[Tarantool-patches] [PATCH luajit 1/5] test: introduce `samevalues()` TAP checker

[Igor Munkin]

Sergey,

<snipped>

> > > > The introduced `samevalues()` helper checks that values in range from
> > > > 1, to `table.maxn()` of the given table are exactly the same. It may be
> > > > usefull for test consistency of JIT and VM behaviour. Originally, the
> > > > `arr_is_consistent()` function was introduced in the
> > > > <tarantool-tests/gh-6163-min-max.test.lua>. `samevalues()` has the same
> > > > functionallity (except usage of `table.maxn()` instead `#` operator to
> > > > be sure, that the table we check isn't a sparse array).
> > > I would rename samevalues to something like assert_equals or
> > > assert_items_equals just because
> > > 
> > > similar functions are named in unit testing frameworks and helpers with
> > > prefix assert_
> > As you can see we use naming without _ for exported function in the
> > <tap.lua> module, so additional one with strange naming will be
> > inconsistent.
> > 
> > Also, discussed this naming with Igor and Max offline and this name is
> > OK for them, feel free also to CC Igor to discuss:).
> > 
> > > more readable from my point of view. See names for assertions in luatest
> > > [1] and JUnit (popular unit testing framework).
> > > 
> > > 
> > > 1. https://github.com/tarantool/luatest#list-of-luatest-functions
> > > 
> > > 2.
> > > https://junit.org/junit5/docs/5.0.1/api/org/junit/jupiter/api/Assertions.html
> > > 
> > > 
> Igor, what do you think regarding naming of the introduced function?

Frankly speaking, it was me, who originally suggested this name (AFAIR,
but Sergey K. might correct me if I'm wrong), so I'm totally fine with
the naming and here why:
1. There are no functions named in the style you're referring to above.
   This may relate to luatest, but definitely not to our version of
   tap.lua module.
2. All the names *except* <is_deeply> for some historical reasons (and
   due to many Python lovers, that worked in Tarantool, I guess) are
   named in so-called "Lua-way" (you can see many examples in Lua
   Reference Manual or in popular Lua modules): short name with in lower
   case with no separators like underscore or other. This applies to
   <samevalues> too.
3. As for me <assert_items_equals> should validate all the items in
   table against the one *expected*, however <samevalues> just checks
   that the table consists of the same values, but nobody has to know
   this particular value.

All in all, I'm OK with the current name, since it fits to the current
naming policy. However, I'm open to other options regarding the
assertion module to be used in our testing suite (of course, out of the
scope of this series).

-- 
Best regards,
IM