1 files changed, 69 insertions, 12 deletions
diff --git a/spec/ruby/core/kernel/shared/sprintf.rb b/spec/ruby/core/kernel/shared/sprintf.rb
index 84d472b0d1..2b2c6c9b63 100644
--- a/spec/ruby/core/kernel/shared/sprintf.rb
+++ b/spec/ruby/core/kernel/shared/sprintf.rb
@@ -22,6 +22,7 @@ describe :kernel_sprintf, shared: true do
       @method.call("%d", "112").should == "112"
       @method.call("%d", "0127").should == "87"
       @method.call("%d", "0xc4").should == "196"
+      @method.call("%d", "0").should == "0"
     end
 
     it "raises TypeError exception if cannot convert to Integer" do
@@ -57,6 +58,11 @@ describe :kernel_sprintf, shared: true do
         it "works well with large numbers" do
           @method.call("%#{f}", 1234567890987654321).should == "1234567890987654321"
         end
+
+        it "converts to the empty string if precision is 0 and value is 0" do
+          @method.call("%.#{f}", 0).should == ""
+          @method.call("%.0#{f}", 0).should == ""
+        end
       end
     end
 
@@ -289,21 +295,64 @@ describe :kernel_sprintf, shared: true do
         @method.call("%c", "a").should == "a"
       end
 
-      it "raises ArgumentError if argument is a string of several characters" do
+      it "displays only the first character if argument is a string of several characters" do
+        @method.call("%c", "abc").should == "a"
+      end
+
+      it "displays no characters if argument is an empty string" do
+        @method.call("%c", "").should == ""
+      end
+
+      it "raises TypeError if argument is not String or Integer and cannot be converted to them" do
         -> {
-          @method.call("%c", "abc")
-        }.should raise_error(ArgumentError)
+          @method.call("%c", [])
+        }.should raise_error(TypeError, /no implicit conversion of Array into Integer/)
       end
 
-      it "raises ArgumentError if argument is an empty string" do
+      it "raises TypeError if argument is nil" do
         -> {
-          @method.call("%c", "")
-        }.should raise_error(ArgumentError)
+          @method.call("%c", nil)
+        }.should raise_error(TypeError, /no implicit conversion from nil to integer/)
+      end
+
+      it "tries to convert argument to String with to_str" do
+        obj = BasicObject.new
+        def obj.to_str
+          "a"
+        end
+
+        @method.call("%c", obj).should == "a"
+      end
+
+      it "tries to convert argument to Integer with to_int" do
+        obj = BasicObject.new
+        def obj.to_int
+          90
+        end
+
+        @method.call("%c", obj).should == "Z"
       end
 
-      it "supports Unicode characters" do
-        @method.call("%c", 1286).should == "Ԇ"
-        @method.call("%c", "ش").should == "ش"
+      it "raises TypeError if converting to String with to_str returns non-String" do
+        obj = BasicObject.new
+        def obj.to_str
+          :foo
+        end
+
+        -> {
+          @method.call("%c", obj)
+        }.should raise_error(TypeError, /can't convert BasicObject to String/)
+      end
+
+      it "raises TypeError if converting to Integer with to_int returns non-Integer" do
+        obj = BasicObject.new
+        def obj.to_int
+          :foo
+        end
+
+        -> {
+          @method.call("%c", obj)
+        }.should raise_error(TypeError, /can't convert BasicObject to Integer/)
       end
     end
 
@@ -313,6 +362,10 @@ describe :kernel_sprintf, shared: true do
         obj.should_receive(:inspect).and_return("<inspect-result>")
         @method.call("%p", obj).should == "<inspect-result>"
       end
+
+      it "substitutes 'nil' for nil" do
+        @method.call("%p", nil).should == "nil"
+      end
     end
 
     describe "s" do
@@ -362,11 +415,11 @@ describe :kernel_sprintf, shared: true do
         @method.call("%4.6s", "abcdefg").should == "abcdef"
       end
 
-      it "formats nli with width" do
+      it "formats nil with width" do
         @method.call("%6s", nil).should == "      "
       end
 
-      it "formats nli with precision" do
+      it "formats nil with precision" do
         @method.call("%.6s", nil).should == ""
       end
 
@@ -396,7 +449,7 @@ describe :kernel_sprintf, shared: true do
 
       it "is escaped by %" do
         @method.call("%%").should == "%"
-        @method.call("%%d", 10).should == "%d"
+        @method.call("%%d").should == "%d"
       end
     end
   end
@@ -927,4 +980,8 @@ describe :kernel_sprintf, shared: true do
       }
     end
   end
+
+  it "does not raise error when passed more arguments than needed" do
+    sprintf("%s %d %c", "string", 2, "c", []).should == "string 2 c"
+  end
 end