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diff --git a/archive/1.vm/090scenario_filesystem_test.mu b/archive/1.vm/090scenario_filesystem_test.mu
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+# Check our support for fake file systems in scenarios.
+
+scenario read-from-fake-file [
+  local-scope
+  assume-resources [
+    [a] <- [
+      |xyz|
+    ]
+  ]
+  contents:&:source:char <- start-reading resources, [a]
+  1:char/raw <- read contents
+  2:char/raw <- read contents
+  3:char/raw <- read contents
+  4:char/raw <- read contents
+  _, 5:bool/raw <- read contents
+  memory-should-contain [
+    1 <- 120  # x
+    2 <- 121  # y
+    3 <- 122  # z
+    4 <- 10  # newline
+    5 <- 1  # eof
+  ]
+]
+
+scenario write-to-new-fake-file [
+  local-scope
+  assume-resources [
+  ]
+  sink:&:sink:char, writer:num/routine <- start-writing resources, [a]
+  sink <- write sink, 120/x
+  sink <- write sink, 121/y
+  close sink
+  wait-for-routine writer
+  contents-read-back:text <- slurp resources, [a]
+  10:bool/raw <- equal contents-read-back, [xy]
+  memory-should-contain [
+    10 <- 1  # file contents read back exactly match what was written
+  ]
+]
+
+scenario write-to-new-fake-file-2 [
+  local-scope
+  assume-resources [
+    [a] <- [
+      |abc|
+    ]
+  ]
+  sink:&:sink:char, writer:num/routine <- start-writing resources, [b]
+  sink <- write sink, 120/x
+  sink <- write sink, 121/y
+  close sink
+  wait-for-routine writer
+  contents-read-back:text <- slurp resources, [b]
+  10:bool/raw <- equal contents-read-back, [xy]
+  memory-should-contain [
+    10 <- 1  # file contents read back exactly match what was written
+  ]
+]
+
+scenario write-to-fake-file-that-exists [
+  local-scope
+  assume-resources [
+    [a] <- []
+  ]
+  sink:&:sink:char, writer:num/routine <- start-writing resources, [a]
+  sink <- write sink, 120/x
+  sink <- write sink, 121/y
+  close sink
+  wait-for-routine writer
+  contents-read-back:text <- slurp resources, [a]
+  10:bool/raw <- equal contents-read-back, [xy]
+  memory-should-contain [
+    10 <- 1  # file contents read back exactly match what was written
+  ]
+]
+
+scenario write-to-existing-file-preserves-other-files [
+  local-scope
+  assume-resources [
+    [a] <- []
+    [b] <- [
+      |bcd|
+    ]
+  ]
+  sink:&:sink:char, writer:num/routine <- start-writing resources, [a]
+  sink <- write sink, 120/x
+  sink <- write sink, 121/y
+  close sink
+  wait-for-routine writer
+  contents-read-back:text <- slurp resources, [a]
+  10:bool/raw <- equal contents-read-back, [xy]
+  other-file-contents:text <- slurp resources, [b]
+  11:bool/raw <- equal other-file-contents, [bcd
+]
+  memory-should-contain [
+    10 <- 1  # file contents read back exactly match what was written
+    11 <- 1  # other files also continue to persist unchanged
+  ]
+]