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Add LRUCache test for get() recency promotion. #1898

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Add LRUCache test for get() recency promotion. #1898

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17 changes: 17 additions & 0 deletions Tests/SocketForwarderTests/LRUCacheTest.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -51,4 +51,21 @@ struct LRUCacheTest {
#expect(cache.get("qux") == "5")
#expect(cache.get("quux") == "6")
}

@Test
func testGetPromotesToMostRecentlyUsed() throws {
let cache = LRUCache<String, String>(size: 3)
#expect(cache.put(key: "foo", value: "1") == nil)
#expect(cache.put(key: "bar", value: "2") == nil)
#expect(cache.put(key: "baz", value: "3") == nil)

// Reading "foo" must promote it to most-recently-used, so the oldest
// remaining entry ("bar") is evicted next, not "foo".
#expect(cache.get("foo") == "1")

let evicted = try #require(cache.put(key: "qux", value: "4"))
#expect(evicted == ("bar", "2"))
#expect(cache.get("foo") == "1")
#expect(cache.get("bar") == nil)
}
}