diff --git a/bindings/ruby/tests/test_whisper.rb b/bindings/ruby/tests/test_whisper.rb
index a496b3ae..0095ea20 100644
--- a/bindings/ruby/tests/test_whisper.rb
+++ b/bindings/ruby/tests/test_whisper.rb
@@ -116,38 +116,38 @@ class TestWhisper < Test::Unit::TestCase
     assert !@params.split_on_word
   end
 
-  def test_whisper
-    @whisper = Whisper::Context.new(File.join(TOPDIR, '..', '..', 'models', 'ggml-base.en.bin'))
-    params  = Whisper::Params.new
-    params.print_timestamps = false
+  sub_test_case "#transcribe" do
+    def setup
+      @whisper = Whisper::Context.new(File.join(TOPDIR, '..', '..', 'models', 'ggml-base.en.bin'))
+      @params  = Whisper::Params.new
+      @params.print_timestamps = false
+      @jfk = File.join(TOPDIR, '..', '..', 'samples', 'jfk.wav')
+    end
 
-    jfk = File.join(TOPDIR, '..', '..', 'samples', 'jfk.wav')
-    @whisper.transcribe(jfk, params) {|text|
-      assert_match /ask not what your country can do for you, ask what you can do for your country/, text
-    }
-  end
+    def test_whisper
+      @whisper.transcribe(@jfk, @params) {|text|
+        assert_match /ask not what your country can do for you, ask what you can do for your country/, text
+      }
+    end
 
-  def test_new_segment_callback_lambda
-    counter = 0
-    @params.new_segment_callback = ->(text, start_time, end_time, index) {
-      assert_kind_of String, text
-      assert_kind_of Integer, start_time
-      assert_kind_of Integer, end_time
-      assert_same index, counter
-      counter += 1
-    }
-    whisper = Whisper::Context.new(File.join(TOPDIR, '..', '..', 'models', 'ggml-base.en.bin'))
-    jfk = File.join(TOPDIR, '..', '..', 'samples', 'jfk.wav')
-    whisper.transcribe(jfk, @params)
-  end
+    def test_new_segment_callback_lambda
+      counter = 0
+      @params.new_segment_callback = ->(text, start_time, end_time, index) {
+        assert_kind_of String, text
+        assert_kind_of Integer, start_time
+        assert_kind_of Integer, end_time
+        assert_same index, counter
+        counter += 1
+      }
+      @whisper.transcribe(@jfk, @params)
+    end
 
-  def test_new_segment_callback_proc
-    @params.new_segment_callback = proc {|text| # proc checks arguments loosly
-      assert_kind_of String, text
-    }
-    whisper = Whisper::Context.new(File.join(TOPDIR, '..', '..', 'models', 'ggml-base.en.bin'))
-    jfk = File.join(TOPDIR, '..', '..', 'samples', 'jfk.wav')
-    whisper.transcribe(jfk, @params)
+    def test_new_segment_callback_proc
+      @params.new_segment_callback = proc {|text| # proc checks arguments loosly
+        assert_kind_of String, text
+      }
+      @whisper.transcribe(@jfk, @params)
+    end
   end
 
   def test_build