--- a/spec/models/message_spec.rb
+++ b/spec/models/message_spec.rb
@@ -97,12 +97,6 @@
     end
   end
 
-  describe '#list_invalid_properties' do
-    it 'returns list of invalid properties' do
-      expect(message_default.list_invalid_properties).to eq([])
-    end
-  end
-
   describe '#hash' do
     it 'returns a hash code according to attributes' do
       expect(message_default.hash).to be_instance_of(Integer)
@@ -115,13 +109,6 @@
     end
   end
 
-  describe '#valid?' do
-    it 'validates instances with and without attributes set' do
-      expect(message_default).to be_valid
-      expect(message_values).to be_valid
-    end
-  end
-
   describe '#eq? #==' do
     it 'returns true/false when comparing objects' do
       expect(message_default.eql?(Bandwidth::Message.new)).to be true
diff --git a/spec/models/verify_code_request_spec.rb b/spec/models/verify_code_request_spec.rb
index 643a2ed7..48673ff5 100644
--- a/spec/models/verify_code_request_spec.rb
+++ b/spec/models/verify_code_request_spec.rb
@@ -1,6 +1,5 @@
 # Unit tests for Bandwidth::VerifyCodeRequest
 describe Bandwidth::VerifyCodeRequest do
-  let(:verify_code_request_default) { Bandwidth::VerifyCodeRequest.new }
   let(:verify_code_request_values) { Bandwidth::VerifyCodeRequest.new({
     to: '+19195551234',
     scope: '2FA',
@@ -50,12 +49,6 @@
     end
   end
 
-  describe '#list_invalid_properties' do
-    it 'returns list of invalid properties' do
-      expect(verify_code_request_values.list_invalid_properties).to eq([])
-    end
-  end
-
   describe '#hash' do
     it 'returns a hash code according to attributes' do
       expect(verify_code_request_values.hash).to be_instance_of(Integer)
@@ -68,16 +61,15 @@
     end
   end
 
-  describe '#valid?' do
-    it 'validates instances with and without attributes set' do
-      expect(verify_code_request_values).to be_valid
-    end
-  end
-
   describe '#eq? #==' do
     it 'returns true/false when comparing objects' do
-      expect(verify_code_request_default.eql?(Bandwidth::VerifyCodeRequest.new)).to be true
-      expect(verify_code_request_default.eql?(verify_code_request_values)).to be false
+      verify_code_request_equal = Bandwidth::VerifyCodeRequest.new({
+        to: '+19195551234',
+        scope: '2FA',
+        expiration_time_in_minutes: 1.0,
+        code: '123456'
+      })
+      expect(verify_code_request_equal.eql?(verify_code_request_values)).to be true
     end
   end