Update tests for SCS.jl@2

[odow]

No description provided.

[odow]

The SCS issue is unrelated to POI:

julia> import SCS

julia> import MathOptInterface as MOI

julia> model = MOI.instantiate(SCS.Optimizer; with_cache_type = Float64)
MOIU.CachingOptimizer
├ state: EMPTY_OPTIMIZER
├ mode: AUTOMATIC
├ model_cache: MOIU.UniversalFallback{MOIU.GenericModel{Float64, MOIU.ObjectiveContainer{Float64}, MOIU.VariablesContainer{Float64}, MOIU.MatrixOfConstraints{Float64, MOIU.MutableSparseMatrixCSC{Float64, Int64, MOIU.ZeroBasedIndexing}, SCS._SetConstants{Float64}, SCS._Cones{Float64}}}}
│ ├ ObjectiveSense: FEASIBILITY_SENSE
│ ├ ObjectiveFunctionType: MOI.ScalarAffineFunction{Float64}
│ ├ NumberOfVariables: 0
│ └ NumberOfConstraints: 0
└ optimizer: SCS.Optimizer
  ├ ObjectiveSense: unknown
  ├ ObjectiveFunctionType: unknown
  ├ NumberOfVariables: unknown
  └ NumberOfConstraints: unknown

julia> x = MOI.add_variable(model)
MOI.VariableIndex(1)

julia> f = MOI.Utilities.vectorize([1.0 * x - 1.0])
┌                               ┐
│-1.0 + 1.0 MOI.VariableIndex(1)│
└                               ┘

julia> c = MOI.add_constraint(model, f, MOI.Nonnegatives(1))
MathOptInterface.ConstraintIndex{MathOptInterface.VectorAffineFunction{Float64}, MathOptInterface.Nonnegatives}(1)

julia> MOI.modify(model, c, MOI.MultirowChange(x, [(1, 2.0)]))
ERROR: MathOptInterface.ModifyConstraintNotAllowed{MathOptInterface.VectorAffineFunction{Float64}, MathOptInterface.Nonnegatives, MathOptInterface.MultirowChange{Float64}}:

## Cause

Modifying the constraints MathOptInterface.ConstraintIndex{MathOptInterface.VectorAffineFunction{Float64}, MathOptInterface.Nonnegatives}(1) with MathOptInterface.MultirowChange{Float64}(MOI.VariableIndex(1), [(1, 2.0)]) cannot be performed

## Fixing this error

An `MOI.NotAllowedError` error occurs when you have tried to do something that
is not implemented by the solver.

The most common way to fix this error is to wrap the optimizer in a
`MOI.Utilities.CachingOptimizer`.

For example, if you are using `JuMP.Model` or `JuMP.set_optimizer`, do:
```julia
model = JuMP.Model(optimizer; with_cache_type = Float64)
model = JuMP.GenericModel{T}(optimizer; with_cache_type = T)
JuMP.set_optimizer(model, optimizer; with_cache_type = Float64)
```
Similarly, if you are using `MOI.instantiate`, do:
```julia
model = MOI.instantiate(optimizer; with_cache_type = Float64)
```

Stacktrace:
 [1] throw_modify_not_allowed(ci::MathOptInterface.ConstraintIndex{…}, args::MathOptInterface.MultirowChange{…})
   @ MathOptInterface ~/.julia/dev/MathOptInterface/src/modifications.jl:37
 [2] modify(model::MathOptInterface.Utilities.MatrixOfConstraints{…}, ci::MathOptInterface.ConstraintIndex{…}, change::MathOptInterface.MultirowChange{…})
   @ MathOptInterface ~/.julia/dev/MathOptInterface/src/modifications.jl:108
 [3] modify(model::MathOptInterface.Utilities.GenericModel{…}, ci::MathOptInterface.ConstraintIndex{…}, change::MathOptInterface.MultirowChange{…})
   @ MathOptInterface.Utilities ~/.julia/dev/MathOptInterface/src/Utilities/model.jl:565
 [4] modify(uf::MathOptInterface.Utilities.UniversalFallback{…}, ci::MathOptInterface.ConstraintIndex{…}, change::MathOptInterface.MultirowChange{…})
   @ MathOptInterface.Utilities ~/.julia/dev/MathOptInterface/src/Utilities/universalfallback.jl:863
 [5] modify(m::MathOptInterface.Utilities.CachingOptimizer{…}, cindex::MathOptInterface.ConstraintIndex{…}, change::MathOptInterface.MultirowChange{…})
   @ MathOptInterface.Utilities ~/.julia/dev/MathOptInterface/src/Utilities/cachingoptimizer.jl:596
 [6] top-level scope
   @ REPL[74]:1
Some type information was truncated. Use `show(err)` to see complete types.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.62%. Comparing base (4f90a84) to head (81361a0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #216   +/-   ##
=======================================
  Coverage   99.62%   99.62%           
=======================================
  Files           9        9           
  Lines        1878     1882    +4     
=======================================
+ Hits         1871     1875    +4     
  Misses          7        7           

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