floatapprox.jl

# Floating point numbers - basic tests
@test isapprox(4.00000000000001, 4.0)
@test isapprox(5.0,4.999999999999993)
@test !isapprox(4.000000002, 4.00300002)

# Other tolerance levels
@test isapprox(4.32, 4.3; rtol=0.1, atol=0.01)
@test isapprox(1.001, 1.002; rtol=0.001, atol=0.0001)
@test !isapprox(4.5, 4.9; rtol=0.001, atol=0.001)

# Complex numbers
@test isapprox(1.0 + 1.0im, 1.0 + 1.00000000000001im)
@test isapprox(0.9999999999999 + 1.0im, 1.0 + 1.000000000000001im)
@test isapprox(0.9999 + 1.0im, 1.0 + 1.1im; rtol = 0.0001, atol=1.1)

# Complex <-> reals
@test isapprox(1.0 + 0im, 1.0000000000001)
@test isapprox(0.9999999999999, 1.0 + 0im)
@test !isapprox(1.0+1im, 1.000000000000001)

# Comparing NaNs
@test !isapprox(4.0,NaN)
@test !isapprox(NaN,4.0)
@test !isapprox(complex(2.3,NaN), complex(NaN,2.3))
@test !isapprox(NaN, NaN)
@test !isapprox(complex(NaN,NaN), complex(NaN,NaN))
@test !isapprox(complex(NaN,2.3), complex(NaN,2.3))
@test !isapprox(complex(2.3,NaN), complex(2.3,NaN))

# Tests for integers and rationals
@test isapprox(4,4)
@test isapprox(4,5; atol=1)
@test !isapprox(4,6; atol=1)
@test !isapprox(4,5)

@test isapprox(1//2+3im, 1//2+3im)
@test isapprox(1//3, 0.33333333333333333)
@test isapprox(1//3, 0.3333; rtol=0.0001, atol=0.0001)
@test isapprox(1+1im, 1im+1)

# Notably missing from this test suite at the moment
# * Tests for other magnitudes of numbers - very small, very big, and combinations of small and big
# * Tests for various odd combinations of types, e.g. isapprox(x::Integer, y::Rational)