add tests

Author: ablaom

test/obs.jl

@@ -0,0 +1,8 @@
+using Test
+using LearnAPI
+
+@testset "`obs` fallback" begin
+    @test obs("some learner", 42) == 42
+end
+
+true

test/predict_transform.jl

@@ -0,0 +1,27 @@
+using Test
+using LearnAPI
+
+struct Cherry end
+
+LearnAPI.fit(learner::Cherry, data; verbosity=1) = Ref(learner)
+LearnAPI.learner(model::Base.RefValue{Cherry}) = model[]
+LearnAPI.predict(model::Base.RefValue{Cherry}, ::Point, x) = 2x
+@trait Cherry kinds_of_proxy=(Point(),)
+
+struct Ripe end
+
+LearnAPI.fit(learner::Ripe, data; verbosity=1) = Ref(learner)
+LearnAPI.learner(model::Base.RefValue{Ripe}) = model[]
+LearnAPI.predict(model::Base.RefValue{Ripe}, ::Distribution) = "a distribution"
+LearnAPI.features(::Ripe, data) = nothing
+@trait Ripe kinds_of_proxy=(Distribution(),)
+
+@testset "`predict` with no kind of proxy specified" begin
+    model = fit(Cherry(), "junk")
+    @test predict(model, 42) == 84
+
+    model = fit(Ripe(), "junk")
+    @test predict(model) == "a distribution"
+end
+
+true

test/runtests.jl

@@ -4,6 +4,8 @@ test_files = [
     "tools.jl",
     "traits.jl",
     "clone.jl",
+    "predict_transform.jl",
+    "obs.jl",
     "accessor_functions.jl",
     "target_features.jl",
     # "patterns/regression.jl",

test/traits.jl

@@ -71,3 +71,5 @@ import .FruitSalad
 @testset "name" begin
     @test LearnAPI.name(FruitSalad.RedApple(1)) == "RedApple"
 end
+
+true