diff --git a/.travis.yml b/.travis.yml
index 2c42b50..044d093 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,16 +16,22 @@ notifications:
 # Do not build my PR twice.  Use the build on branch.
 if: NOT (type == pull_request AND head_repo == tkf/SteadyStateFit.jl)
 
+before_install:
+  - unset JULIA_PROJECT
+  - julia -e 'using Pkg; pkg"add https://github.com/tkf/Run.jl"'
+install:
+  - julia -e 'using Run; Run.prepare_test()'
+script:
+  - julia -e 'using Run; Run.test()'
 after_success:
-  - julia -e 'using Pkg; Pkg.add("Coverage"); using Coverage; Codecov.submit(process_folder())'
-  - julia -e 'using Pkg; Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder())'
+  - julia -e 'using Run; Run.after_success_test()'
+
 jobs:
   include:
     - stage: Documentation
       julia: 1.2
-      script: julia --project=docs --color=yes -e '
-          using Pkg;
-          Pkg.develop(PackageSpec(path=pwd()));
-          Pkg.instantiate();
-          include("docs/make.jl");'
+      install:
+        - julia -e 'using Run; Run.prepare_docs()'
+      script:
+        - julia -e 'using Run; Run.docs()'
       after_success: skip
diff --git a/src/solvers.jl b/src/solvers.jl
index 3170412..f99f184 100644
--- a/src/solvers.jl
+++ b/src/solvers.jl
@@ -12,32 +12,21 @@ function solve(
     x0 = get(sso.p, sso.parameterlens);
     kwargs...,
 )
-    return Optim.optimize(
+    iter = Optim.optimizing(
         Optim.only_fg!(sso),
         x0,
         method,
-        setupoptions(sso, options);
+        options;
         kwargs...,
     )
+    return Optim.OptimizationResults(_solve!(iter, sso))
 end
 
-# A hacky solution: To use the steady state of the last iteration,
-# `updatesteadystates!` is called via `callback` option.
-
-function setupoptions(sso::SteadyStateObjective, options::Optim.Options)
-    @assert options.show_every == 1
-    options = @set options.extended_trace = true
-    options = @set options.callback = StateUpdater(sso, options.callback)
-    return options
-end
-
-struct StateUpdater{T, C}
-    sso::T
-    callback::C
-end
-
-function (su::StateUpdater)(os)
-    # os :: OptimizationState
-    updatesteadystates!(su.sso, os.metadata["x"])
-    su.callback === nothing ? false : su.callback(os)
+function _solve!(iter, sso)
+    local istate
+    for istate′ in iter
+        istate = istate′
+        updatesteadystates!(sso, Optim.minimizer(istate))
+    end
+    return istate
 end
diff --git a/test/Manifest.toml b/test/Manifest.toml
new file mode 100644
index 0000000..c9ee34a
--- /dev/null
+++ b/test/Manifest.toml
@@ -0,0 +1,443 @@
+# This file is machine-generated - editing it directly is not advised
+
+[[AbstractFFTs]]
+deps = ["LinearAlgebra"]
+git-tree-sha1 = "380e36c66edfa099cd90116b24c1ce8cafccac40"
+uuid = "621f4979-c628-5d54-868e-fcf4e3e8185c"
+version = "0.4.1"
+
+[[ArrayInterface]]
+deps = ["LinearAlgebra", "Requires", "SparseArrays"]
+git-tree-sha1 = "981354dab938901c2b607a213e62d9defa50b698"
+uuid = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
+version = "1.2.1"
+
+[[Base64]]
+uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
+
+[[BinDeps]]
+deps = ["Compat", "Libdl", "SHA", "URIParser"]
+git-tree-sha1 = "12093ca6cdd0ee547c39b1870e0c9c3f154d9ca9"
+uuid = "9e28174c-4ba2-5203-b857-d8d62c4213ee"
+version = "0.8.10"
+
+[[BinaryProvider]]
+deps = ["Libdl", "Logging", "SHA"]
+git-tree-sha1 = "c7361ce8a2129f20b0e05a89f7070820cfed6648"
+uuid = "b99e7846-7c00-51b0-8f62-c81ae34c0232"
+version = "0.5.6"
+
+[[CSTParser]]
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+uuid = "00ebfdb7-1f24-5e51-bd34-a7502290713f"
+version = "0.6.2"
+
+[[Calculus]]
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+git-tree-sha1 = "bd8bbd105ba583a42385bd6dc4a20dad8ab3dc11"
+uuid = "49dc2e85-a5d0-5ad3-a950-438e2897f1b9"
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+
+[[CommonSubexpressions]]
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+uuid = "bbf7d656-a473-5ed7-a52c-81e309532950"
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+
+[[Compat]]
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+git-tree-sha1 = "84aa74986c5b9b898b0d1acaf3258741ee64754f"
+uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
+version = "2.1.0"
+
+[[Conda]]
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+
+[[DataAPI]]
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+
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+
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+
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+
+[[DiffEqBase]]
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+git-tree-sha1 = "6005d11da7617b65b77c5c310dc9494dab03b559"
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+
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+
+[[DiffResults]]
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+
+[[DiffRules]]
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+
+[[Distances]]
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+[[Distributed]]
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+
+[[DocStringExtensions]]
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+[[FFTW]]
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+[[FillArrays]]
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+
+[[ForwardDiff]]
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+git-tree-sha1 = "4c4d727f1b7e0092134fabfab6396b8945c1ea5b"
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+[[FunctionWrappers]]
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+[[InteractiveUtils]]
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+[[TimerOutputs]]
+deps = ["Crayons", "Printf", "Test", "Unicode"]
+git-tree-sha1 = "b80671c06f8f8bae08c55d67b5ce292c5ae2660c"
+uuid = "a759f4b9-e2f1-59dc-863e-4aeb61b1ea8f"
+version = "0.5.0"
+
+[[Tokenize]]
+git-tree-sha1 = "dfcdbbfb2d0370716c815cbd6f8a364efb6f42cf"
+uuid = "0796e94c-ce3b-5d07-9a54-7f471281c624"
+version = "0.5.6"
+
+[[TreeViews]]
+deps = ["Test"]
+git-tree-sha1 = "8d0d7a3fe2f30d6a7f833a5f19f7c7a5b396eae6"
+uuid = "a2a6695c-b41b-5b7d-aed9-dbfdeacea5d7"
+version = "0.3.0"
+
+[[URIParser]]
+deps = ["Test", "Unicode"]
+git-tree-sha1 = "6ddf8244220dfda2f17539fa8c9de20d6c575b69"
+uuid = "30578b45-9adc-5946-b283-645ec420af67"
+version = "0.4.0"
+
+[[UUIDs]]
+deps = ["Random", "SHA"]
+uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
+
+[[Unicode]]
+uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
+
+[[VersionParsing]]
+deps = ["Compat"]
+git-tree-sha1 = "c9d5aa108588b978bd859554660c8a5c4f2f7669"
+uuid = "81def892-9a0e-5fdd-b105-ffc91e053289"
+version = "1.1.3"
+
+[[Zygote]]
+deps = ["DiffRules", "FFTW", "FillArrays", "ForwardDiff", "IRTools", "InteractiveUtils", "LinearAlgebra", "MacroTools", "NNlib", "NaNMath", "Random", "Requires", "SpecialFunctions", "Statistics", "ZygoteRules"]
+git-tree-sha1 = "d21e86576e25e4adc09631b34651798775fba99a"
+uuid = "e88e6eb3-aa80-5325-afca-941959d7151f"
+version = "0.3.4"
+
+[[ZygoteRules]]
+deps = ["MacroTools"]
+git-tree-sha1 = "def5f96ac2895fd9b48435f6b97020979ee0a4c6"
+uuid = "700de1a5-db45-46bc-99cf-38207098b444"
+version = "0.1.0"
diff --git a/test/Project.toml b/test/Project.toml
new file mode 100644
index 0000000..2de06b5
--- /dev/null
+++ b/test/Project.toml
@@ -0,0 +1,6 @@
+[deps]
+DiffEqBase = "2b5f629d-d688-5b77-993f-72d75c75574e"
+Optim = "429524aa-4258-5aef-a3af-852621145aeb"
+Setfield = "efcf1570-3423-57d1-acb7-fd33fddbac46"
+SteadyStateFit = "ba0d49fa-da6a-49e1-9b97-8e3acd38c522"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"