# \[Bug #891\] MiniTest::Assertions#assert\_instance\_of should use Object#instance\_of?

**URL:** <https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740>\
**Category:** Development\
**Created:** [December 16, 2008, 8:34am UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740 "2008-12-16T08:34:59Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 8:34am UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/1 "2008-12-16T08:34:59Z")

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Bug #891: MiniTest::Assertions#assert\_instance\_of should use  
Object#instance\_of?  
[http://redmine.ruby-lang.org/issues/show/891](http://redmine.ruby-lang.org/issues/show/891)

e$B5/I\<\<Te(B: okkez \_  
e$B%9%F!\<%?%9e(B: Open, e$BM%@hEYe(B: Normal  
e$B%+%F%4%je(B: lib

e$B%?%$%H%k$NDL$j$J$N$G$9$,!"e(BMiniTest::Assertions#assert\_instance\_of  
e$B$N\<BAu$,$\*$+$7$$$H;W$$$^$9!#e(B  
Module#=== e$B$G$O$J$/$Fe(B Object#instance\_of?  
e$B$r;HMQ$9$k$Y$-$G$O$J$$$G$7$g$&$+!)e(B  
test/unit e$B$G$Oe(B Object#instance\_of? e$B$r;HMQ$7$F$$$^$7$?!#e(B

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<div class="post-metadata">

**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 9:41am UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/2 "2008-12-16T09:41:46Z")

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e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37458] [Bug #891]  
MiniTest::Assertions#assert\_instance\_of should use Object#instance\_of?”  
on Tue, 16 Dec 2008 16:26:38 +0900, okkez \_ [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|e$B%?%$%H%k$NDL$j$J$N$G$9$,!"e(BMiniTest::Assertions#assert\_instance\_of e$B$N\<BAu$,$\*$+$7$$$H;W$$$^$9!#e(B  
|Module#=== e$B$G$O$J$/$Fe(B Object#instance\_of? e$B$r;HMQ$9$k$Y$-$G$O$J$$$G$7$g$&$+!)e(B

e$B$3$N$U$?$D$OF1$8F/$-$G$9$,!“!V$\*$+$7$$!W$H$$$&$N$O$I$&$$$&0Ue(B  
e$BL#$G$7$g$&$+!#!V$h$jNI$/0U?^$rI=8=$9$k!W$H$+$$$&$h$&$J0UL#$Ge(B  
e$B$”$l$P!"%P%0$H$O8@$($J$$$h$&$J!#e(B

---

<div class="post-metadata">

**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 10:18am UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/3 "2008-12-16T10:18:47Z")

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From: Yukihiro M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
Subject: [ruby-dev:37459] Re: [Bug #891]  
MiniTest::Assertions#assert\_instance\_of should use Object#instance\_of?  
Date: Tue, 16 Dec 2008 17:33:46 +0900

> |Module#=== e$B$G$O$J$/$Fe(B Object#instance\_of? e$B$r;HMQ$9$k$Y$-$G$O$J$$$G$7$g$&$+!)e(B
> 
> e$B$3$N$U$?$D$OF1$8F/$-$G$9$,!"!V$\*$+$7$$!W$H$$$&$N$O$I$&$$$&0Ue(B

Object#instance\_of?e$B$O%5%V%/%i%9$@$H$@$a$G$9$h$M!#e(B

Numeric === 1 # =\> true  
Fixnum === 1 # =\> true  
1.instance\_of? Fixnum # =\> true  
1.instance\_of? Numeric # =\> false

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**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 12:31pm UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/4 "2008-12-16T12:31:22Z")

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okkez e$B$G$9!#e(B

# Ruby

e$B$N%j%S%k%I$r$7$F$k4V$K$k$S$-$A$5$s$,%U%)%m!\<$7$F$/$@$5$C$F$^$9$,e(B

# e$B$5$C$-%S%k%I$7$?e(B Ruby e$B$G3NG’$7$F$\_$^$7$?!#e(B

2008/12/16 17:33 Yukihiro M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B$“$l$P!”%P%0$H$O8@$($J$$$h$&$J!#e(B

e$B0J2\<$N$h$&$J\<B9T7k2L$K$J$k$+$i$G$9!#e(B  
Object#instance\_of?(klass) e$B$O%l%7!\<%P$,e(B klass  
e$B$ND\>@$N%$%s%9%?%s%9$K$J$C$F$$$ke(B  
e$B\>l9g$@$1e(B true e$B$rJV$7$^$9!#e(B

> > RUBY\_DESCRIPTION  
> > =\> “ruby 1.9.1 (2008-12-16 revision 20782) [i686-linux]”  
> > String === ‘a’  
> > =\> true  
> > Object === ‘a’  
> > =\> true  
> > ‘a’.kind\_of?(String)  
> > =\> true  
> > ‘a’.kind\_of?(Object)  
> > =\> true  
> > ‘a’.instance\_of?(String)  
> > =\> true  
> > ‘a’.instance\_of?(Object)  
> > =\> false

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<div class="post-metadata">

**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 2:18pm UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/5 "2008-12-16T14:18:14Z")

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e$B%A%1%C%He(B #891 e$B$,99?7$5$l$^$7$?!#e(B (by Yukihiro M.)

e$B%9%F!\<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B  
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

## Applied in changeset r20798.

[http://redmine.ruby-lang.org/issues/show/891](http://redmine.ruby-lang.org/issues/show/891)

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<div class="post-metadata">

**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 2:17pm UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/6 "2008-12-16T14:17:03Z")

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e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:37464] Re: [Bug #891]  
MiniTest::Assertions#assert\_instance\_of should use Object#instance\_of?”  
on Tue, 16 Dec 2008 20:22:23 +0900, okkez [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
writes:

|e$B0J2\<$N$h$&$J\<B9T7k2L$K$J$k$+$i$G$9!#e(B  
|Object#instance\_of?(klass) e$B$O%l%7!\<%P$,e(B klass e$B$ND\>@$N%$%s%9%?%s%9$K$J$C$F$$$ke(B  
|e$B\>l9g$@$1e(B true e$B$rJV$7$^$9!#e(B

e$B$J$k$[$I!#%3%\_%C%H$7$^$9!#e(B

e$B$?$@!“e(Bminiteste$B$Oe(BRyan D.e$B$,%a%s%F%J$G$9$+$i!”:#8e$Oe(B  
ruby-coree$B$K%l%]!\<%H$7$F$$$?$@$/$N$,3N\<B$@$H;W$$$^$9!#:#2s$Ne(B  
e$B%3%\_%C%H$,%m%9%H$7$J$-$c$$$$$1$I!#e(B

---

<div class="post-metadata">

**Author:** ![okkezSS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/85f322/32.png) [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\
**Post date:** [December 16, 2008, 3:24pm UTC](https://www.ruby-forum.com/t/bug-891-minitest-assertions-assert-instance-of-should-use-object-instance-of/155740/7 "2008-12-16T15:24:04Z")

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okkez e$B$G$9!#e(B

2008/12/16 22:05 Yukihiro M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> e$B$?$@!“e(Bminiteste$B$Oe(BRyan D.e$B$,%a%s%F%J$G$9$+$i!”:#8e$Oe(B  
> ruby-coree$B$K%l%]!\<%H$7$F$$$?$@$/$N$,3N\<B$@$H;W$$$^$9!#:#2s$Ne(B  
> e$B%3%\_%C%H$,%m%9%H$7$J$-$c$$$$$1$I!#e(B

e$B\<!$+$i$Oe(B ruby-core e$B$K%l%]!\<%H$9$k$h$&$K$7$^$9!#e(B