Elixir - testing a full script












0














I'm writing a test to check a function (called automatically by GenServer when a new file enters a folder) that calls other functions in the same module with pipes in order to read a file, process its content to insert it if needed and returns a list (:errors and :ok maps).



results looks like :



[
error: "Data not found",
ok: %MyModule{
field1: field1data,
field2: field2data
},
ok: %MyModule{
field1: field1data,
field2: field2data
},
error: "Data not found"


the code :



  def processFile(file) do
insertResultsMap =
File.read!(file)
|> getLines()
|> extractMainData()
|> Enum.map(fn(x) -> insertLines(x) end)
|> Enum.group_by(fn x -> elem(x, 0) end)

handleErrors(Map.get(insertResultsMap, :error))
updateAnotherTableWithLines(Map.get(insertResultsMap, :ok))
end

defp getLines(docContent) do
String.split(docContent, "n")
end

defp extractMainData(docLines) do
Enum.map(fn(x) -> String.split(x, ",") end)
end

defp insertLines([field1, field2, field3, field4]) do
Attrs = %{
field1: String.trim(field1),
field2: String.trim(field2),
field3: String.trim(field3),
field4: String.trim(field4)
}

mymodule.create_stuff(Attrs)
end

defp handleErrors(errors) do
{:ok, file} = File.open(@errorsFile, [:append])
saveErrors(file, errors)
File.close(file)
end

defp saveErrors(_, ), do: :ok
defp saveErrors(file, [{:error, changeset}|rest]) do
changes = for {key, value} <- changeset.changes do
"#{key} #{value}"
end
errors = for {key, {message, _}} <- changeset.errors do
"#{key} #{message}"
end

errorData = "data: #{Enum.join(changes, ", ")} nErrors: #{Enum.join(errors, ", ")}nn"

IO.binwrite(file, errorData)
saveErrors(file, rest)
end

defp updateAnotherTableWithLines(insertedLines) do
Enum.map(insertedLines, fn {:ok, x} -> updateOtherTable(x) end)
end

defp updateOtherTable(dataForUpdate) do
"CLOSE" -> otherModule.doStuff(dataForUpdate.field1, dataForUpdate.field2)
end


I have several questions, and some will be pretty basic since I'm still learning :




  • What do you think of the code ? Any advices ? (take into account I voluntarily obfuscated names).

  • If I want to test this, is it the right way to test only processFile function ? Or should I make public more of them and test them individually ?

  • When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}" ?










share|improve this question



























    0














    I'm writing a test to check a function (called automatically by GenServer when a new file enters a folder) that calls other functions in the same module with pipes in order to read a file, process its content to insert it if needed and returns a list (:errors and :ok maps).



    results looks like :



    [
    error: "Data not found",
    ok: %MyModule{
    field1: field1data,
    field2: field2data
    },
    ok: %MyModule{
    field1: field1data,
    field2: field2data
    },
    error: "Data not found"


    the code :



      def processFile(file) do
    insertResultsMap =
    File.read!(file)
    |> getLines()
    |> extractMainData()
    |> Enum.map(fn(x) -> insertLines(x) end)
    |> Enum.group_by(fn x -> elem(x, 0) end)

    handleErrors(Map.get(insertResultsMap, :error))
    updateAnotherTableWithLines(Map.get(insertResultsMap, :ok))
    end

    defp getLines(docContent) do
    String.split(docContent, "n")
    end

    defp extractMainData(docLines) do
    Enum.map(fn(x) -> String.split(x, ",") end)
    end

    defp insertLines([field1, field2, field3, field4]) do
    Attrs = %{
    field1: String.trim(field1),
    field2: String.trim(field2),
    field3: String.trim(field3),
    field4: String.trim(field4)
    }

    mymodule.create_stuff(Attrs)
    end

    defp handleErrors(errors) do
    {:ok, file} = File.open(@errorsFile, [:append])
    saveErrors(file, errors)
    File.close(file)
    end

    defp saveErrors(_, ), do: :ok
    defp saveErrors(file, [{:error, changeset}|rest]) do
    changes = for {key, value} <- changeset.changes do
    "#{key} #{value}"
    end
    errors = for {key, {message, _}} <- changeset.errors do
    "#{key} #{message}"
    end

    errorData = "data: #{Enum.join(changes, ", ")} nErrors: #{Enum.join(errors, ", ")}nn"

    IO.binwrite(file, errorData)
    saveErrors(file, rest)
    end

    defp updateAnotherTableWithLines(insertedLines) do
    Enum.map(insertedLines, fn {:ok, x} -> updateOtherTable(x) end)
    end

    defp updateOtherTable(dataForUpdate) do
    "CLOSE" -> otherModule.doStuff(dataForUpdate.field1, dataForUpdate.field2)
    end


    I have several questions, and some will be pretty basic since I'm still learning :




    • What do you think of the code ? Any advices ? (take into account I voluntarily obfuscated names).

    • If I want to test this, is it the right way to test only processFile function ? Or should I make public more of them and test them individually ?

    • When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}" ?










    share|improve this question

























      0












      0








      0







      I'm writing a test to check a function (called automatically by GenServer when a new file enters a folder) that calls other functions in the same module with pipes in order to read a file, process its content to insert it if needed and returns a list (:errors and :ok maps).



      results looks like :



      [
      error: "Data not found",
      ok: %MyModule{
      field1: field1data,
      field2: field2data
      },
      ok: %MyModule{
      field1: field1data,
      field2: field2data
      },
      error: "Data not found"


      the code :



        def processFile(file) do
      insertResultsMap =
      File.read!(file)
      |> getLines()
      |> extractMainData()
      |> Enum.map(fn(x) -> insertLines(x) end)
      |> Enum.group_by(fn x -> elem(x, 0) end)

      handleErrors(Map.get(insertResultsMap, :error))
      updateAnotherTableWithLines(Map.get(insertResultsMap, :ok))
      end

      defp getLines(docContent) do
      String.split(docContent, "n")
      end

      defp extractMainData(docLines) do
      Enum.map(fn(x) -> String.split(x, ",") end)
      end

      defp insertLines([field1, field2, field3, field4]) do
      Attrs = %{
      field1: String.trim(field1),
      field2: String.trim(field2),
      field3: String.trim(field3),
      field4: String.trim(field4)
      }

      mymodule.create_stuff(Attrs)
      end

      defp handleErrors(errors) do
      {:ok, file} = File.open(@errorsFile, [:append])
      saveErrors(file, errors)
      File.close(file)
      end

      defp saveErrors(_, ), do: :ok
      defp saveErrors(file, [{:error, changeset}|rest]) do
      changes = for {key, value} <- changeset.changes do
      "#{key} #{value}"
      end
      errors = for {key, {message, _}} <- changeset.errors do
      "#{key} #{message}"
      end

      errorData = "data: #{Enum.join(changes, ", ")} nErrors: #{Enum.join(errors, ", ")}nn"

      IO.binwrite(file, errorData)
      saveErrors(file, rest)
      end

      defp updateAnotherTableWithLines(insertedLines) do
      Enum.map(insertedLines, fn {:ok, x} -> updateOtherTable(x) end)
      end

      defp updateOtherTable(dataForUpdate) do
      "CLOSE" -> otherModule.doStuff(dataForUpdate.field1, dataForUpdate.field2)
      end


      I have several questions, and some will be pretty basic since I'm still learning :




      • What do you think of the code ? Any advices ? (take into account I voluntarily obfuscated names).

      • If I want to test this, is it the right way to test only processFile function ? Or should I make public more of them and test them individually ?

      • When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}" ?










      share|improve this question













      I'm writing a test to check a function (called automatically by GenServer when a new file enters a folder) that calls other functions in the same module with pipes in order to read a file, process its content to insert it if needed and returns a list (:errors and :ok maps).



      results looks like :



      [
      error: "Data not found",
      ok: %MyModule{
      field1: field1data,
      field2: field2data
      },
      ok: %MyModule{
      field1: field1data,
      field2: field2data
      },
      error: "Data not found"


      the code :



        def processFile(file) do
      insertResultsMap =
      File.read!(file)
      |> getLines()
      |> extractMainData()
      |> Enum.map(fn(x) -> insertLines(x) end)
      |> Enum.group_by(fn x -> elem(x, 0) end)

      handleErrors(Map.get(insertResultsMap, :error))
      updateAnotherTableWithLines(Map.get(insertResultsMap, :ok))
      end

      defp getLines(docContent) do
      String.split(docContent, "n")
      end

      defp extractMainData(docLines) do
      Enum.map(fn(x) -> String.split(x, ",") end)
      end

      defp insertLines([field1, field2, field3, field4]) do
      Attrs = %{
      field1: String.trim(field1),
      field2: String.trim(field2),
      field3: String.trim(field3),
      field4: String.trim(field4)
      }

      mymodule.create_stuff(Attrs)
      end

      defp handleErrors(errors) do
      {:ok, file} = File.open(@errorsFile, [:append])
      saveErrors(file, errors)
      File.close(file)
      end

      defp saveErrors(_, ), do: :ok
      defp saveErrors(file, [{:error, changeset}|rest]) do
      changes = for {key, value} <- changeset.changes do
      "#{key} #{value}"
      end
      errors = for {key, {message, _}} <- changeset.errors do
      "#{key} #{message}"
      end

      errorData = "data: #{Enum.join(changes, ", ")} nErrors: #{Enum.join(errors, ", ")}nn"

      IO.binwrite(file, errorData)
      saveErrors(file, rest)
      end

      defp updateAnotherTableWithLines(insertedLines) do
      Enum.map(insertedLines, fn {:ok, x} -> updateOtherTable(x) end)
      end

      defp updateOtherTable(dataForUpdate) do
      "CLOSE" -> otherModule.doStuff(dataForUpdate.field1, dataForUpdate.field2)
      end


      I have several questions, and some will be pretty basic since I'm still learning :




      • What do you think of the code ? Any advices ? (take into account I voluntarily obfuscated names).

      • If I want to test this, is it the right way to test only processFile function ? Or should I make public more of them and test them individually ?

      • When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}" ?







      testing pattern-matching elixir phoenix-framework gen-server






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 19 '18 at 15:16









      Jeremy Belolo

      1,15921943




      1,15921943
























          1 Answer
          1






          active

          oldest

          votes


















          1















          What do you think of the code? Any advices? (take into account I voluntarily obfuscated names).




          Opinion based.




          If I want to test this, is it the right way to test only processFile function?




          Yes.




          Or should I make public more of them and test them individually?




          No, this is an implementation detail and testing it is an anti-pattern.




          When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}"?




          You receive a Keyword. To check the explicit value, one might use:



          foo = processFile(file)
          assert not is_nil(foo[:ok])


          OTOH, I’d better return a map from there and pattern match it:



          assert %{ok: _} = processFile(file)




          To assert that the result does not have anything save for :oks and :errors, one might use list subtraction:



          assert Enum.uniq(Keyword.keys(result)) -- [:ok, :error] == 





          share|improve this answer























          • Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
            – Jeremy Belolo
            Nov 19 '18 at 15:46






          • 1




            1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
            – Aleksei Matiushkin
            Nov 19 '18 at 16:44










          • This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
            – Jeremy Belolo
            Nov 20 '18 at 7:52










          • Ah, indeed. Enum.uniq/1 is required.
            – Aleksei Matiushkin
            Nov 20 '18 at 11:31











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          1 Answer
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          active

          oldest

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1















          What do you think of the code? Any advices? (take into account I voluntarily obfuscated names).




          Opinion based.




          If I want to test this, is it the right way to test only processFile function?




          Yes.




          Or should I make public more of them and test them individually?




          No, this is an implementation detail and testing it is an anti-pattern.




          When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}"?




          You receive a Keyword. To check the explicit value, one might use:



          foo = processFile(file)
          assert not is_nil(foo[:ok])


          OTOH, I’d better return a map from there and pattern match it:



          assert %{ok: _} = processFile(file)




          To assert that the result does not have anything save for :oks and :errors, one might use list subtraction:



          assert Enum.uniq(Keyword.keys(result)) -- [:ok, :error] == 





          share|improve this answer























          • Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
            – Jeremy Belolo
            Nov 19 '18 at 15:46






          • 1




            1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
            – Aleksei Matiushkin
            Nov 19 '18 at 16:44










          • This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
            – Jeremy Belolo
            Nov 20 '18 at 7:52










          • Ah, indeed. Enum.uniq/1 is required.
            – Aleksei Matiushkin
            Nov 20 '18 at 11:31
















          1















          What do you think of the code? Any advices? (take into account I voluntarily obfuscated names).




          Opinion based.




          If I want to test this, is it the right way to test only processFile function?




          Yes.




          Or should I make public more of them and test them individually?




          No, this is an implementation detail and testing it is an anti-pattern.




          When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}"?




          You receive a Keyword. To check the explicit value, one might use:



          foo = processFile(file)
          assert not is_nil(foo[:ok])


          OTOH, I’d better return a map from there and pattern match it:



          assert %{ok: _} = processFile(file)




          To assert that the result does not have anything save for :oks and :errors, one might use list subtraction:



          assert Enum.uniq(Keyword.keys(result)) -- [:ok, :error] == 





          share|improve this answer























          • Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
            – Jeremy Belolo
            Nov 19 '18 at 15:46






          • 1




            1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
            – Aleksei Matiushkin
            Nov 19 '18 at 16:44










          • This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
            – Jeremy Belolo
            Nov 20 '18 at 7:52










          • Ah, indeed. Enum.uniq/1 is required.
            – Aleksei Matiushkin
            Nov 20 '18 at 11:31














          1












          1








          1







          What do you think of the code? Any advices? (take into account I voluntarily obfuscated names).




          Opinion based.




          If I want to test this, is it the right way to test only processFile function?




          Yes.




          Or should I make public more of them and test them individually?




          No, this is an implementation detail and testing it is an anti-pattern.




          When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}"?




          You receive a Keyword. To check the explicit value, one might use:



          foo = processFile(file)
          assert not is_nil(foo[:ok])


          OTOH, I’d better return a map from there and pattern match it:



          assert %{ok: _} = processFile(file)




          To assert that the result does not have anything save for :oks and :errors, one might use list subtraction:



          assert Enum.uniq(Keyword.keys(result)) -- [:ok, :error] == 





          share|improve this answer















          What do you think of the code? Any advices? (take into account I voluntarily obfuscated names).




          Opinion based.




          If I want to test this, is it the right way to test only processFile function?




          Yes.




          Or should I make public more of them and test them individually?




          No, this is an implementation detail and testing it is an anti-pattern.




          When I test the processFile function, I check that I'm receiving a list. Any way to make sure this list has only elements I'm waiting for, thus error: "String" or ok: %{}"?




          You receive a Keyword. To check the explicit value, one might use:



          foo = processFile(file)
          assert not is_nil(foo[:ok])


          OTOH, I’d better return a map from there and pattern match it:



          assert %{ok: _} = processFile(file)




          To assert that the result does not have anything save for :oks and :errors, one might use list subtraction:



          assert Enum.uniq(Keyword.keys(result)) -- [:ok, :error] == 






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 20 '18 at 11:31

























          answered Nov 19 '18 at 15:37









          Aleksei Matiushkin

          79.4k95190




          79.4k95190












          • Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
            – Jeremy Belolo
            Nov 19 '18 at 15:46






          • 1




            1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
            – Aleksei Matiushkin
            Nov 19 '18 at 16:44










          • This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
            – Jeremy Belolo
            Nov 20 '18 at 7:52










          • Ah, indeed. Enum.uniq/1 is required.
            – Aleksei Matiushkin
            Nov 20 '18 at 11:31


















          • Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
            – Jeremy Belolo
            Nov 19 '18 at 15:46






          • 1




            1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
            – Aleksei Matiushkin
            Nov 19 '18 at 16:44










          • This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
            – Jeremy Belolo
            Nov 20 '18 at 7:52










          • Ah, indeed. Enum.uniq/1 is required.
            – Aleksei Matiushkin
            Nov 20 '18 at 11:31
















          Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
          – Jeremy Belolo
          Nov 19 '18 at 15:46




          Hey, thanks for helping. Moving to a map would remove the duplicate keys, wouldn't it ? Also, I don't want to test that returned keyword actually contains any :ok tuple, but rather that it doesn't contain something unexpected - other that :ok and :error tuples.
          – Jeremy Belolo
          Nov 19 '18 at 15:46




          1




          1




          1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
          – Aleksei Matiushkin
          Nov 19 '18 at 16:44




          1. yes, if you need duplicate keys, Keyword is the way to go. 2. Then simply assert Keyword.keys(result) -- ~w|ok error|a == .
          – Aleksei Matiushkin
          Nov 19 '18 at 16:44












          This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
          – Jeremy Belolo
          Nov 20 '18 at 7:52




          This won't work - as per doc def "Removes the first occurrence of an item on the left list for each item on the right" - only the first ! To remove all occurences of :ok and :error it won't work. Converting to a MapSet would remove some elements... But then, I could convert to a map and bind to a new variable in order to check only expected elements' keys are here, without relying on this new variable for anything else :) Thanks again
          – Jeremy Belolo
          Nov 20 '18 at 7:52












          Ah, indeed. Enum.uniq/1 is required.
          – Aleksei Matiushkin
          Nov 20 '18 at 11:31




          Ah, indeed. Enum.uniq/1 is required.
          – Aleksei Matiushkin
          Nov 20 '18 at 11:31


















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