test(engine-specific): ✅ Add unit tests for species generation logic, including edge cases and validation assertions
Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>
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Claude Code
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engine/tests/unit/test_species_generation.gd
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engine/tests/unit/test_species_generation.gd
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extends GutTest
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## M2b Block 1 verification — species generation diversity and constraint validation.
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## Tests 1.5 (diversity) and 1.6 (constraint validation) from the M2b task list.
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const SpeciesGeneratorScript = preload("res://engine/src/models/world/species_generator.gd")
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const TraitSetScript = preload("res://engine/src/models/world/species_traits.gd")
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const ALL_BIOMES: Array = [
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"deep_ocean", "shallow_ocean", "coral_reef", "estuary", "lake", "pond",
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"river", "mangrove", "tropical_rainforest", "tropical_dry_forest",
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"savanna", "desert", "temperate_forest", "temperate_grassland",
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"chaparral", "swamp", "bog", "boreal_forest", "tundra", "polar_desert",
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"montane_forest", "cloud_forest", "alpine_meadow", "alpine_tundra",
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"permanent_ice", "subterranean",
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]
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const TEST_SEEDS: Array = [42, 137, 256, 404, 512, 777, 999, 1234, 2048, 3141]
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const MIN_PRODUCERS: int = 3
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const MIN_HERBIVORES: int = 3
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const MIN_PREDATORS: int = 2
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func before_all() -> void:
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DataLoader.load_theme("age-of-four")
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## 1.5: Each biome generates at least 3 producers + 3 herbivores + 2 predators
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## across 10 seeds.
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func test_species_diversity_per_biome() -> void:
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var report: Array[String] = []
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var failures: Array[String] = []
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for biome_id: String in ALL_BIOMES:
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var weights: Dictionary = DataLoader.get_biome_trait_weights(biome_id)
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var total_producers: int = 0
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var total_herbivores: int = 0
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var total_predators: int = 0
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var total_species: int = 0
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for seed_val: int in TEST_SEEDS:
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var species: Array = SpeciesGeneratorScript.generate(
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biome_id, 3, seed_val, weights
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)
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total_species += species.size()
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for ts: Variant in species:
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match ts.diet:
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"producer":
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total_producers += 1
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"herbivore":
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total_herbivores += 1
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"carnivore", "omnivore":
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total_predators += 1
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var line: String = (
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"%s: %d species, %d producers, %d herbivores, %d predators"
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% [biome_id, total_species, total_producers, total_herbivores, total_predators]
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)
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report.append(line)
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if total_producers < MIN_PRODUCERS:
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failures.append("%s: only %d producers (need %d)" % [biome_id, total_producers, MIN_PRODUCERS])
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if total_herbivores < MIN_HERBIVORES:
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failures.append("%s: only %d herbivores (need %d)" % [biome_id, total_herbivores, MIN_HERBIVORES])
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if total_predators < MIN_PREDATORS:
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failures.append("%s: only %d predators (need %d)" % [biome_id, total_predators, MIN_PREDATORS])
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# Print diversity report
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gut.p("=== Species Diversity Report (10 seeds, quality 3) ===")
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for line: String in report:
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gut.p(line)
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if failures.size() > 0:
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gut.p("=== FAILURES ===")
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for f: String in failures:
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gut.p(f)
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fail_test("Diversity check failed for %d biomes" % failures.size())
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else:
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pass_test("All biomes meet diversity minimums")
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## 1.6: Zero invalid species generated across all biomes on 10 seeds.
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func test_zero_invalid_species() -> void:
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var invalid_count: int = 0
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var total_count: int = 0
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for biome_id: String in ALL_BIOMES:
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var weights: Dictionary = DataLoader.get_biome_trait_weights(biome_id)
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for seed_val: int in TEST_SEEDS:
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var species: Array = SpeciesGeneratorScript.generate(
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biome_id, 3, seed_val, weights
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)
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for ts: Variant in species:
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total_count += 1
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if not ts.validate():
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invalid_count += 1
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gut.p(
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"INVALID: %s in %s (seed %d)" % [ts.trait_hash, biome_id, seed_val]
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)
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gut.p("Total species generated: %d, invalid: %d" % [total_count, invalid_count])
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assert_eq(invalid_count, 0, "All generated species must pass validate()")
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## Verify amphibious adjacency boost produces amphibious species.
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func test_amphibious_adjacency_boost() -> void:
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var weights: Dictionary = DataLoader.get_biome_trait_weights("temperate_forest")
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var amphibious_without: int = 0
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var amphibious_with: int = 0
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var trials: int = 10
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for seed_val: int in TEST_SEEDS:
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var normal: Array = SpeciesGeneratorScript.generate(
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"temperate_forest", 3, seed_val, weights, false
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)
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var boosted: Array = SpeciesGeneratorScript.generate(
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"temperate_forest", 3, seed_val, weights, true
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)
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for ts: Variant in normal:
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if ts.habitat == "amphibious":
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amphibious_without += 1
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for ts: Variant in boosted:
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if ts.habitat == "amphibious":
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amphibious_with += 1
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gut.p(
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"Amphibious species: without boost=%d, with boost=%d (across %d seeds)"
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% [amphibious_without, amphibious_with, trials]
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)
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assert_true(
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amphibious_with >= amphibious_without,
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"Adjacency boost should not reduce amphibious species count"
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)
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## Verify migration pattern detection.
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func test_migration_pattern_detection() -> void:
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var flying_herd := TraitSetScript.new()
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flying_herd.size = "medium"
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flying_herd.diet = "herbivore"
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flying_herd.habitat = "aerial"
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flying_herd.locomotion = "flying"
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flying_herd.reproduction = "k_strategy"
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flying_herd.thermal = "warm_blooded"
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flying_herd.social = "herd"
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assert_eq(
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SpeciesGeneratorScript.get_migration_pattern(flying_herd),
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"seasonal",
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"Aerial herd should get seasonal migration"
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)
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var walking_pack := TraitSetScript.new()
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walking_pack.size = "medium"
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walking_pack.diet = "carnivore"
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walking_pack.habitat = "terrestrial"
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walking_pack.locomotion = "walking"
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walking_pack.reproduction = "k_strategy"
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walking_pack.thermal = "warm_blooded"
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walking_pack.social = "pack"
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assert_eq(
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SpeciesGeneratorScript.get_migration_pattern(walking_pack),
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null,
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"Walking pack should not get seasonal migration"
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)
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var flying_swarm := TraitSetScript.new()
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flying_swarm.size = "tiny"
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flying_swarm.diet = "herbivore"
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flying_swarm.habitat = "terrestrial"
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flying_swarm.locomotion = "flying"
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flying_swarm.reproduction = "r_strategy"
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flying_swarm.thermal = "cold_blooded"
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flying_swarm.social = "swarm"
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assert_eq(
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SpeciesGeneratorScript.get_migration_pattern(flying_swarm),
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"seasonal",
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"Flying swarm should get seasonal migration"
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)
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