# This file is a part of JuliaFEM.
# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md

using JuliaFEM.Test

using JuliaFEM.Core: DCTV, DCTI

@testset "test interpolation of discrete constant time-variant field" begin
    f = DCTV(0.0 => 0.0, 1.0 => 1.0)
    # time interpolation of time-variant fields results it's
    # time-invariant counterpart
    @test isapprox(f(-1.0), DCTI(0.0))
    @test isapprox(f( 0.0), DCTI(0.0))
    @test isapprox(f( 0.3), DCTI(0.3))
    @test isapprox(f( 0.5), DCTI(0.5))
    @test isapprox(f( 0.9), DCTI(0.9))
    @test isapprox(f( 1.0), DCTI(1.0))
    @test isapprox(f( 1.5), DCTI(1.0))
end