laws testing: add insert/delete, generalize modify (#136)

* combine insert & delete tests into one file
* add test_insertdelete_laws
* generalize test_modify_law
* extend docstrings
* call test_modify_law

ext/AccessorsTestExt.jl

@@ -16,14 +16,25 @@ function Accessors.test_getset_laws(lens, obj, val1, val2; cmp=(==))
     obj12 = set(obj1, lens, val2)
     obj2 = set(obj12, lens, val2)
     @test cmp(obj12, obj2)
+
+    Accessors.test_modify_law(identity, lens, obj; cmp)
 end
 
-function Accessors.test_modify_law(f, lens, obj)
+function Accessors.test_modify_law(f, lens, obj; cmp=(==))
     obj_modify = modify(f, obj, lens)
-    old_val = lens(obj)
-    val = f(old_val)
-    obj_setfget = set(obj, lens, val)
-    @test obj_modify == obj_setfget
+    old_vals = getall(obj, lens)
+    vals = map(f, old_vals)
+    obj_setfget = setall(obj, lens, vals)
+    @test cmp(obj_modify, obj_setfget)
+end
+
+function Accessors.test_insertdelete_laws(lens, obj, val; cmp=(==))
+    obj1 = insert(obj, lens, val)
+    @test cmp(lens(obj1), val)
+    obj2 = set(obj1, lens, val)
+    @test cmp(obj1, obj2)
+    obj3 = delete(obj1, lens)
+    @test cmp(obj, obj3)
 end
 
 function Accessors.test_getsetall_laws(optic, obj, vals1, vals2; cmp=(==))
@@ -39,6 +50,8 @@ function Accessors.test_getsetall_laws(optic, obj, vals1, vals2; cmp=(==))
     obj12 = setall(obj1, optic, vals2)
     obj2 = setall(obj12, optic, vals2)
     @test obj12 == obj2
+
+    Accessors.test_modify_law(identity, optic, obj; cmp)
 end
 
 end

src/optics.jl

@@ -34,13 +34,20 @@ function modify end
 
 Replace a part according to `optic` of `obj` by `val`.
 
+For a callable `optic`, this law defines the `set` operation: `optic(set(obj, optic, val)) == val` (for an appropriate notion of equality).
+
 ```jldoctest
 julia> using Accessors
 
 julia> obj = (a=1, b=2); lens=@optic _.a; val = 100;
 
 julia> set(obj, lens, val)
 (a = 100, b = 2)
+
+julia> lens = Elements();
+
+julia> set(obj, lens, val)
+(a = 100, b = 100)
 ```
 See also [`modify`](@ref).
 """
@@ -51,14 +58,29 @@ function set end
 
 Delete a part according to `optic` of `obj`.
 
+Note that `optic(delete(obj, optic))` can still have a valid value: for example, when deleting an element from a `Tuple` or `Vector`.
+
 ```jldoctest
 julia> using Accessors
 
 julia> obj = (a=1, b=2); lens=@optic _.a;
 
-julia> delete(obj, lens)
+julia> obj_d = delete(obj, lens)
 (b = 2,)
+
+julia> lens(obj_d)
+ERROR: type NamedTuple has no field a
+
+
+julia> obj = (1, 2); lens=first;
+
+julia> obj_d = delete(obj, lens)
+(2,)
+
+julia> lens(obj_d)
+2
 ```
+See also [`set`](@ref), [`insert`](@ref).
 """
 function delete end
 
@@ -67,6 +89,8 @@ function delete end
 
 Insert a part according to `optic` into `obj` with the value `val`.
 
+For a callable `optic`, this law defines the `insert` operation: `optic(insert(obj, optic, val)) == val` (for an appropriate notion of equality).
+
 ```jldoctest
 julia> using Accessors
 
@@ -75,7 +99,7 @@ julia> obj = (a=1, b=2); lens=@optic _.c; val = 100;
 julia> insert(obj, lens, val)
 (a = 1, b = 2, c = 100)
 ```
-See also [`set`](@ref).
+See also [`set`](@ref), [`delete`](@ref).
 """
 function insert end
 

src/testing.jl

@@ -3,3 +3,4 @@
 function test_getset_laws end
 function test_modify_law end
 function test_getsetall_laws end
+function test_insertdelete_laws end

test/runtests.jl

@@ -8,8 +8,7 @@ PerformanceTestTools.@include("perf.jl")
 include("test_examples.jl")
 include("test_core.jl")
 include("test_optics.jl")
-include("test_delete.jl")
-include("test_insert.jl")
+include("test_insert_delete.jl")
 include("test_extensions.jl")
 include("test_quicktypes.jl")
 include("test_setmacro.jl")

test/test_extensions.jl

@@ -1,7 +1,7 @@
 module TestExtensions
 using Test
 using Accessors
-using Accessors: test_getset_laws
+using Accessors: test_getset_laws, test_insertdelete_laws
 using AxisKeys
 using IntervalSets
 using StaticArrays, StaticNumbers
@@ -122,6 +122,9 @@ end
     end
     test_getset_laws(SVector, (0, 1), SVector('x', 'y'), SVector(1, 2); cmp=cmp)
     test_getset_laws(MVector, (0, 1), MVector('x', 'y'), MVector(1, 2); cmp=cmp)
+
+    test_insertdelete_laws((@optic _[1]), SVector(1), 2)
+    test_insertdelete_laws((@optic _[2]), SVector(1), 2)
 end
 
 
@@ -139,6 +142,7 @@ VERSION >= v"1.9-" && @testset "StructArrays" begin
     @test sb.:2 === 10:12
     ss = @delete sb.:2
     @test ss.:1 === s.:1
+    test_insertdelete_laws((@optic _.:2), s, 10:12)
 
     s = StructArray(a=[1, 2, 3])
     sb = @insert StructArrays.components(s).b = 10:12
@@ -161,6 +165,7 @@ VERSION >= v"1.9-" && @testset "StructArrays" begin
     @test @insert(s.b = 10:11)::StructArray == [(a=(x=1, y=:abc), b=10), (a=(x=2, y=:def), b=11)]
     @test @insert(s.a.z = 10:11)::StructArray == [(a=(x=1, y=:abc, z=10),), (a=(x=2, y=:def, z=11),)]
     @test @delete(s.a.y)::StructArray == [(a=(x=1,),), (a=(x=2,),)]
+    test_insertdelete_laws((@optic _.a.z), s, ["a", "b"])
 
     s = StructArray([S(1, 2), S(3, 4)])
     @test @inferred(set(s, PropertyLens(:a), 10:11))::StructArray == StructArray([S(10, 2), S(11, 4)])

test/test_functionlenses.jl

@@ -5,7 +5,7 @@ using Unitful
 using LinearAlgebra: norm, diag
 using AxisKeys
 using InverseFunctions: inverse
-using Accessors: test_getset_laws, test_modify_law
+using Accessors: test_getset_laws, test_modify_law, test_insertdelete_laws
 using Accessors
 
 
@@ -159,6 +159,7 @@ end
     B = @insert size(A)[2] = 1
     @test reshape(A, (2, 1, 3)) == B
     @test A == @delete size(B)[2]
+    test_insertdelete_laws((@optic size(_)[2]), A, 1)
     @test_throws Exception @set size(A)[1] = 1
     @test_throws Exception @insert size(A)[2] = 2
 

test/test_getsetall.jl

@@ -1,7 +1,7 @@
 module TestGetSetAll
 using Test
 using Accessors
-using Accessors: test_getsetall_laws
+using Accessors: test_getsetall_laws, test_modify_law
 using StaticNumbers
 using StaticArrays
 
@@ -155,14 +155,15 @@ end
     @test_broken ([1, 2], [3.0, 4.0, 5.0], ("6",)) == @inferred setall(obj, @optic(_ |> Elements() |> Elements()), (1, 2, 3., 4., 5., "6"))
 end
 
-@testset "getall/setall consistency" begin
+@testset "getall-setall laws" begin
     for (optic, obj, vals1, vals2) in [
-            (Elements(), (1, "2"), (2, 3), (4, 5)),
-            (Properties(), (a=1, b="2"), (2, 3), (4, 5)),
+            (Elements(), (1, false), (2, 3), (4, 5)),
+            (Properties(), (a=1, b=false), (2, 3), (4, 5)),
             (If(x -> x isa Number) ∘ Properties(), (a=1, b="2"), (2,), (4,)),
             (@optic(_.b |> Elements() |> Properties() |> _ * 3), (a=1, b=((c=3, d=4), (c=5, d=6))), 1:4, (-9, -12, -15, -18)),
         ]
         test_getsetall_laws(optic, obj, vals1, vals2)
+        test_modify_law(x -> x + 1, optic, obj)
     end
 end
 

test/test_delete.jl → test/test_insert_delete.jl

@@ -1,7 +1,73 @@
-module TestDelete
+module TestInsertDelete
 using Test
-using Accessors
 using StaticArrays
+using Accessors
+using Accessors: insert
+using Accessors: test_insertdelete_laws
+
+
+@testset "test insert" begin
+    @testset "function" begin
+        @test @inferred(insert( (b=2, c=3), @optic(_.a), 1 )) == (b=2, c=3, a=1)
+        @test insert( (b=2, c=3), @optic(_[:a]), 1 ) == (b=2, c=3, a=1)
+        let A = [1, 2]
+            @test insert(A, @optic(_[2]), 3) == [1, 3, 2]
+            @test_throws BoundsError insert(A, @optic(_[4]), 3)
+            @test_throws Exception insert(A, @optic(_[1, 3]), 3)
+            @test insert(A, first, 3) == [3, 1, 2]
+            @test insert(A, @optic(first(_, 2)), [3, 4]) == [3, 4, 1, 2]
+            @test insert(A, @optic(last(_, 2)), [3, 4]) == [1, 2, 3, 4]
+            @test A == [1, 2]  # not changed
+        end
+        @test @inferred(insert(CartesianIndex(1, 2, 3), @optic(_[2]), 4)) == CartesianIndex(1, 4, 2, 3)
+        @test insert((1,2), last, 3) == (1, 2, 3)
+        @inferred(insert((1,2), last, 3))
+        @test @inferred(insert(SVector(1,2), @optic(_[1]), 3)) == SVector(3, 1, 2)
+        @test @inferred(insert(SVector(1,2), last, 3)) == SVector(1, 2, 3)
+        let D = Dict(:a => 1)
+            @test insert(D, @optic(_[:b]), 2) == Dict(:a => 1, :b => 2)
+            @test D == Dict(:a => 1)  # not changed
+        end
+        @test insert((a=1, b=(2, 3)), @optic(_.b[2]), "xxx") === (a=1, b=(2, "xxx", 3))
+        @test_broken begin
+            @inferred insert((a=1, b=(2, 3)), @optic(_.b[2]), "xxx")
+            true
+        end
+        @test @inferred(insert((1, 2), @optic(_[1]), 3)) == (3, 1, 2)
+    end
+
+    @testset "macro" begin
+        x = (b=2, c=3)
+        @test @insert(x.a = 1) === (b=2, c=3, a=1)
+        @test @insert(x[(:a, :x)] = (1, :xyz)) === (b=2, c=3, a=1, x=:xyz)
+        @test @insert(x[(:a, :x)] = (x=:xyz, a=1)) === (b=2, c=3, a=1, x=:xyz)
+        x = [1, 2]
+        @test @insert(x[3] = 3) == [1, 2, 3]
+        x = (a=(b=(1, 2),), c=1)
+        @test @insert(x.a.b[1] = 0) == (a=(b=(0, 1, 2),), c=1)
+
+        # inferred & constant-propagated:
+        function doit(nt)
+            nt = @delete nt[1]
+            nt = @insert nt[:a] =1
+            nt = @delete nt[(:a, :c)]
+            nt = @insert nt[(:x, :y)] = ("def", :abc)
+            return nt
+        end
+        @test @inferred(doit((a='3', b=2, c="1"))) === (b=2, x="def", y=:abc)
+
+        x = (1, 2)
+        @test [@insert(x[3] = 3)] == [(1, 2, 3)]
+
+        A = [(x=1, y=2), (x=3, y=4)]
+        @test @insert(Elements()(A).z = 5) == [(x=1, y=2, z=5), (x=3, y=4, z=5)]
+    end
+
+    @testset "friendly error" begin
+        res = @test_throws ArgumentError Accessors.insertmacro(identity, :(obj.prop == val))
+        @test occursin("obj.prop == val", res.value.msg)
+    end
+end
 
 @testset "test delete" begin
     @testset "function" begin
@@ -73,4 +139,15 @@ using StaticArrays
     end
 end
 
+@testset "insert-delete laws" begin
+    test_insertdelete_laws((@o _.c), (a=1, b=2), "3")
+    @testset for o in ((@o _[2]), (@o _[3]), first, last), obj in ((1, 2), [1, 2])
+        test_insertdelete_laws(o, obj, 3)
+    end
+    @testset for o in ((@o _.a[2]), (@o _.a[3]), (@o first(_.a)), (@o last(_.a)))
+        test_insertdelete_laws(o, (a=(1, 2),), "3")
+    end
+    test_insertdelete_laws((@o first(_, 2)), [1, 2, 3], [4, 5])
+end
+
 end