Add doc and tests

Author: blegat

src/Bridges/Constraint/bridges/functionize.jl

@@ -187,6 +187,8 @@ for these pairs of functions:
  * [`MOI.ScalarQuadraticFunction`](@ref)  to [`MOI.ScalarNonlinearFunction`](@ref)
  * [`MOI.VectorAffineFunction`](@ref) to [`MOI.VectorQuadraticFunction`](@ref)
 
+See also [`SetConversionBridge`](@ref).
+
 ## Source node
 
 `FunctionConversionBridge` supports:

src/Bridges/Constraint/bridges/set_conversion.jl

@@ -1,3 +1,26 @@
+"""
+    SetConversionBridge{T,S2,S1,F} <:
+        MOI.Bridges.Constraint.SetMapBridge{T,S2,S1,F,F}
+
+`SetConversionBridge` implements the following reformulations:
+
+  * ``f(x) \\in S1`` into ``f(x) \\in S2``
+
+See also [`FunctionConversionBridge`](@ref).
+
+## Source node
+
+`SetConversionBridge` supports:
+
+  * `F` in `S1`
+
+## Target nodes
+
+`SetConversionBridge` creates:
+
+  * `F` in `S2`
+"""
+
 struct SetConversionBridge{T,S2,S1,F} <:
        MOI.Bridges.Constraint.SetMapBridge{T,S2,S1,F,F}
     constraint::MOI.ConstraintIndex{F,S2}

test/Bridges/Constraint/set_conversion.jl

@@ -0,0 +1,48 @@
+# Copyright (c) 2017: Miles Lubin and contributors
+# Copyright (c) 2017: Google Inc.
+#
+# Use of this source code is governed by an MIT-style license that can be found
+# in the LICENSE.md file or at https://opensource.org/licenses/MIT.
+
+module TestConstraintSetConversion
+
+using Test
+
+import MathOptInterface as MOI
+
+function runtests()
+    for name in names(@__MODULE__; all = true)
+        if startswith("$(name)", "test_")
+            @testset "$(name)" begin
+                getfield(@__MODULE__, name)()
+            end
+        end
+    end
+    return
+end
+
+struct Zero <: MOI.AbstractScalarSet
+end
+
+MOI.Bridges.Constraint.conversion_cost(::Type{MOI.EqualTo{Float64}}, ::Type{Zero}) = 1.0
+
+Base.convert(::Type{MOI.EqualTo{Float64}}, ::Zero) = MOI.EqualTo(0.0)
+
+function test_runtests()
+    MOI.Bridges.runtests(
+        MOI.Bridges.Constraint.ScalarFunctionizeBridge,
+        model -> begin
+            x = MOI.add_variable(model)
+            MOI.add_constraint(model, Zero())
+        end,
+        model -> begin
+            x = MOI.add_variable(model)
+            MOI.add_constraint(model, MOI.EqualTo(0.0))
+        end,
+    )
+    return
+end
+
+end  # module
+
+TestConstraintSetConversion.runtests()