https://elm-program-test.netlify.app/assets/js/8.f5193335.js

1(window.webpackJsonp=window.webpackJsonp||[]).push([[8],{399:function(t,s,a){t.exports=a.p+"assets/img/GrammarCheckExample.35f1773e.svg"},410:function(t,s,a){"use strict";a.r(s);var e=a(56),r=Object(e.a)({},(function(){var t=this,s=t.$createElement,e=t._self._c||s;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"testing-programs-with-ports"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#testing-programs-with-ports"}},[t._v("#")]),t._v(" Testing programs with ports")]),t._v(" "),e("p",[t._v("This guide "),e("strong",[t._v("requires that you're already familiar with\n"),e("RouterLink",{attrs:{to:"/cmds.html"}},[t._v("testing programs that use Cmds")])],1),t._v(".\nSpecifically, you should understand how to set up your program for testing\nby creating a custom Effect type and implementing a "),e("code",[t._v("simulateEffects")]),t._v(" function.\nIf you aren't yet familiar with doing that, you should follow the\n"),e("RouterLink",{attrs:{to:"/cmds.html"}},[t._v('"testing programs that use Cmds" guide')]),t._v(" first and return to this guide afterwards.")],1),t._v(" "),e("h2",{attrs:{id:"introducing-the-example-program"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#introducing-the-example-program"}},[t._v("#")]),t._v(" Introducing the example program")]),t._v(" "),e("p",[t._v('The rest of this section will be working with an example program\nthat interacts with the fictional "GudWerdz" service for\nchecking the grammar and writing style of a text input.')]),t._v(" "),e("p",[t._v('The fictional "GudWerdz" service only provides a JavaScript SDK,\nso our app needs to interact with it using '),e("a",{attrs:{href:"https://guide.elm-lang.org/interop/ports.html",target:"_blank",rel:"noopener noreferrer"}},[t._v("ports"),e("OutboundLink")],1),t._v(".")]),t._v(" "),e("p",[e("img",{attrs:{src:a(399),alt:"architecture diagram described in the preceding paragraph"}})]),t._v(" "),e("h2",{attrs:{id:"goal-the-ideal-test"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#goal-the-ideal-test"}},[t._v("#")]),t._v(" Goal: the ideal test")]),t._v(" "),e("p",[t._v("The test we want to write represents the following scenario:")]),t._v(" "),e("ol",[e("li",[t._v("The user fills in the text area with some text.")]),t._v(" "),e("li",[t._v('The user clicks the "Check" button.')]),t._v(" "),e("li",[t._v("The app sends the text to check out through the "),e("code",[t._v("checkGrammar")]),t._v(" port, which will call the GudWerdz API.")]),t._v(" "),e("li",[t._v("The GudWerdz API returns a list of problems with the text, which get sent to the "),e("code",[t._v("checkGrammarResults")]),t._v(" port.")]),t._v(" "),e("li",[t._v("The app receives the results and displays them to the user.")])]),t._v(" "),e("p",[t._v("Here's what that test will look like in code:")]),t._v(" "),e("div",{staticClass:"language-elm extra-class"},[e("div",{staticClass:"highlight-lines"},[e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("br"),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("div",{staticClass:"highlighted"},[t._v(" ")]),e("br"),e("br"),e("br")]),e("pre",{pre:!0,attrs:{class:"language-elm"}},[e("code",[e("span",{pre:!0,attrs:{class:"token import-statement"}},[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" Expect")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token import-statement"}},[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" Json.Decode")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token import-statement"}},[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" Json.Encode")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token import-statement"}},[e("span",{pre:!0,attrs:{class:"token keyword"}}

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1")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token hvariable"}},[t._v("ProgramTest.simulateIncomingPort")]),t._v("\n                "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"grammarCheckResults"')]),t._v("\n                "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),e("span",{pre:!0,attrs:{class:"token hvariable"}},[t._v("Json.Encode.list")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token hvariable"}},[t._v("Json.Encode.string")]),t._v("\n                    "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token string"}},[t._v('"Garden-path sentences can confuse the reader."')]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v("\n                "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n            "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("|>")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token 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"),e("h2",{attrs:{id:"simulating-outgoing-ports"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#simulating-outgoing-ports"}},[t._v("#")]),t._v(" Simulating outgoing ports")]),t._v(" "),e("p",[t._v("We'll assume that we already have our test set up with "),e("code",[t._v("ProgramTest.withSimulatedEffects")]),t._v("\n(if you're not familiar with that,\nyou should first follow the "),e("RouterLink",{attrs:{to:"/cmds.html"}},[t._v('"testing programs that use Cmds" guide')]),t._v(").")],1),t._v(" "),e("p",[t._v("To add simulation of our port effect, we'll make use of "),e("code",[t._v("SimulatedEffect.Ports.send")]),t._v("\nin our "),e("code",[t._v("simulateEffects")]),t._v(" function:")]),t._v(" "),e("div",{staticClass:"language-elm extra-class"},[e("pre",{pre:!0,attrs:{class:"language-elm"}},[e("code",[e("span",{pre:!0,attrs:{class:"token import-statement"}},[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("import")]),t._v(" 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