50 lines
2.2 KiB
Swift
50 lines
2.2 KiB
Swift
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import XCTest
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@testable import NetworkCityCore
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final class ExpansionPolicyTests: XCTestCase {
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typealias D = ExpansionPolicy.District
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func testBusyMultiEndpointOrgExpands() {
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let policy = ExpansionPolicy()
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let expanded = policy.update([D(key: "onedrive", bytes: 500_000, endpointCount: 15)])
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XCTAssertTrue(expanded.contains("onedrive"))
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}
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func testSingleEndpointNeverExpandsEvenIfHuge() {
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// The exact case we saw live: Google at 126 MB but only one active IP.
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let policy = ExpansionPolicy()
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let expanded = policy.update([D(key: "google", bytes: 126_000_000, endpointCount: 1)])
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XCTAssertTrue(expanded.isEmpty)
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}
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func testQuietOrgDoesNotExpand() {
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let policy = ExpansionPolicy(floorBytes: 8 * 1024)
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let expanded = policy.update([D(key: "apple", bytes: 100, endpointCount: 5)])
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XCTAssertTrue(expanded.isEmpty)
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}
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func testOnlyTopKExpand() {
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let policy = ExpansionPolicy(topK: 2)
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let districts = (0..<5).map { D(key: "org\($0)", bytes: UInt64(1000 - $0) * 1024, endpointCount: 3) }
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let expanded = policy.update(districts)
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XCTAssertEqual(expanded, ["org0", "org1"]) // two busiest only
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}
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func testHysteresisKeepsExpandedThenCollapses() {
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let policy = ExpansionPolicy(ttlTicks: 3)
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// Tick 1: busy -> expands.
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XCTAssertTrue(policy.update([D(key: "x", bytes: 1_000_000, endpointCount: 4)]).contains("x"))
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// Now idle, but still has endpoints: stays up for the TTL tail.
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XCTAssertTrue(policy.update([D(key: "x", bytes: 0, endpointCount: 4)]).contains("x")) // ttl 2
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XCTAssertTrue(policy.update([D(key: "x", bytes: 0, endpointCount: 4)]).contains("x")) // ttl 1
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XCTAssertFalse(policy.update([D(key: "x", bytes: 0, endpointCount: 4)]).contains("x")) // ttl 0 -> collapsed
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}
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func testExpiredTimerWithLostEndpointsStaysCollapsed() {
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let policy = ExpansionPolicy(ttlTicks: 2)
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_ = policy.update([D(key: "x", bytes: 1_000_000, endpointCount: 4)])
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// Endpoints drop to 1 while timer still alive -> nothing to fan out.
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XCTAssertFalse(policy.update([D(key: "x", bytes: 0, endpointCount: 1)]).contains("x"))
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}
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}
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