diff --git a/lib/compliance_engine/data_loader/file.rb b/lib/compliance_engine/data_loader/file.rb
index 06b98af..07a662e 100644
--- a/lib/compliance_engine/data_loader/file.rb
+++ b/lib/compliance_engine/data_loader/file.rb
@@ -14,12 +14,12 @@ def initialize(file, fileclass: ::File, key: file)
   end
 
   def refresh
-    size = @fileclass.size(@filename)
-    mtime = @fileclass.mtime(@filename)
-    return if size == @size && mtime == @mtime
+    newsize = @fileclass.size(@filename)
+    newmtime = @fileclass.mtime(@filename)
+    return if newsize == @size && newmtime == @mtime
 
-    @size = size
-    @mtime = mtime
+    @size = newsize
+    @mtime = newmtime
     self.data = parse(@fileclass.read(@filename))
   end
 
diff --git a/spec/classes/compliance_engine/data_loader/file_spec.rb b/spec/classes/compliance_engine/data_loader/file_spec.rb
new file mode 100644
index 0000000..ff63665
--- /dev/null
+++ b/spec/classes/compliance_engine/data_loader/file_spec.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'compliance_engine/data_loader/file'
+
+RSpec.describe ComplianceEngine::DataLoader::File do
+  let(:filename) { '/path/to/file' }
+
+  before(:each) do
+    allow(File).to receive(:size).and_call_original
+    allow(File).to receive(:size).with(filename).and_return(0)
+
+    allow(File).to receive(:mtime).and_call_original
+    allow(File).to receive(:mtime).with(filename).and_return(Time.now)
+
+    allow(File).to receive(:read).and_call_original
+    allow(File).to receive(:read).with(filename).and_return("\n")
+  end
+
+  it 'fails to initialize' do
+    expect { described_class.new(filename) }.to raise_error(NoMethodError)
+  end
+end
diff --git a/spec/classes/compliance_engine/data_loader/json_spec.rb b/spec/classes/compliance_engine/data_loader/json_spec.rb
index 14798f7..c21e98c 100644
--- a/spec/classes/compliance_engine/data_loader/json_spec.rb
+++ b/spec/classes/compliance_engine/data_loader/json_spec.rb
@@ -5,6 +5,8 @@
 
 RSpec.describe ComplianceEngine::DataLoader::Json do
   before(:each) do
+    allow(File).to receive(:size).and_call_original
+    allow(File).to receive(:mtime).and_call_original
     allow(File).to receive(:read).and_call_original
   end
 
@@ -23,6 +25,9 @@
 
   shared_examples 'an observable' do
     it 'updates the data' do
+      data_loader.instance_variable_set(:@size, 0)
+      data_loader.instance_variable_set(:@mtime, Time.now)
+      data_loader.data = initial_data
       data_loader.refresh
       expect(data_loader.data).to eq(updated_data)
     end
@@ -40,6 +45,10 @@ def update(data)
         attr_accessor :data
       end
 
+      data_loader.instance_variable_set(:@size, 0)
+      data_loader.instance_variable_set(:@mtime, Time.now)
+      data_loader.data = initial_data
+
       observer = ExampleObserver.new(data_loader)
       data_loader.refresh
       expect(observer.data).to be_instance_of(described_class)
@@ -60,6 +69,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_json)
     end
 
@@ -67,6 +78,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_json)
       end
 
@@ -87,6 +100,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_json)
     end
 
@@ -94,6 +109,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_json)
       end
 
@@ -114,6 +131,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_json)
     end
 
@@ -121,6 +140,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_json)
       end
 
@@ -133,6 +154,8 @@ def update(data)
     let(:data) { 'invalid data' }
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(data.to_json)
     end
 
@@ -147,12 +170,16 @@ def update(data)
     let(:updated_data) { 'invalid data' }
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_json)
     end
 
     it 'does not update the data' do
       loader = described_class.new(filename)
 
+      allow(File).to receive(:size).with(filename).and_return(1)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
       allow(File).to receive(:read).with(filename).and_return(updated_data.to_json)
 
       expect { loader.refresh }.to raise_error(ComplianceEngine::Error, 'Data must be a hash')
diff --git a/spec/classes/compliance_engine/data_loader/yaml_spec.rb b/spec/classes/compliance_engine/data_loader/yaml_spec.rb
index e20e207..3e3f6d9 100644
--- a/spec/classes/compliance_engine/data_loader/yaml_spec.rb
+++ b/spec/classes/compliance_engine/data_loader/yaml_spec.rb
@@ -5,6 +5,8 @@
 
 RSpec.describe ComplianceEngine::DataLoader::Yaml do
   before(:each) do
+    allow(File).to receive(:size).and_call_original
+    allow(File).to receive(:mtime).and_call_original
     allow(File).to receive(:read).and_call_original
   end
 
@@ -23,6 +25,9 @@
 
   shared_examples 'an observable' do
     it 'updates the data' do
+      data_loader.instance_variable_set(:@size, 0)
+      data_loader.instance_variable_set(:@mtime, Time.now)
+      data_loader.data = initial_data
       data_loader.refresh
       expect(data_loader.data).to eq(updated_data)
     end
@@ -40,6 +45,10 @@ def update(data)
         attr_accessor :data
       end
 
+      data_loader.instance_variable_set(:@size, 0)
+      data_loader.instance_variable_set(:@mtime, Time.now)
+      data_loader.data = initial_data
+
       observer = ExampleObserver.new(data_loader)
       data_loader.refresh
       expect(observer.data).to be_instance_of(described_class)
@@ -60,6 +69,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_yaml)
     end
 
@@ -67,6 +78,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_yaml)
       end
 
@@ -87,6 +100,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_yaml)
     end
 
@@ -94,6 +109,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_yaml)
       end
 
@@ -114,6 +131,8 @@ def update(data)
     end
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_yaml)
     end
 
@@ -121,6 +140,8 @@ def update(data)
 
     context 'with updated data' do
       before(:each) do
+        allow(File).to receive(:size).with(filename).and_return(1)
+        allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
         allow(File).to receive(:read).with(filename).and_return(updated_data.to_yaml)
       end
 
@@ -133,6 +154,8 @@ def update(data)
     let(:data) { 'invalid data' }
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(data.to_yaml)
     end
 
@@ -147,12 +170,16 @@ def update(data)
     let(:updated_data) { 'invalid data' }
 
     before(:each) do
+      allow(File).to receive(:size).with(filename).and_return(0)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now)
       allow(File).to receive(:read).with(filename).and_return(initial_data.to_yaml)
     end
 
     it 'does not update the data' do
       loader = described_class.new(filename)
 
+      allow(File).to receive(:size).with(filename).and_return(1)
+      allow(File).to receive(:mtime).with(filename).and_return(Time.now + 1)
       allow(File).to receive(:read).with(filename).and_return(updated_data.to_yaml)
 
       expect { loader.refresh }.to raise_error(ComplianceEngine::Error, 'Data must be a hash')