diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index db716f2..cfd974a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -10,19 +10,13 @@
 
 require_relative "support/read_monitor"
 require_relative "support/managed_tempfile"
-require_relative "support/zip_inspection"
 require_relative "support/chunked_encoding"
 require_relative "support/allocate_under_matcher"
 
 RSpec.configure do |config|
-  config.include ZipInspection
   config.include ChunkedEncoding
 
   config.after :each do
     ManagedTempfile.prune!
   end
-
-  config.after :suite do
-    $stderr << $zip_inspection_buf.string if $zip_inspection_buf
-  end
 end
diff --git a/spec/support/zip_inspection.rb b/spec/support/zip_inspection.rb
deleted file mode 100644
index e3d45ff..0000000
--- a/spec/support/zip_inspection.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-module ZipInspection
-  def inspect_zip_with_external_tool(path_to_zip)
-    return unless ENV["INSPECT_TEST_ZIPS"]
-
-    zipinfo_path = "zipinfo"
-    $zip_inspection_buf ||= StringIO.new
-    $zip_inspection_buf.puts "\n"
-    # The only way to get at the RSpec example without using the block argument
-    $zip_inspection_buf.puts "Inspecting ZIP output of #{inspect}."
-    $zip_inspection_buf.puts 'Be aware that the zipinfo version on OSX is too \
-                              old to deal with Zip64.'
-    escaped_cmd = Shellwords.join([zipinfo_path, "-tlhvz", path_to_zip])
-    $zip_inspection_buf.puts `#{escaped_cmd}`
-  end
-end
diff --git a/spec/zip_kit/output_enumerator_spec.rb b/spec/zip_kit/output_enumerator_spec.rb
index de4edbc..1bbc141 100644
--- a/spec/zip_kit/output_enumerator_spec.rb
+++ b/spec/zip_kit/output_enumerator_spec.rb
@@ -2,7 +2,7 @@
 
 describe ZipKit::OutputEnumerator do
   it "returns parts of the ZIP file when called via #each with immediate yield" do
-    output_buf = Tempfile.new("output")
+    output_buf = ManagedTempfile.new("output")
 
     file_body = Random.new.bytes(1024 * 1024 + 8981)
 
@@ -34,7 +34,7 @@
   end
 
   it "returns parts of the ZIP file when called using an Enumerator" do
-    output_buf = Tempfile.new("output")
+    output_buf = ManagedTempfile.new("output")
 
     file_body = Random.new.bytes(1024 * 1024 + 8981)
 
diff --git a/spec/zip_kit/rack_body_spec.rb b/spec/zip_kit/rack_body_spec.rb
index 4de6909..b7caeac 100644
--- a/spec/zip_kit/rack_body_spec.rb
+++ b/spec/zip_kit/rack_body_spec.rb
@@ -2,7 +2,7 @@
 
 describe ZipKit::RackBody do
   it "is usable as a Rack response body, supports each()" do
-    output_buf = Tempfile.new("output")
+    output_buf = ManagedTempfile.new("output")
 
     file_body = Random.new.bytes(1024 * 1024 + 8981)
 
diff --git a/spec/zip_kit/remote_io_spec.rb b/spec/zip_kit/remote_io_spec.rb
index d919d48..fa54a8a 100644
--- a/spec/zip_kit/remote_io_spec.rb
+++ b/spec/zip_kit/remote_io_spec.rb
@@ -42,7 +42,7 @@
 
   describe "#read" do
     before :each do
-      @buf = Tempfile.new("simulated-http")
+      @buf = ManagedTempfile.new("simulated-http")
       @buf.binmode
       5.times { @buf << Random.new.bytes(1024 * 1024 * 3) }
       @buf.rewind
diff --git a/spec/zip_kit/remote_uncap_spec.rb b/spec/zip_kit/remote_uncap_spec.rb
index c53af6f..1a04282 100644
--- a/spec/zip_kit/remote_uncap_spec.rb
+++ b/spec/zip_kit/remote_uncap_spec.rb
@@ -38,12 +38,12 @@
 
   it 'returns an array of remote entries that can be used to fetch the segments \
       from within the ZIP' do
-    payload1 = Tempfile.new "payload1"
+    payload1 = ManagedTempfile.new "payload1"
     payload1 << Random.new.bytes((1024 * 1024 * 5) + 10)
     payload1.flush
     payload1.rewind
 
-    payload2 = Tempfile.new "payload2"
+    payload2 = ManagedTempfile.new "payload2"
     payload2 << Random.new.bytes(1024 * 1024 * 3)
     payload2.flush
     payload2.rewind
@@ -79,11 +79,11 @@
   end
 
   it "can cope with an empty file within the zip" do
-    payload1 = Tempfile.new "payload1"
+    payload1 = ManagedTempfile.new "payload1"
     payload1.flush
     payload1.rewind
 
-    payload2 = Tempfile.new "payload2"
+    payload2 = ManagedTempfile.new "payload2"
     payload2 << Random.new.bytes(1024)
     payload2.flush
     payload2.rewind
diff --git a/spec/zip_kit/streamer_spec.rb b/spec/zip_kit/streamer_spec.rb
index 1236cee..5dc9747 100644
--- a/spec/zip_kit/streamer_spec.rb
+++ b/spec/zip_kit/streamer_spec.rb
@@ -104,7 +104,7 @@ def stream_with_just_write.write(bytes)
   end
 
   it "can write and then read the block-deflated files" do
-    f = Tempfile.new("raw")
+    f = ManagedTempfile.new("raw")
     f.binmode
 
     rewind_after(f) do
@@ -123,7 +123,7 @@ def stream_with_just_write.write(bytes)
     end
 
     # Perform the zipping
-    zip_file = Tempfile.new("z")
+    zip_file = ManagedTempfile.new("z")
     zip_file.binmode
 
     described_class.open(zip_file) do |zip|
@@ -147,13 +147,11 @@ def stream_with_just_write.write(bytes)
     expect(per_filename["compressed-file.bin"].bytesize).to eq(f.size)
     expect(Digest::SHA1.hexdigest(per_filename["compressed-file.bin"])).to \
       eq(Digest::SHA1.hexdigest(f.read))
-
-    inspect_zip_with_external_tool(zip_file.path)
   end
 
   it "can write and then read an empty directory" do
     # Perform the zipping
-    zip_file = Tempfile.new("z")
+    zip_file = ManagedTempfile.new("z")
     zip_file.binmode
 
     described_class.open(zip_file) do |zip|
@@ -172,8 +170,6 @@ def stream_with_just_write.write(bytes)
     end
 
     expect(per_filename["Tunes/"].bytesize).to eq(154)
-
-    inspect_zip_with_external_tool(zip_file.path)
   end
 
   it "can write the data descriptor and updates the last entry as well" do
@@ -197,7 +193,7 @@ def stream_with_just_write.write(bytes)
   end
 
   it "archives files which can then be read using the usual means with Rubyzip" do
-    zip_buf = Tempfile.new("zipp")
+    zip_buf = ManagedTempfile.new("zipp")
     zip_buf.binmode
     output_io = double("IO")
 
@@ -242,17 +238,10 @@ def stream_with_just_write.write(bytes)
 
     expect(per_filename["first-file.bin"].unpack("C*")).to eq(raw_file1.unpack("C*"))
     expect(per_filename["second-file.bin"].unpack("C*")).to eq(raw_file2.unpack("C*"))
-
-    wd = Dir.pwd
-    Dir.mktmpdir do |td|
-      Dir.chdir(td)
-      inspect_zip_with_external_tool(zip_buf.path)
-    end
-    Dir.chdir(wd)
   end
 
   it "sets the general-purpose flag for entries with UTF8 names" do
-    zip_buf = Tempfile.new("zipp")
+    zip_buf = ManagedTempfile.new("zipp")
     zip_buf.binmode
 
     # Generate a couple of random files
@@ -416,8 +405,6 @@ def stream_with_just_write.write(bytes)
       readback.force_encoding(Encoding::BINARY)
       expect(readback[0..10]).to eq(File.binread(__dir__ + "/war-and-peace.txt")[0..10])
     end
-
-    inspect_zip_with_external_tool(tf.path)
   end
 
   it "can create a valid ZIP archive without any files" do
@@ -556,7 +543,7 @@ def stream_with_just_write.write(bytes)
   end
 
   it "supports automatic mode selection using a heuristic" do
-    zip_file = Tempfile.new
+    zip_file = ManagedTempfile.new
     rng = Random.new(42)
     repeating_string = "many many delicious, compressible words"
     n_writes = 24000
@@ -609,7 +596,7 @@ def stream_with_just_write.write(bytes)
   end
 
   it "rolls back entries where writes have failed" do
-    zip_file = Tempfile.new("zipp")
+    zip_file = ManagedTempfile.new("zipp")
     described_class.open(zip_file) do |zip|
       begin
         zip.write_deflated_file("deflated.txt", modification_time: Time.new(2018, 1, 1)) do |sink|