diff --git a/tests/test_cli_main.py b/tests/test_cli_main.py
new file mode 100644
index 0000000..63d9ddd
--- /dev/null
+++ b/tests/test_cli_main.py
@@ -0,0 +1,9 @@
+import importlib
+
+
+def test_import_cli_main():
+    mod = importlib.import_module("llm_observability_analytics.cli.main")
+    assert mod is not None
+
+
+# TODO: add tests for --help, --dry-run and config loading using tmp_path
diff --git a/tests/test_contracts_entities.py b/tests/test_contracts_entities.py
new file mode 100644
index 0000000..d9f6bba
--- /dev/null
+++ b/tests/test_contracts_entities.py
@@ -0,0 +1,9 @@
+import importlib
+
+
+def test_import_contracts_entities():
+    mod = importlib.import_module("llm_observability_analytics.contracts.entities")
+    assert mod is not None
+
+
+# TODO: add roundtrip dataclass tests using sample data
diff --git a/tests/test_events_interfaces.py b/tests/test_events_interfaces.py
new file mode 100644
index 0000000..ce1e1e4
--- /dev/null
+++ b/tests/test_events_interfaces.py
@@ -0,0 +1,9 @@
+import importlib
+
+
+def test_import_events_interfaces():
+    mod = importlib.import_module("llm_observability_analytics.events.interfaces")
+    assert mod is not None
+
+
+# TODO: add tests that implement a dummy loader to validate interface behavior
diff --git a/tests/test_events_loader.py b/tests/test_events_loader.py
new file mode 100644
index 0000000..cbd889a
--- /dev/null
+++ b/tests/test_events_loader.py
@@ -0,0 +1,108 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from pathlib import Path
+
+import pytest
+
+from llm_observability_analytics.contracts.models import (
+    LLMInteractionEvent,
+    ModelExecutionContext,
+    TokenUsageRecord,
+    LatencyRecord,
+    SourceGroundingReference,
+    RetrievalTraceEvent,
+)
+from llm_observability_analytics.events.loader import (
+    load_interaction_events,
+    load_retrieval_trace_events,
+)
+
+
+def _now_iso() -> str:
+    return datetime.now(tz=timezone.utc).isoformat()
+
+
+def _make_interaction(query_id: str, trace_id: str) -> LLMInteractionEvent:
+    mc = ModelExecutionContext(
+        query_id=query_id,
+        trace_id=trace_id,
+        model_version="m-v",
+        dataset_version=None,
+        provider="prov",
+        model_name="name",
+    )
+    tu = TokenUsageRecord(
+        query_id=query_id,
+        trace_id=trace_id,
+        model_version="m-v",
+        dataset_version=None,
+        input_tokens=1,
+        output_tokens=2,
+        recorded_at=datetime.now(timezone.utc),
+    )
+    lat = LatencyRecord(
+        query_id=query_id,
+        trace_id=trace_id,
+        request_timestamp=datetime.now(timezone.utc),
+        response_timestamp=datetime.now(timezone.utc),
+        latency_ms=123,
+    )
+    ref = SourceGroundingReference(
+        query_id=query_id, trace_id=trace_id, document_id="doc1", chunk_id="chk1"
+    )
+    return LLMInteractionEvent(
+        query_id=query_id,
+        trace_id=trace_id,
+        request_timestamp=datetime.now(timezone.utc),
+        response_timestamp=datetime.now(timezone.utc),
+        prompt_text="p",
+        response_text="r",
+        model_context=mc,
+        token_usage=tu,
+        latency=lat,
+        retrieval_references=[ref],
+    )
+
+
+def _make_retrieval(query_id: str, trace_id: str) -> RetrievalTraceEvent:
+    ref = SourceGroundingReference(
+        query_id=query_id, trace_id=trace_id, document_id="doc1", chunk_id="chk1"
+    )
+    return RetrievalTraceEvent(
+        query_id=query_id,
+        trace_id=trace_id,
+        retrieval_timestamp=datetime.now(timezone.utc),
+        query_text="hello",
+        retrieval_system="r",
+        top_k=1,
+        references=[ref],
+    )
+
+
+def test_load_interaction_events_success(tmp_path: Path) -> None:
+    p = tmp_path / "interactions.jsonl"
+    evt = _make_interaction("q1", "t1")
+    p.write_text(evt.to_json() + "\n", encoding="utf-8")
+
+    out = load_interaction_events(p, max_events=10)
+    assert len(out) == 1
+    assert out[0].query_id == "q1"
+
+
+def test_load_retrieval_trace_events_success(tmp_path: Path) -> None:
+    p = tmp_path / "retrieval.jsonl"
+    evt = _make_retrieval("q2", "t2")
+    p.write_text(evt.to_json() + "\n", encoding="utf-8")
+
+    out = load_retrieval_trace_events(p, max_events=10)
+    assert len(out) == 1
+    assert out[0].query_id == "q2"
+
+
+def test_load_invalid_json_raises(tmp_path: Path) -> None:
+    p = tmp_path / "broken.jsonl"
+    p.write_text("{not-json}\n", encoding="utf-8")
+    with pytest.raises(ValueError):
+        load_interaction_events(p, max_events=10)
+