diff --git a/spec/unit/puppet/provider/psmodule_spec.rb b/spec/unit/puppet/provider/psmodule_spec.rb
index ad734a5..35bcec8 100644
--- a/spec/unit/puppet/provider/psmodule_spec.rb
+++ b/spec/unit/puppet/provider/psmodule_spec.rb
@@ -5,17 +5,18 @@
 describe provider_class do
   before(:each) do
     type = Puppet::Type.type(:package).new(
-      name: 'module', source: 'http://source.com'
+      name: 'module', source: 'http://source.com', ensure: :present
     )
     @provider_instance = provider_class.new(type)
     allow(provider_class).to receive(:invoke_ps_command).with(
-      provider_class.instances_command).and_return(
-        [
-          '{"name":"PackageManagement","ensure":["1.1.6.0","1.1.7.0"],"provider":"windowspowershell"}',
-          '{"name":"Pester","ensure":["4.0.8"],"provider":"windowspowershell"}',
-          '{"name":"PowerShellGet","ensure":["1.5.0.0"],"provider":"windowspowershell"}'
-        ]
-      )
+      provider_class.instances_command
+    ).and_return(
+      [
+        '{"name":"PackageManagement","ensure":["1.1.6.0","1.1.7.0"],"provider":"windowspowershell"}',
+        '{"name":"Pester","ensure":["4.0.8"],"provider":"windowspowershell"}',
+        '{"name":"PowerShellGet","ensure":["1.5.0.0"],"provider":"windowspowershell"}'
+      ]
+    )
   end
   describe :instances do
     specify 'returns an array of :windowspowershell providers' do
@@ -24,4 +25,45 @@
       expect(instances).to all(be_instance_of(provider_class))
     end
   end
+  describe :install_options do
+    specify 'flattens an array of options to a command string' do
+      input = ['-foo', '-bar']
+      output = @provider_instance.install_options input
+      expect(output).to eq('-foo -bar')
+    end
+    specify 'flattens a mixed array of options to a command string' do
+      input = ['-foobar', { '-foo' => 'bar' }]
+      output = @provider_instance.install_options input
+      expect(output).to eq('-foobar -foo bar')
+    end
+  end
+  describe :install_command do
+    specify 'with name and source' do
+      output = @provider_instance.install_command
+      expect(output).to eq(
+        'Install-Module module -Scope AllUsers -Force -Repository http://source.com'
+      )
+    end
+    specify 'with name, version and source' do
+      type = Puppet::Type.type(:package).new(
+        name: 'module', ensure: '1.0.0', source: 'http://source.com'
+      )
+      provider_instance = provider_class.new(type)
+      output = provider_instance.install_command
+      expect(output).to eq(
+        'Install-Module module -Scope AllUsers -Force -RequiredVersion 1.0.0 -Repository http://source.com'
+      )
+    end
+    specify 'with name, version, source and install_options' do
+      type = Puppet::Type.type(:package).new(
+        name: 'module', ensure: '1.0.0', source: 'http://source.com',
+        install_options: ['-foobar', { '-foo' => 'bar' }]
+      )
+      provider_instance = provider_class.new(type)
+      output = provider_instance.install_command
+      expect(output).to eq(
+        'Install-Module module -Scope AllUsers -Force -RequiredVersion 1.0.0 -Repository http://source.com -foobar -foo bar'
+      )
+    end
+  end
 end