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Test: Plan configuration lookup failures and fallback rules #6

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128 changes: 128 additions & 0 deletions src/test/java/com/tabs/utility/PlanConfigTest.java
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package com.tabs.utility;

import com.tabs.models.Plan;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class PlanConfigTest {

@Test
void getPlanById_returnsSystemPlanForKnownId() {
Plan plan = PlanConfig.getPlanById("UNIV-01");

assertNotNull(plan);
assertSame(PlanConfig.SYSTEM_PLAN, plan);
assertEquals("UNIV-01", plan.getPlanId());
assertEquals("Universal Plan 799", plan.getPlanName());
assertEquals(799.0, plan.getMonthlyRental());
assertEquals(100.0, plan.getVoiceAllowedMins());
assertEquals(5000.0, plan.getDataAllowanceGB());
assertEquals(100, plan.getSmsAllowed());
assertEquals(9.0, plan.getVoiceOverageRatePerMin());
assertEquals(0.9, plan.getDataOverageRatePerGB());
assertEquals(0.5, plan.getSmsOveragePerSMS());
assertEquals(500.0, plan.getWeekendFreeMinutes());
assertTrue(plan.isFamilyShared());
}

@Test
void getPlanById_returnsLitePlanForKnownId() {
Plan plan = PlanConfig.getPlanById("LITE-01");

assertNotNull(plan);
assertSame(PlanConfig.SYSTEM_PLAN_LITE, plan);
assertEquals("LITE-01", plan.getPlanId());
assertEquals("Lite Plan 599", plan.getPlanName());
assertEquals(599.0, plan.getMonthlyRental());
assertEquals(70.0, plan.getVoiceAllowedMins());
assertEquals(3000.0, plan.getDataAllowanceGB());
assertEquals(50, plan.getSmsAllowed());
assertEquals(9.0, plan.getVoiceOverageRatePerMin());
assertEquals(0.9, plan.getDataOverageRatePerGB());
assertEquals(0.5, plan.getSmsOveragePerSMS());
assertEquals(500.0, plan.getWeekendFreeMinutes());
assertTrue(plan.isFamilyShared());
}

@Test
void getPlanById_isCaseSensitiveAndRejectsMalformedKeys() {
assertNull(PlanConfig.getPlanById("univ-01"));
assertNull(PlanConfig.getPlanById("UNIV-01 "));
assertNull(PlanConfig.getPlanById(" UNIV-01"));
assertNull(PlanConfig.getPlanById("UNIV_01"));
assertNull(PlanConfig.getPlanById(""));
assertNull(PlanConfig.getPlanById(" "));
assertNull(PlanConfig.getPlanById("LITE-1"));
assertNull(PlanConfig.getPlanById("LITE-01-extra"));
}

@Test
void getPlanById_returnsNullForMissingOrNullPlanId() {
assertNull(PlanConfig.getPlanById("MISSING-PLAN"));
assertNull(PlanConfig.getPlanById(null));
}

@Test
void systemPlansAreRegisteredAndRemainDistinct() {
assertNotNull(PlanConfig.SYSTEM_PLAN);
assertNotNull(PlanConfig.SYSTEM_PLAN_LITE);
assertNotSame(PlanConfig.SYSTEM_PLAN, PlanConfig.SYSTEM_PLAN_LITE);
assertEquals("UNIV-01", PlanConfig.SYSTEM_PLAN.getPlanId());
assertEquals("LITE-01", PlanConfig.SYSTEM_PLAN_LITE.getPlanId());
assertNotEquals(PlanConfig.SYSTEM_PLAN.getMonthlyRental(), PlanConfig.SYSTEM_PLAN_LITE.getMonthlyRental());
}

@Test
void planDefaultConstructorSetsFamilySharedFalseAndSettersExposeProperties() {
Plan plan = new Plan();

assertFalse(plan.isFamilyShared());
assertNull(plan.getPlanId());
assertNull(plan.getPlanName());
assertNull(plan.getMonthlyRental());
assertNull(plan.getDataAllowanceGB());
assertNull(plan.getVoiceAllowedMins());
assertNull(plan.getSmsAllowed());
assertNull(plan.getDataOverageRatePerGB());
assertNull(plan.getVoiceOverageRatePerMin());
assertNull(plan.getSmsOveragePerSMS());
assertNull(plan.getWeekendFreeMinutes());

plan.setPlanId("TEST-01");
plan.setPlanName("Test Plan");
plan.setMonthlyRental(123.45);
plan.setDataAllowanceGB(10.0);
plan.setVoiceAllowedMins(20.0);
plan.setSmsAllowed(30);
plan.setDataOverageRatePerGB(1.1);
plan.setVoiceOverageRatePerMin(2.2);
plan.setSmsOveragePerSMS(3.3);
plan.setWeekendFreeMinutes(40.0);
plan.setFamilyShared(true);

assertEquals("TEST-01", plan.getPlanId());
assertEquals("Test Plan", plan.getPlanName());
assertEquals(123.45, plan.getMonthlyRental());
assertEquals(10.0, plan.getDataAllowanceGB());
assertEquals(20.0, plan.getVoiceAllowedMins());
assertEquals(30, plan.getSmsAllowed());
assertEquals(1.1, plan.getDataOverageRatePerGB());
assertEquals(2.2, plan.getVoiceOverageRatePerMin());
assertEquals(3.3, plan.getSmsOveragePerSMS());
assertEquals(40.0, plan.getWeekendFreeMinutes());
assertTrue(plan.isFamilyShared());
}

@Test
void planConstantsHaveExpectedValues() {
assertEquals(0.18, PlanConfig.GST_RATE);
assertEquals(0.05, PlanConfig.REFERRAL_DISCOUNT_RATE);
assertEquals(0.5, PlanConfig.NIGHT_TIME_DATA_DISCOUNT_WEIGHT);
assertEquals(0.15, PlanConfig.DOMESTIC_ROAMING_SURCHARGE_RATE);
assertEquals(0.60, PlanConfig.FAMILY_FAIRNESS_USAGE_THRESHOLD);
assertEquals(250.0, PlanConfig.FAMILY_FAIRNESS_SURCHARGE);
assertEquals(0.50, PlanConfig.DATA_ROLLOVER_CAP_PERCENT);
assertEquals(60, PlanConfig.CREDIT_CONTROL_DAYS_THRESHOLD);
}
}