1 files changed, 52 insertions, 12 deletions
diff --git a/spec/ruby/core/kernel/sprintf_spec.rb b/spec/ruby/core/kernel/sprintf_spec.rb
index a89b253803..5a4a90ff7a 100644
--- a/spec/ruby/core/kernel/sprintf_spec.rb
+++ b/spec/ruby/core/kernel/sprintf_spec.rb
@@ -1,24 +1,64 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/sprintf', __FILE__)
-require File.expand_path('../shared/sprintf_encoding', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/sprintf'
+require_relative 'shared/sprintf_encoding'
+
+describe :kernel_sprintf_to_str, shared: true do
+  it "calls #to_str to convert the format object to a String" do
+    obj = mock('format string')
+    obj.should_receive(:to_str).and_return("to_str: %i")
+    @method.call(obj, 42).should == "to_str: 42"
+  end
+end
 
 describe "Kernel#sprintf" do
-  it_behaves_like :kernel_sprintf, -> (format, *args) {
-    sprintf(format, *args)
+  it_behaves_like :kernel_sprintf, -> format, *args {
+    r = nil
+    -> {
+      r = sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
+  }
+
+  it_behaves_like :kernel_sprintf_encoding, -> format, *args {
+    r = nil
+    -> {
+      r = sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
   }
 
-  it_behaves_like :kernel_sprintf_encoding, -> (format, *args) {
-    sprintf(format, *args)
+  it_behaves_like :kernel_sprintf_to_str, -> format, *args {
+    r = nil
+    -> {
+      r = sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
   }
 end
 
 describe "Kernel.sprintf" do
-  it_behaves_like :kernel_sprintf, -> (format, *args) {
-    Kernel.sprintf(format, *args)
+  it_behaves_like :kernel_sprintf, -> format, *args {
+    r = nil
+    -> {
+      r = Kernel.sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
+  }
+
+  it_behaves_like :kernel_sprintf_encoding, -> format, *args {
+    r = nil
+    -> {
+      r = Kernel.sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
   }
 
-  it_behaves_like :kernel_sprintf_encoding, -> (format, *args) {
-    Kernel.sprintf(format, *args)
+  it_behaves_like :kernel_sprintf_to_str, -> format, *args {
+    r = nil
+    -> {
+      r = Kernel.sprintf(format, *args)
+    }.should_not complain(verbose: true)
+    r
   }
 end