diff --git a/spec/lib/msf/core/exploit/remote/java/rmi/client/jmx/connection_spec.rb b/spec/lib/msf/core/exploit/remote/java/rmi/client/jmx/connection_spec.rb
index 4072a8dfc2..203ef93d90 100644
--- a/spec/lib/msf/core/exploit/remote/java/rmi/client/jmx/connection_spec.rb
+++ b/spec/lib/msf/core/exploit/remote/java/rmi/client/jmx/connection_spec.rb
@@ -30,36 +30,25 @@ RSpec.describe Msf::Exploit::Remote::Java::Rmi::Client::Jmx::Connection do
 
       let(:name_get) { 'DefaultDomain:type=MLet' }
 
-      #
-      # Callbacks
-      #
-
-      before(:each) do
-        def msf_io.put(_data)
-          seek(0)
-          write(
-            "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
-              "\x4e\x3d\x1c\x2f\x80\x08\x73\x72\x00\x1f\x6a\x61\x76\x61\x78\x2e" +
-              "\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63" +
-              "\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28\x7b" +
-              "\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d\x65" +
-              "\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53\x74" +
-              "\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d\x4c" +
-              "\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74" +
-              "\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70\x74" +
-              "\x00\x1d\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65" +
-              "\x6e\x74\x2e\x6c\x6f\x61\x64\x69\x6e\x67\x2e\x4d\x4c\x65\x74\x73" +
-              "\x72\x00\x1b\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d" +
-              "\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03" +
-              "\xa7\x1b\xeb\x6d\x15\xcf\x03\x00\x00\x70\x78\x70\x74\x00\x17\x44" +
-              "\x65\x66\x61\x75\x6c\x74\x44\x6f\x6d\x61\x69\x6e\x3a\x74\x79\x70" +
-              "\x65\x3d\x4d\x4c\x65\x74\x78"
-          )
-          seek(0)
-        end
-      end
-
       it "returns true" do
+        msf_io.set_msf_data(
+          "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
+            "\x4e\x3d\x1c\x2f\x80\x08\x73\x72\x00\x1f\x6a\x61\x76\x61\x78\x2e" +
+            "\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63" +
+            "\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28\x7b" +
+            "\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d\x65" +
+            "\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53\x74" +
+            "\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d\x4c" +
+            "\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74" +
+            "\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70\x74" +
+            "\x00\x1d\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65" +
+            "\x6e\x74\x2e\x6c\x6f\x61\x64\x69\x6e\x67\x2e\x4d\x4c\x65\x74\x73" +
+            "\x72\x00\x1b\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d" +
+            "\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03" +
+            "\xa7\x1b\xeb\x6d\x15\xcf\x03\x00\x00\x70\x78\x70\x74\x00\x17\x44" +
+            "\x65\x66\x61\x75\x6c\x74\x44\x6f\x6d\x61\x69\x6e\x3a\x74\x79\x70" +
+            "\x65\x3d\x4d\x4c\x65\x74\x78"
+        )
         expect(mod.send_jmx_get_object_instance(sock: msf_io, name: name_get)).to be_truthy
       end
     end
@@ -69,32 +58,25 @@ RSpec.describe Msf::Exploit::Remote::Java::Rmi::Client::Jmx::Connection do
     context "when the object is created successfully" do
       include_context "Msf::StringIO"
 
-      before(:each) do
-        def msf_io.put(_data)
-          seek(0)
-          write(
-            "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
-              "\x4e\x3d\x1c\x2f\x80\x07\x73\x72\x00\x1f\x6a\x61\x76\x61\x78\x2e" +
-              "\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63" +
-              "\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28\x7b" +
-              "\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d\x65" +
-              "\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53\x74" +
-              "\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d\x4c" +
-              "\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74" +
-              "\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70\x74" +
-              "\x00\x1d\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65" +
-              "\x6e\x74\x2e\x6c\x6f\x61\x64\x69\x6e\x67\x2e\x4d\x4c\x65\x74\x73" +
-              "\x72\x00\x1b\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d" +
-              "\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03" +
-              "\xa7\x1b\xeb\x6d\x15\xcf\x03\x00\x00\x70\x78\x70\x74\x00\x17\x44" +
-              "\x65\x66\x61\x75\x6c\x74\x44\x6f\x6d\x61\x69\x6e\x3a\x74\x79\x70" +
-              "\x65\x3d\x4d\x4c\x65\x74\x78"
-          )
-          seek(0)
-        end
-      end
-
       it "returns true" do
+        msf_io.set_msf_data(
+          "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
+            "\x4e\x3d\x1c\x2f\x80\x07\x73\x72\x00\x1f\x6a\x61\x76\x61\x78\x2e" +
+            "\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63" +
+            "\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28\x7b" +
+            "\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d\x65" +
+            "\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53\x74" +
+            "\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d\x4c" +
+            "\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74" +
+            "\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70\x74" +
+            "\x00\x1d\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65" +
+            "\x6e\x74\x2e\x6c\x6f\x61\x64\x69\x6e\x67\x2e\x4d\x4c\x65\x74\x73" +
+            "\x72\x00\x1b\x6a\x61\x76\x61\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d" +
+            "\x65\x6e\x74\x2e\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03" +
+            "\xa7\x1b\xeb\x6d\x15\xcf\x03\x00\x00\x70\x78\x70\x74\x00\x17\x44" +
+            "\x65\x66\x61\x75\x6c\x74\x44\x6f\x6d\x61\x69\x6e\x3a\x74\x79\x70" +
+            "\x65\x3d\x4d\x4c\x65\x74\x78"
+        )
         expect(mod.send_jmx_create_mbean(sock: msf_io, name: name_create)).to be_truthy
       end
     end
@@ -116,39 +98,28 @@ RSpec.describe Msf::Exploit::Remote::Java::Rmi::Client::Jmx::Connection do
         }
       end
 
-      #
-      # Callbacks
-      #
-
-      before(:each) do
-        def msf_io.put(_data)
-          seek(0)
-          write(
-            "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
-              "\x4e\x3d\x1c\x2f\x80\x09\x73\x72\x00\x11\x6a\x61\x76\x61\x2e\x75" +
-              "\x74\x69\x6c\x2e\x48\x61\x73\x68\x53\x65\x74\xba\x44\x85\x95\x96" +
-              "\xb8\xb7\x34\x03\x00\x00\x70\x78\x70\x77\x0c\x00\x00\x00\x10\x3f" +
-              "\x40\x00\x00\x00\x00\x00\x01\x73\x72\x00\x1f\x6a\x61\x76\x61\x78" +
-              "\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65" +
-              "\x63\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28" +
-              "\x7b\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d" +
-              "\x65\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53" +
-              "\x74\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d" +
-              "\x4c\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e" +
-              "\x74\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70" +
-              "\x74\x00\x15\x6d\x65\x74\x61\x73\x70\x6c\x6f\x69\x74\x2e\x4a\x4d" +
-              "\x58\x50\x61\x79\x6c\x6f\x61\x64\x73\x72\x00\x1b\x6a\x61\x76\x61" +
-              "\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a" +
-              "\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03\xa7\x1b\xeb\x6d\x15\xcf\x03" +
-              "\x00\x00\x70\x78\x70\x74\x00\x21\x4d\x4c\x65\x74\x47\x78\x61\x7a" +
-              "\x6f\x6f\x6d\x79\x3a\x6e\x61\x6d\x65\x3d\x6a\x6d\x78\x70\x61\x79" +
-              "\x6c\x6f\x61\x64\x2c\x69\x64\x3d\x31\x78\x78"
-          )
-          seek(0)
-        end
-      end
-
       it "returns true" do
+        msf_io.set_msf_data(
+          "\x51\xac\xed\x00\x05\x77\x0f\x01\x1e\xc8\x7c\x01\x00\x00\x01\x4c" +
+            "\x4e\x3d\x1c\x2f\x80\x09\x73\x72\x00\x11\x6a\x61\x76\x61\x2e\x75" +
+            "\x74\x69\x6c\x2e\x48\x61\x73\x68\x53\x65\x74\xba\x44\x85\x95\x96" +
+            "\xb8\xb7\x34\x03\x00\x00\x70\x78\x70\x77\x0c\x00\x00\x00\x10\x3f" +
+            "\x40\x00\x00\x00\x00\x00\x01\x73\x72\x00\x1f\x6a\x61\x76\x61\x78" +
+            "\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a\x65" +
+            "\x63\x74\x49\x6e\x73\x74\x61\x6e\x63\x65\xc7\x1a\x0a\xcf\xad\x28" +
+            "\x7b\x76\x02\x00\x02\x4c\x00\x09\x63\x6c\x61\x73\x73\x4e\x61\x6d" +
+            "\x65\x74\x00\x12\x4c\x6a\x61\x76\x61\x2f\x6c\x61\x6e\x67\x2f\x53" +
+            "\x74\x72\x69\x6e\x67\x3b\x4c\x00\x04\x6e\x61\x6d\x65\x74\x00\x1d" +
+            "\x4c\x6a\x61\x76\x61\x78\x2f\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e" +
+            "\x74\x2f\x4f\x62\x6a\x65\x63\x74\x4e\x61\x6d\x65\x3b\x70\x78\x70" +
+            "\x74\x00\x15\x6d\x65\x74\x61\x73\x70\x6c\x6f\x69\x74\x2e\x4a\x4d" +
+            "\x58\x50\x61\x79\x6c\x6f\x61\x64\x73\x72\x00\x1b\x6a\x61\x76\x61" +
+            "\x78\x2e\x6d\x61\x6e\x61\x67\x65\x6d\x65\x6e\x74\x2e\x4f\x62\x6a" +
+            "\x65\x63\x74\x4e\x61\x6d\x65\x0f\x03\xa7\x1b\xeb\x6d\x15\xcf\x03" +
+            "\x00\x00\x70\x78\x70\x74\x00\x21\x4d\x4c\x65\x74\x47\x78\x61\x7a" +
+            "\x6f\x6f\x6d\x79\x3a\x6e\x61\x6d\x65\x3d\x6a\x6d\x78\x70\x61\x79" +
+            "\x6c\x6f\x61\x64\x2c\x69\x64\x3d\x31\x78\x78"
+        )
         expect(mod.send_jmx_invoke(invoke_args.merge(sock: msf_io))).to be_truthy
       end
     end