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Parameterized tests let you run the same test method multiple times with different arguments. Instead of duplicating test methods for each input, declare the values once and let HRTK iterate over them.

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Basic Usage

Annotate your method with @ParameterizedTest and provide values via @ValueSource. The first parameter of your method receives each value in turn. 
import com.frotty27.hrtk.api.annotation.ParameterizedTest;
import com.frotty27.hrtk.api.annotation.ValueSource;
import com.frotty27.hrtk.api.assert_.HytaleAssert;

@HytaleSuite("Tier Validation Tests")
public class TierTests {

    @ParameterizedTest
    @ValueSource(ints = {1, 2, 3, 4, 5})
    void tierShouldBePositive(int tier) {
        HytaleAssert.assertGreaterThan(0, tier);
    }
}
This generates five test executions, each reported separately in the output: 
    [PASS] tierShouldBePositive [0] 1 (1ms)
    [PASS] tierShouldBePositive [1] 2 (0ms)
    [PASS] tierShouldBePositive [2] 3 (0ms)
    [PASS] tierShouldBePositive [3] 4 (1ms)
    [PASS] tierShouldBePositive [4] 5 (0ms)

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Supported Value Types

@ValueSource supports six primitive array types. Set exactly one array field per annotation. 
@ParameterizedTest
@ValueSource(ints = {0, 1, 10, 100, Integer.MAX_VALUE})
void testIntValues(int value) {
    HytaleAssert.assertTrue(value >= 0);
}

@ParameterizedTest
@ValueSource(strings = {"wood_sword", "stone_sword", "iron_sword"})
void testItemIdFormat(String itemId) {
    HytaleAssert.assertMatches("[a-z_]+", itemId);
}

@ParameterizedTest
@ValueSource(doubles = {0.0, 0.5, 1.0, 99.9})
void testDamageMultiplier(double multiplier) {
    HytaleAssert.assertTrue(multiplier >= 0.0);
    HytaleAssert.assertTrue(multiplier <= 100.0);
}

@ParameterizedTest
@ValueSource(longs = {1L, 1000L, 1_000_000L})
void testTickCounts(long ticks) {
    HytaleAssert.assertGreaterThan(0L, ticks);
}

@ParameterizedTest
@ValueSource(floats = {0.1f, 0.5f, 1.0f})
void testHealthPercentages(float pct) {
    HytaleAssert.assertTrue(pct > 0f);
    HytaleAssert.assertTrue(pct <= 1f);
}

@ParameterizedTest
@ValueSource(booleans = {true, false})
void testToggleState(boolean enabled) {
    // Test logic that varies by boolean state
    HytaleAssert.assertNotNull(enabled);
}

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Combining with Context Injection

The parameterized value is always the first parameter. Additional parameters are injected by HRTK as usual. 
@ParameterizedTest
@ValueSource(strings = {"hytale:kweebec", "hytale:trork"})
void testEntitySpawnByType(String entityTypeId, WorldTestContext ctx) {
    Object entity = ctx.spawnEntity(entityTypeId, 0, 64, 0);
    HytaleAssert.assertNotNull("Entity should spawn: " + entityTypeId, entity);
    HytaleAssert.assertTrue(ctx.entityExists(entity));
}
The parameterized value must be the first parameter in the method signature. Context types (TestContext, WorldTestContext, etc.) must come after.

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How Results Are Reported

Each parameter value produces a separate TestResult with a display name that includes the index and value: 
testName [index] value
For example: 
    [PASS] testItemIdFormat [0] wood_sword (1ms)
    [PASS] testItemIdFormat [1] stone_sword (0ms)
    [FAIL] testItemIdFormat [2] iron_sword (1ms)
If --fail-fast is set and one parameterized invocation fails, the remaining values are skipped.

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Practical Example: Tier Damage Scaling

@HytaleSuite("Damage Scaling Tests")
@Tag("combat")
public class DamageScalingTests {

    @ParameterizedTest
    @ValueSource(ints = {1, 2, 3, 4, 5})
    void tierDamageShouldScale(int tier) {
        float expectedMinDamage = tier * 2.0f;
        float expectedMaxDamage = tier * 5.0f;

        float actualDamage = calculateDamageForTier(tier);

        HytaleAssert.assertTrue(
            String.format("Tier %d damage (%.1f) should be >= %.1f", tier, actualDamage, expectedMinDamage),
            actualDamage >= expectedMinDamage
        );
        HytaleAssert.assertTrue(
            String.format("Tier %d damage (%.1f) should be <= %.1f", tier, actualDamage, expectedMaxDamage),
            actualDamage <= expectedMaxDamage
        );
    }

    private float calculateDamageForTier(int tier) {
        return tier * 3.5f; // placeholder
    }
}

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Next Steps