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ENGRAM Protocol — ISWA Bridge Tests
Tests for multi-architecture metadata detection and ISWA cache extraction.
Does NOT require a real GGUF model — tests the metadata helpers and spec logic.
"""
from __future__ import annotations
import pytest
from integrations.llama_cpp_bridge import _meta_get
from kvcos.core.cache_spec import (
GEMMA_4_26B_A4B,
LLAMA_3_1_8B,
get_model_spec,
is_iswa_spec,
)
class TestMetaGet:
"""Metadata key fallback chain across architecture prefixes."""
def test_llama_prefix(self) -> None:
meta = {"llama.block_count": "32"}
assert _meta_get(meta, "block_count") == "32"
def test_gemma4_prefix(self) -> None:
meta = {"gemma4.block_count": "30"}
assert _meta_get(meta, "block_count") == "30"
def test_gemma_prefix(self) -> None:
meta = {"gemma.attention.head_count": "8"}
assert _meta_get(meta, "attention.head_count") == "8"
def test_general_fallback(self) -> None:
meta = {"general.block_count": "28"}
assert _meta_get(meta, "block_count") == "28"
def test_default_when_missing(self) -> None:
meta = {}
assert _meta_get(meta, "block_count", "32") == "32"
def test_llama_takes_priority(self) -> None:
meta = {
"llama.block_count": "32",
"gemma4.block_count": "30",
"general.block_count": "28",
}
assert _meta_get(meta, "block_count") == "32"
def test_gemma4_before_general(self) -> None:
meta = {
"gemma4.embedding_length": "3072",
"general.embedding_length": "4096",
}
assert _meta_get(meta, "embedding_length") == "3072"
class TestISWASpecDetection:
"""Registry and ISWA detection."""
def test_gemma4_in_registry(self) -> None:
spec = get_model_spec("google/gemma-4-26b-a4b-it")
assert spec is not None
assert spec["model_family"] == "gemma"
def test_gemma4_is_iswa(self) -> None:
assert is_iswa_spec(GEMMA_4_26B_A4B) is True
def test_llama_not_iswa(self) -> None:
assert is_iswa_spec(LLAMA_3_1_8B) is False
def test_gemma4_sections_correct(self) -> None:
sections = GEMMA_4_26B_A4B["cache_sections"]
assert len(sections) == 2
# Global section
assert sections[0].n_layers == 5
assert sections[0].n_kv_heads == 2
assert sections[0].head_dim == 512
assert sections[0].n_embd_kv == 1024
# SWA section
assert sections[1].n_layers == 25
assert sections[1].n_kv_heads == 8
assert sections[1].head_dim == 256
assert sections[1].window_size == 1024
def test_gemma4_total_layers(self) -> None:
sections = GEMMA_4_26B_A4B["cache_sections"]
total = sum(s.n_layers for s in sections)
assert total == GEMMA_4_26B_A4B["n_layers"]
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