Update tests for changebasis

[hyrodium]

This PR fixes #346.

Before this PR

julia> using BasicBSpline

julia> P = BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))
BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))

julia> P′ = BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))
BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))

julia> changebasis_I(P, P′)
6×10 SparseArrays.SparseMatrixCSC{Float64, Int32} with 27 stored entries:
   ⋅    2.8   0.4    ⋅    ⋅    ⋅     ⋅     ⋅     ⋅     ⋅ 
   ⋅   -4.4   2.0   0.8   ⋅    ⋅     ⋅     ⋅     ⋅     ⋅ 
  2.8   2.8  -1.6   0.4  0.8  0.45  0.05  0.05  0.05  0.05
 -0.2  -0.2   0.2  -0.2  0.2  0.5   0.5   0.5   0.5   0.5
   ⋅     ⋅     ⋅     ⋅    ⋅   0.05  0.45   ⋅     ⋅     ⋅ 
   ⋅     ⋅     ⋅     ⋅    ⋅    ⋅     ⋅     ⋅     ⋅     ⋅ 

After this PR

julia> using BasicBSpline

julia> P = BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))
BSplineSpace{4, Int64, KnotVector{Int64}}(KnotVector([1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 7]))

julia> P′ = BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))
BSplineSpace{5, Int64, KnotVector{Int64}}(KnotVector([1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6]))

julia> changebasis_I(P, P′)
6×10 SparseMatrixCSC{Float64, Int32} with 19 stored entries:
  ⋅    2.8   0.4    ⋅    ⋅    ⋅     ⋅     ⋅    ⋅    ⋅ 
  ⋅   -4.4   2.0   0.8   ⋅    ⋅     ⋅     ⋅    ⋅    ⋅ 
  ⋅    2.8  -1.6   0.4  0.8  0.45  0.05   ⋅    ⋅    ⋅ 
  ⋅   -0.2   0.2  -0.2  0.2  0.5   0.5    ⋅    ⋅    ⋅ 
  ⋅     ⋅     ⋅     ⋅    ⋅   0.05  0.45   ⋅    ⋅    ⋅ 
  ⋅     ⋅     ⋅     ⋅    ⋅    ⋅     ⋅     ⋅    ⋅    ⋅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a649f92) 96.43% compared to head (4538c3d) 96.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
- Coverage   96.43%   96.13%   -0.31%     
==========================================
  Files          14       14              
  Lines        1571     1603      +32     
==========================================
+ Hits         1515     1541      +26     
- Misses         56       62       +6     

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