Correct file mocks in tests

In 7285844 the method was changed from
File.open to File.write, but the mocks weren't modified. This changes
from allow to expect so that if it's refactored, it will fail the tests.

Fixes: 7285844 ("Auto-correct rubocop offenses")

spec/unit/puppet/provider/ssl_pkey/openssl_spec.rb

@@ -25,15 +25,15 @@
   context 'when creating a key with defaults' do
     it 'creates an rsa key' do
       allow(OpenSSL::PKey::RSA).to receive(:new).with(2048).and_return(key)
-      allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+      expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
       resource.provider.create
     end
 
     context 'when setting size' do
       it 'creates with given size' do
         resource[:size] = 1024
         allow(OpenSSL::PKey::RSA).to receive(:new).with(1024).and_return(key)
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -43,7 +43,7 @@
         resource[:password] = '2x$5{'
         allow(OpenSSL::PKey::RSA).to receive(:new).with(2048).and_return(key)
         allow(OpenSSL::Cipher).to receive(:new).with('des3')
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -53,7 +53,7 @@
     it 'creates a dsa key' do
       resource[:authentication] = :rsa
       allow(OpenSSL::PKey::RSA).to receive(:new).with(2048).and_return(key)
-      allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+      expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
       resource.provider.create
     end
 
@@ -62,7 +62,7 @@
         resource[:authentication] = :rsa
         resource[:size] = 1024
         allow(OpenSSL::PKey::RSA).to receive(:new).with(1024).and_return(key)
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -73,7 +73,7 @@
         resource[:password] = '2x$5{'
         allow(OpenSSL::PKey::RSA).to receive(:new).with(2048).and_return(key)
         allow(OpenSSL::Cipher).to receive(:new).with('des3')
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -83,7 +83,7 @@
     it 'creates a dsa key' do
       resource[:authentication] = :dsa
       allow(OpenSSL::PKey::DSA).to receive(:new).with(2048).and_return(key)
-      allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+      expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
       resource.provider.create
     end
 
@@ -92,7 +92,7 @@
         resource[:authentication] = :dsa
         resource[:size] = 1024
         allow(OpenSSL::PKey::DSA).to receive(:new).with(1024).and_return(key)
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -103,7 +103,7 @@
         resource[:password] = '2x$5{'
         allow(OpenSSL::PKey::DSA).to receive(:new).with(2048).and_return(key)
         allow(OpenSSL::Cipher).to receive(:new).with('des3')
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -115,7 +115,7 @@
     it 'creates an ec key' do
       resource[:authentication] = :ec
       allow(OpenSSL::PKey::EC).to receive(:new).with('secp384r1').and_return(key)
-      allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+      expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
       resource.provider.create
     end
 
@@ -124,7 +124,7 @@
         resource[:authentication] = :ec
         resource[:curve] = 'prime239v1'
         allow(OpenSSL::PKey::EC).to receive(:new).with('prime239v1').and_return(key)
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end
@@ -135,7 +135,7 @@
         resource[:password] = '2x$5{'
         allow(OpenSSL::PKey::EC).to receive(:new).with('secp384r1').and_return(key)
         allow(OpenSSL::Cipher).to receive(:new).with('des3')
-        allow(File).to receive(:open).with('/tmp/foo.key', 'w')
+        expect(File).to receive(:write).with('/tmp/foo.key', kind_of(String))
         resource.provider.create
       end
     end