Initial commit

README.md

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+# Food Chain
+
+Write a program that generates the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'
+
+Write a program that generates the lyrics to the song
+"I know an old lady who swallowed a fly". While you could
+copy/paste the lyrics, or read them from a file, this
+problem is much more interesting if you approach it
+algorithmically.
+
+This is a [cumulative song](http://en.wikipedia.org/wiki/Cumulative_song) of unknown origin.
+
+This is one of many common variants.
+
+```plain
+I know an old lady who swallowed a fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a spider.
+It wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a bird.
+How absurd to swallow a bird!
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a cat.
+Imagine that, to swallow a cat!
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a dog.
+What a hog, to swallow a dog!
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a goat.
+Just opened her throat and swallowed a goat!
+She swallowed the goat to catch the dog.
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a cow.
+I don't know how she swallowed a cow!
+She swallowed the cow to catch the goat.
+She swallowed the goat to catch the dog.
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.
+
+I know an old lady who swallowed a horse.
+She's dead, of course!
+```
+
+To run the tests simply run the command `go test` in the exercise directory.
+
+If the test suite contains benchmarks, you can run these with the `-bench`
+flag:
+
+    go test -bench .
+
+For more detailed info about the Go track see the [help
+page](http://exercism.io/languages/go).
+
+## Source
+
+Wikipedia [view source](http://en.wikipedia.org/wiki/There_Was_an_Old_Lady_Who_Swallowed_a_Fly)

food_chain.go

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+package foodchain
+
+const testVersion = 2

food_chain_test.go

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+package foodchain
+
+import (
+	"strings"
+	"testing"
+)
+
+const targetTestVersion = 2
+
+func TestTestVersion(t *testing.T) {
+	if testVersion != targetTestVersion {
+		t.Errorf("Found testVersion = %v, want %v.", testVersion, targetTestVersion)
+	}
+}
+
+var ref = []string{``,
+
+	`I know an old lady who swallowed a fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a spider.
+It wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a bird.
+How absurd to swallow a bird!
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a cat.
+Imagine that, to swallow a cat!
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a dog.
+What a hog, to swallow a dog!
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a goat.
+Just opened her throat and swallowed a goat!
+She swallowed the goat to catch the dog.
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a cow.
+I don't know how she swallowed a cow!
+She swallowed the cow to catch the goat.
+She swallowed the goat to catch the dog.
+She swallowed the dog to catch the cat.
+She swallowed the cat to catch the bird.
+She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.
+She swallowed the spider to catch the fly.
+I don't know why she swallowed the fly. Perhaps she'll die.`,
+
+	`I know an old lady who swallowed a horse.
+She's dead, of course!`,
+}
+
+func TestVerse(t *testing.T) {
+	for v := 1; v <= 8; v++ {
+		if ret := Verse(v); ret != ref[v] {
+			t.Fatalf("Verse(%d) =\n%s\n  want:\n%s", v, ret, ref[v])
+		}
+	}
+}
+
+func TestVerses(t *testing.T) {
+	if ret, want := Verses(1, 2), ref[1]+"\n\n"+ref[2]; ret != want {
+		t.Fatalf("Verses(1, 2) =\n%s\n  want:\n%s", ret, want)
+	}
+
+}
+
+func TestSong(t *testing.T) {
+	if ret, want := Song(), strings.Join(ref[1:], "\n\n"); ret != want {
+		t.Fatalf("Song() =\n%s\n  want:\n%s", ret, want)
+	}
+}
+
+func BenchmarkSong(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Song()
+	}
+}