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correx/testing/approvals/src/test/kotlin/TierImmutabilityTest.kt
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Kotlin

import com.correx.core.approvals.Tier
import com.correx.core.approvals.domain.DefaultApprovalEngine
import com.correx.core.approvals.model.ApprovalContext
import com.correx.core.approvals.model.ApprovalGrant
import com.correx.core.approvals.model.ApprovalScopeIdentity
import com.correx.core.approvals.GrantScope
import com.correx.core.sessions.ApprovalMode
import com.correx.core.events.types.GrantId
import com.correx.core.events.types.SessionId
import com.correx.testing.fixtures.request
import kotlinx.datetime.Instant
import org.junit.jupiter.api.Assertions
import org.junit.jupiter.api.Test
class TierImmutabilityTest {
private val engine = DefaultApprovalEngine()
@Test
fun `engine never modifies tier - always returns original`() {
val tiers = listOf(Tier.T0, Tier.T1, Tier.T2, Tier.T3, Tier.T4)
val ctx = ApprovalContext(
ApprovalScopeIdentity(SessionId("s1"), null, null),
ApprovalMode.YOLO
)
val now = Instant.parse("2026-01-01T00:00:01Z")
tiers.forEach { tier ->
val req = request("r1", tier)
val decision = engine.evaluate(req, ctx, emptyList(), now)
Assertions.assertEquals(tier, decision.tier, "Tier must remain unchanged")
}
}
@Test
fun `grant does not change tier in decision`() {
val tier = Tier.T3
val req = request("r1", tier)
val grant = ApprovalGrant(
id = GrantId("g1"),
scope = GrantScope.SESSION,
permittedTiers = setOf(tier),
reason = "test",
timestamp = Instant.parse("2026-01-01T00:00:00Z")
)
val ctx = ApprovalContext(
ApprovalScopeIdentity(SessionId("s1"), null, null),
ApprovalMode.DENY
)
val now = Instant.parse("2026-01-01T00:00:01Z")
val decision = engine.evaluate(req, ctx, listOf(grant), now)
Assertions.assertEquals(tier, decision.tier)
}
}