import CodexBarCoreimport Foundationimport Testing struct CodexPlanFormattingTests {    @Test    func `maps Codex pro plans to usage multiplier names`() {        #expect(CodexPlanFormatting.displayName("pro") == "Pro 20x")        #expect(CodexPlanFormatting.displayName("Pro") == "Pro 20x")        #expect(CodexPlanFormatting.displayName("Codex Pro") == "Pro 20x")        #expect(CodexPlanFormatting.displayName("prolite") == "Pro 5x")        #expect(CodexPlanFormatting.displayName("pro_lite") == "Pro 5x")        #expect(CodexPlanFormatting.displayName("pro-lite") == "Pro 5x")        #expect(CodexPlanFormatting.displayName("Pro Lite") == "Pro 5x")        #expect(CodexPlanFormatting.displayName("Codex Pro Lite") == "Pro 5x")    }     @Test    func `returns nil for empty plan values`() {        #expect(CodexPlanFormatting.displayName(nil) == nil)        #expect(CodexPlanFormatting.displayName("") == nil)        #expect(CodexPlanFormatting.displayName("   ") == nil)    }     @Test    func `humanizes machine style plan identifiers`() {        #expect(            CodexPlanFormatting.displayName("enterprise_cbp_usage_based")                == "Enterprise CBP Usage Based")        #expect(            CodexPlanFormatting.displayName("self_serve_business_usage_based")                == "Self Serve Business Usage Based")        #expect(CodexPlanFormatting.displayName("k12") == "K12")    }     @Test    func `preserves unrelated already readable plan text`() {        #expect(CodexPlanFormatting.displayName("Enterprise") == "Enterprise")    }}