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<pre id='vimCodeElement'>
<span class="Comment"># Check our support for fake file systems in scenarios.</span>

<span class="muScenario">scenario</span> read-from-fake-file [
  <span class="Constant">local-scope</span>
  assume-filesystem [
    <span class="Constant">[a]</span><span class="Special"> &lt;- </span>[
<span class="Constant">      |xyz|</span>
    ]
  ]
  contents:address:source:character<span class="Special"> &lt;- </span>start-reading filesystem:address:filesystem, <span class="Constant">[a]</span>
  <span class="Constant">1</span>:character/<span class="Special">raw &lt;- </span>read contents
  <span class="Constant">2</span>:character/<span class="Special">raw &lt;- </span>read contents
  <span class="Constant">3</span>:character/<span class="Special">raw &lt;- </span>read contents
  <span class="Constant">4</span>:character/<span class="Special">raw &lt;- </span>read contents
  _, <span class="Constant">5</span>:boolean/<span class="Special">raw &lt;- </span>read contents
  memory-should-contain [
    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">120</span>  <span class="Comment"># x</span>
    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">121</span>  <span class="Comment"># y</span>
    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">122</span>  <span class="Comment"># z</span>
    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">10</span>  <span class="Comment"># newline</span>
    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># eof</span>
  ]
]

<span class="muScenario">scenario</span> write-to-fake-file [
  <span class="Constant">local-scope</span>
  assume-filesystem [
  ]
  sink:address:sink:character, writer:number/routine<span class="Special"> &lt;- </span>start-writing filesystem:address:filesystem, <span class="Constant">[a]</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">120/x</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:address:array:character<span class="Special"> &lt;- </span>slurp filesystem, <span class="Constant">[a]</span>
  <span class="Constant">10</span>:boolean/<span class="Special">raw &lt;- </span>equal contents-read-back, <span class="Constant">[xy]</span>
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
  ]
]

<span class="muScenario">scenario</span> write-to-fake-file-that-exists [
  <span class="Constant">local-scope</span>
  assume-filesystem [
    <span class="Constant">[a]</span><span class="Special"> &lt;- </span><span class="Constant">[]</span>
  ]
  sink:address:sink:character, writer:number/routine<span class="Special"> &lt;- </span>start-writing filesystem:address:filesystem, <span class="Constant">[a]</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">120/x</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:address:array:character<span class="Special"> &lt;- </span>slurp filesystem, <span class="Constant">[a]</span>
  <span class="Constant">10</span>:boolean/<span class="Special">raw &lt;- </span>equal contents-read-back, <span class="Constant">[xy]</span>
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
  ]
]

<span class="muScenario">scenario</span> write-to-existing-file-preserves-other-files [
  <span class="Constant">local-scope</span>
  assume-filesystem [
    <span class="Constant">[a]</span><span class="Special"> &lt;- </span><span class="Constant">[]</span>
    <span class="Constant">[b]</span><span class="Special"> &lt;- </span>[
<span class="Constant">      |bcd|</span>
    ]
  ]
  sink:address:sink:character, writer:number/routine<span class="Special"> &lt;- </span>start-writing filesystem:address:filesystem, <span class="Constant">[a]</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">120/x</span>
  sink<span class="Special"> &lt;- </span>write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:address:array:character<span class="Special"> &lt;- </span>slurp filesystem, <span class="Constant">[a]</span>
  <span class="Constant">10</span>:boolean/<span class="Special">raw &lt;- </span>equal contents-read-back, <span class="Constant">[xy]</span>
  other-file-contents:address:array:character<span class="Special"> &lt;- </span>slurp filesystem, <span class="Constant">[b]</span>
  <span class="Constant">11</span>:boolean/<span class="Special">raw &lt;- </span>equal other-file-contents, <span class="Constant">[bcd</span>
<span class="Constant">]</span>
  memory-should-contain [
    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># other files also continue to persist unchanged</span>
  ]
]

<span class="muRecipe">def</span> slurp fs:address:filesystem, filename:address:array:character<span class="muRecipe"> -&gt; </span>contents:address:array:character [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  source:address:source:character<span class="Special"> &lt;- </span>start-reading fs, filename
  buf:address:buffer<span class="Special"> &lt;- </span>new-buffer <span class="Constant">30/capacity</span>
  <span class="Delimiter">{</span>
    c:character, done?:boolean, source<span class="Special"> &lt;- </span>read source
    <span class="muControl">break-if</span> done?
    buf<span class="Special"> &lt;- </span>append buf, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  contents<span class="Special"> &lt;- </span>buffer-to-array buf
]
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