diff --git a/.github/workflows/lint-and-test.yml b/.github/workflows/lint-and-test.yml
index d697eaa..734f605 100644
--- a/.github/workflows/lint-and-test.yml
+++ b/.github/workflows/lint-and-test.yml
@@ -15,6 +15,7 @@ jobs:
   lint-and-test:
     uses: esclient/tools/.github/workflows/lint-and-test-python.yml@v1.0.0
     with:
-      python-version: '3.13.7'
+      python-version: "3.13.7"
+      source: "commentservice"
     secrets:
       SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
diff --git a/Dockerfile b/Dockerfile
index 714c456..d23d1cb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:3.13-slim
 
-RUN apt-get update && apt-get install -y wget curl jq && \
+RUN apt-get update && apt-get install -y curl jq wget && \
     wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64 && \
     chmod +x /usr/local/bin/yq && \
     apt-get remove -y wget && apt-get autoremove -y && \
@@ -9,15 +9,14 @@ RUN apt-get update && apt-get install -y wget curl jq && \
 WORKDIR /app
 
 COPY pyproject.toml pdm.lock ./
+COPY . .
 RUN pip install --no-cache-dir pdm && \
     pdm export --without-hashes -f requirements > /tmp/req.txt && \
     pip install --no-cache-dir -r /tmp/req.txt && \
     pip uninstall -y pdm && \
-    rm /tmp/req.txt
-
-COPY . .
-RUN pip install --no-cache-dir -e .
-RUN chmod +x tools/load_envs.sh
+    rm /tmp/req.txt && \
+    pip install --no-cache-dir -e . && \
+    chmod +x tools/load_envs.sh
 
 ENV ENV=prod
 ENV PYTHONPATH=src
diff --git a/justfile b/justfile
index 9de3706..59ae2d8 100644
--- a/justfile
+++ b/justfile
@@ -7,7 +7,8 @@ LOAD_ENVS_URL := 'https://raw.githubusercontent.com/esclient/tools/refs/heads/ma
 PROTO_TAG := 'v0.0.17'
 PROTO_NAME := 'comment.proto'
 TMP_DIR := '.proto'
-OUT_DIR := 'src/commentservice/grpc'
+SOURCE := 'commentservice'
+OUT_DIR := 'src/' + SOURCE + '/grpc'
 
 MKDIR_TOOLS := 'mkdir -p tools'
 
diff --git a/pdm.lock b/pdm.lock
index 301df39..1abebf0 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -5,7 +5,7 @@
 groups = ["default", "dev"]
 strategy = ["inherit_metadata"]
 lock_version = "4.5.0"
-content_hash = "sha256:d5bab202f6faef35a9f10ac6d61606aec20f4d5b719540d89425540741c7130c"
+content_hash = "sha256:e3b96de7c4efceb61703b10262da72cbc0a735cbb324a8fe866247d8c513a297"
 
 [[metadata.targets]]
 requires_python = "~=3.13"
@@ -26,9 +26,9 @@ files = [
 
 [[package]]
 name = "anyio"
-version = "4.9.0"
+version = "4.11.0"
 requires_python = ">=3.9"
-summary = "High level compatibility layer for multiple asynchronous event loop implementations"
+summary = "High-level concurrency and networking framework on top of asyncio or Trio"
 groups = ["default"]
 dependencies = [
     "exceptiongroup>=1.0.2; python_version < \"3.11\"",
@@ -37,8 +37,8 @@ dependencies = [
     "typing-extensions>=4.5; python_version < \"3.13\"",
 ]
 files = [
-    {file = "anyio-4.9.0-py3-none-any.whl", hash = "sha256:9f76d541cad6e36af7beb62e978876f3b41e3e04f2c1fbf0884604c0a9c4d93c"},
-    {file = "anyio-4.9.0.tar.gz", hash = "sha256:673c0c244e15788651a4ff38710fea9675823028a6f08a5eda409e0c9840a028"},
+    {file = "anyio-4.11.0-py3-none-any.whl", hash = "sha256:0287e96f4d26d4149305414d4e3bc32f0dcd0862365a4bddea19d7a1ec38c4fc"},
+    {file = "anyio-4.11.0.tar.gz", hash = "sha256:82a8d0b81e318cc5ce71a5f1f8b5c4e63619620b63141ef8c995fa0db95a57c4"},
 ]
 
 [[package]]
@@ -89,7 +89,7 @@ files = [
 
 [[package]]
 name = "click"
-version = "8.2.1"
+version = "8.3.0"
 requires_python = ">=3.10"
 summary = "Composable command line interface toolkit"
 groups = ["dev"]
@@ -97,8 +97,8 @@ dependencies = [
     "colorama; platform_system == \"Windows\"",
 ]
 files = [
-    {file = "click-8.2.1-py3-none-any.whl", hash = "sha256:61a3265b914e850b85317d0b3109c7f8cd35a670f963866005d6ef1d5175a12b"},
-    {file = "click-8.2.1.tar.gz", hash = "sha256:27c491cc05d968d271d5a1db13e3b5a184636d9d930f148c50b038f0d0646202"},
+    {file = "click-8.3.0-py3-none-any.whl", hash = "sha256:9b9f285302c6e3064f4330c05f05b81945b2a39544279343e6e7c5f27a9baddc"},
+    {file = "click-8.3.0.tar.gz", hash = "sha256:e7b8232224eba16f4ebe410c25ced9f7875cb5f3263ffc93cc3e8da705e229c4"},
 ]
 
 [[package]]
@@ -113,6 +113,151 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "coverage"
+version = "7.11.0"
+requires_python = ">=3.10"
+summary = "Code coverage measurement for Python"
+groups = ["dev"]
+files = [
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+    {file = "coverage-7.11.0-cp313-cp313-macosx_11_0_arm64.whl", hash = "sha256:f39ae2f63f37472c17b4990f794035c9890418b1b8cca75c01193f3c8d3e01be"},
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+requires_python = ">=3.10"
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+groups = ["dev"]
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+groups = ["dev"]
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-    {file = "pydantic_core-2.33.2-cp312-cp312-win32.whl", hash = "sha256:9cb1da0f5a471435a7bc7e439b8a728e8b61e59784b2af70d7c169f8dd8ae290"},
-    {file = "pydantic_core-2.33.2-cp312-cp312-win_amd64.whl", hash = "sha256:f941635f2a3d96b2973e867144fde513665c87f13fe0e193c158ac51bfaaa7b2"},
-    {file = "pydantic_core-2.33.2-cp312-cp312-win_arm64.whl", hash = "sha256:cca3868ddfaccfbc4bfb1d608e2ccaaebe0ae628e1416aeb9c4d88c001bb45ab"},
     {file = "pydantic_core-2.33.2-cp313-cp313-macosx_10_12_x86_64.whl", hash = "sha256:1082dd3e2d7109ad8b7da48e1d4710c8d06c253cbc4a27c1cff4fbcaa97a9e3f"},
     {file = "pydantic_core-2.33.2-cp313-cp313-macosx_11_0_arm64.whl", hash = "sha256:f517ca031dfc037a9c07e748cefd8d96235088b83b4f4ba8939105d20fa1dcd6"},
     {file = "pydantic_core-2.33.2-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:0a9f2c9dd19656823cb8250b0724ee9c60a82f3cdf68a080979d13092a3b0fef"},
@@ -502,24 +606,6 @@ files = [
     {file = "pydantic_core-2.33.2-cp313-cp313t-macosx_11_0_arm64.whl", hash = "sha256:61c18fba8e5e9db3ab908620af374db0ac1baa69f0f32df4f61ae23f15e586ac"},
     {file = "pydantic_core-2.33.2-cp313-cp313t-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:95237e53bb015f67b63c91af7518a62a8660376a6a0db19b89acc77a4d6199f5"},
     {file = "pydantic_core-2.33.2-cp313-cp313t-win_amd64.whl", hash = "sha256:c2fc0a768ef76c15ab9238afa6da7f69895bb5d1ee83aeea2e3509af4472d0b9"},
-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-macosx_10_12_x86_64.whl", hash = "sha256:5c4aa4e82353f65e548c476b37e64189783aa5384903bfea4f41580f255fddfa"},
-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-macosx_11_0_arm64.whl", hash = "sha256:d946c8bf0d5c24bf4fe333af284c59a19358aa3ec18cb3dc4370080da1e8ad29"},
-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:87b31b6846e361ef83fedb187bb5b4372d0da3f7e28d85415efa92d6125d6e6d"},
-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:aa9d91b338f2df0508606f7009fde642391425189bba6d8c653afd80fd6bb64e"},
-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:2058a32994f1fde4ca0480ab9d1e75a0e8c87c22b53a3ae66554f9af78f2fe8c"},
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-    {file = "pydantic_core-2.33.2-pp310-pypy310_pp73-win_amd64.whl", hash = "sha256:a11c8d26a50bfab49002947d3d237abe4d9e4b5bdc8846a63537b6488e197808"},
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-    {file = "pydantic_core-2.33.2-pp311-pypy311_pp73-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:64632ff9d614e5eecfb495796ad51b0ed98c453e447a76bcbeeb69615079fc7e"},
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-    {file = "pydantic_core-2.33.2-pp311-pypy311_pp73-musllinux_1_1_armv7l.whl", hash = "sha256:de4b83bb311557e439b9e186f733f6c645b9417c84e2eb8203f3f820a4b988bf"},
-    {file = "pydantic_core-2.33.2-pp311-pypy311_pp73-musllinux_1_1_x86_64.whl", hash = "sha256:82f68293f055f51b51ea42fafc74b6aad03e70e191799430b90c13d643059ebb"},
-    {file = "pydantic_core-2.33.2-pp311-pypy311_pp73-win_amd64.whl", hash = "sha256:329467cecfb529c925cf2bbd4d60d2c509bc2fb52a20c1045bf09bb70971a9c1"},
     {file = "pydantic_core-2.33.2.tar.gz", hash = "sha256:7cb8bc3605c29176e1b105350d2e6474142d7c1bd1d9327c4a9bdb46bf827acc"},
 ]
 
@@ -581,6 +667,47 @@ files = [
     {file = "pytest-8.4.2.tar.gz", hash = "sha256:86c0d0b93306b961d58d62a4db4879f27fe25513d4b969df351abdddb3c30e01"},
 ]
 
+[[package]]
+name = "pytest-asyncio"
+version = "0.24.0"
+requires_python = ">=3.8"
+summary = "Pytest support for asyncio"
+groups = ["dev"]
+dependencies = [
+    "pytest<9,>=8.2",
+]
+files = [
+    {file = "pytest_asyncio-0.24.0-py3-none-any.whl", hash = "sha256:a811296ed596b69bf0b6f3dc40f83bcaf341b155a269052d82efa2b25ac7037b"},
+    {file = "pytest_asyncio-0.24.0.tar.gz", hash = "sha256:d081d828e576d85f875399194281e92bf8a68d60d72d1a2faf2feddb6c46b276"},
+]
+
+[[package]]
+name = "pytest-cov"
+version = "5.0.0"
+requires_python = ">=3.8"
+summary = "Pytest plugin for measuring coverage."
+groups = ["dev"]
+dependencies = [
+    "coverage[toml]>=5.2.1",
+    "pytest>=4.6",
+]
+files = [
+    {file = "pytest-cov-5.0.0.tar.gz", hash = "sha256:5837b58e9f6ebd335b0f8060eecce69b662415b16dc503883a02f45dfeb14857"},
+    {file = "pytest_cov-5.0.0-py3-none-any.whl", hash = "sha256:4f0764a1219df53214206bf1feea4633c3b558a2925c8b59f144f682861ce652"},
+]
+
+[[package]]
+name = "pytest-faker"
+version = "2.0.0"
+summary = "Faker integration with the pytest framework."
+groups = ["dev"]
+dependencies = [
+    "Faker>=0.7.3",
+]
+files = [
+    {file = "pytest-faker-2.0.0.tar.gz", hash = "sha256:6b37bb89d94f96552bfa51f8e8b89d32addded8ddb58a331488299ef0137d9b6"},
+]
+
 [[package]]
 name = "pytest-mock"
 version = "3.15.1"
@@ -608,13 +735,13 @@ files = [
 
 [[package]]
 name = "pytokens"
-version = "0.1.10"
+version = "0.2.0"
 requires_python = ">=3.8"
-summary = "A Fast, spec compliant Python 3.12+ tokenizer that runs on older Pythons."
+summary = "A Fast, spec compliant Python 3.13+ tokenizer that runs on older Pythons."
 groups = ["dev"]
 files = [
-    {file = "pytokens-0.1.10-py3-none-any.whl", hash = "sha256:db7b72284e480e69fb085d9f251f66b3d2df8b7166059261258ff35f50fb711b"},
-    {file = "pytokens-0.1.10.tar.gz", hash = "sha256:c9a4bfa0be1d26aebce03e6884ba454e842f186a59ea43a6d3b25af58223c044"},
+    {file = "pytokens-0.2.0-py3-none-any.whl", hash = "sha256:74d4b318c67f4295c13782ddd9abcb7e297ec5630ad060eb90abf7ebbefe59f8"},
+    {file = "pytokens-0.2.0.tar.gz", hash = "sha256:532d6421364e5869ea57a9523bf385f02586d4662acbcc0342afd69511b4dd43"},
 ]
 
 [[package]]
@@ -691,18 +818,18 @@ files = [
 
 [[package]]
 name = "typing-extensions"
-version = "4.14.1"
+version = "4.15.0"
 requires_python = ">=3.9"
 summary = "Backported and Experimental Type Hints for Python 3.9+"
 groups = ["default", "dev"]
 files = [
-    {file = "typing_extensions-4.14.1-py3-none-any.whl", hash = "sha256:d1e1e3b58374dc93031d6eda2420a48ea44a36c2b4766a4fdeb3710755731d76"},
-    {file = "typing_extensions-4.14.1.tar.gz", hash = "sha256:38b39f4aeeab64884ce9f74c94263ef78f3c22467c8724005483154c26648d36"},
+    {file = "typing_extensions-4.15.0-py3-none-any.whl", hash = "sha256:f0fa19c6845758ab08074a0cfa8b7aecb71c999ca73d62883bc25cc018c4e548"},
+    {file = "typing_extensions-4.15.0.tar.gz", hash = "sha256:0cea48d173cc12fa28ecabc3b837ea3cf6f38c6d1136f85cbaaf598984861466"},
 ]
 
 [[package]]
 name = "typing-inspection"
-version = "0.4.1"
+version = "0.4.2"
 requires_python = ">=3.9"
 summary = "Runtime typing introspection tools"
 groups = ["default"]
@@ -710,8 +837,19 @@ dependencies = [
     "typing-extensions>=4.12.0",
 ]
 files = [
-    {file = "typing_inspection-0.4.1-py3-none-any.whl", hash = "sha256:389055682238f53b04f7badcb49b989835495a96700ced5dab2d8feae4b26f51"},
-    {file = "typing_inspection-0.4.1.tar.gz", hash = "sha256:6ae134cc0203c33377d43188d4064e9b357dba58cff3185f22924610e70a9d28"},
+    {file = "typing_inspection-0.4.2-py3-none-any.whl", hash = "sha256:4ed1cacbdc298c220f1bd249ed5287caa16f34d44ef4e9c3d0cbad5b521545e7"},
+    {file = "typing_inspection-0.4.2.tar.gz", hash = "sha256:ba561c48a67c5958007083d386c3295464928b01faa735ab8547c5692e87f464"},
+]
+
+[[package]]
+name = "tzdata"
+version = "2025.2"
+requires_python = ">=2"
+summary = "Provider of IANA time zone data"
+groups = ["dev"]
+files = [
+    {file = "tzdata-2025.2-py2.py3-none-any.whl", hash = "sha256:1a403fada01ff9221ca8044d701868fa132215d84beb92242d9acd2147f667a8"},
+    {file = "tzdata-2025.2.tar.gz", hash = "sha256:b60a638fcc0daffadf82fe0f57e53d06bdec2f36c4df66280ae79bce6bd6f2b9"},
 ]
 
 [[package]]
diff --git a/pyproject.toml b/pyproject.toml
index 519ef09..f367c1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -93,6 +93,24 @@ plugins = ["pydantic.mypy"]
 module = "asyncpg.*"
 ignore_missing_imports = true
 
+[tool.pytest.ini_options]
+addopts = "--import-mode=importlib"
+asyncio_mode = "strict"
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+
+[tool.coverage.run]
+source = ["src/commentservice"]
+relative_files = true
+
+[tool.coverage.report]
+include = [
+    "src/commentservice/handler/*",
+    "src/commentservice/service/*",
+    "src/commentservice/repository/*",
+]
+omit = ["src/commentservice/server.py"]
+
 [project]
 name = "commentservice"
 version = "0.0.1"
@@ -122,7 +140,11 @@ dev = [
     "grpc-stubs==1.53.0.6",
     "protobuf==6.32.1",
     "pytest==8.4.2",
+    "pytest-asyncio==0.24.0",
+    "pytest-cov==5.0.0",
     "pytest-mock==3.15.1",
+    "pytest-faker==2.0.0",
+    "Faker==37.11.0",
     "black==25.9.0",
     "isort==6.0.1",
     "flake8==7.3.0",
diff --git a/tests/handler/test_create_comment.py b/tests/handler/test_create_comment.py
index db069ee..c0d901b 100644
--- a/tests/handler/test_create_comment.py
+++ b/tests/handler/test_create_comment.py
@@ -1,4 +1,8 @@
+from unittest.mock import AsyncMock
+
 import grpc
+import pytest
+from faker import Faker
 from pytest_mock import MockerFixture
 
 from commentservice.grpc.comment_pb2 import (
@@ -9,20 +13,27 @@
 from commentservice.service.service import CommentService
 
 
-def test_create_comment_success(mocker: MockerFixture) -> None:
+@pytest.mark.asyncio
+async def test_create_comment_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
     ctx = mocker.Mock(spec=grpc.ServicerContext)
     fake_service = mocker.Mock(spec=CommentService)
-    fake_service.create_comment.return_value = 42
+    new_id = faker.random_int(min=1, max=100000)
+    fake_service.create_comment = AsyncMock(return_value=new_id)
 
+    mod_id = faker.random_int(min=1, max=100000)
+    author_id = faker.random_int(min=1, max=100000)
+    text = faker.sentence()
     request = CreateCommentRequest(
-        mod_id=7,
-        author_id=13,
-        text="Test text",
+        mod_id=mod_id, author_id=author_id, text=text
     )
 
-    response = CreateComment(fake_service, request, ctx)
+    response = await CreateComment(fake_service, request, ctx)
 
     assert isinstance(response, CreateCommentResponse)
-    assert response.comment_id == 42
+    assert response.comment_id == new_id
 
-    fake_service.create_comment.assert_called_once_with(7, 13, "Test text")
+    fake_service.create_comment.assert_awaited_once_with(
+        mod_id, author_id, text
+    )
diff --git a/tests/handler/test_delete_comment.py b/tests/handler/test_delete_comment.py
new file mode 100644
index 0000000..ee87f94
--- /dev/null
+++ b/tests/handler/test_delete_comment.py
@@ -0,0 +1,47 @@
+from unittest.mock import AsyncMock
+
+import grpc
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.grpc.comment_pb2 import (
+    DeleteCommentRequest,
+    DeleteCommentResponse,
+)
+from commentservice.handler.delete_comment import DeleteComment
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_delete_comment_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    ctx = mocker.Mock(spec=grpc.ServicerContext)
+    fake_service = mocker.Mock(spec=CommentService)
+    fake_service.delete_comment = AsyncMock(return_value=True)
+
+    comment_id = faker.random_int(min=1, max=100000)
+    request = DeleteCommentRequest(comment_id=comment_id)
+
+    response = await DeleteComment(fake_service, request, ctx)
+
+    assert isinstance(response, DeleteCommentResponse)
+    assert response.success is True
+    fake_service.delete_comment.assert_awaited_once_with(comment_id)
+
+
+@pytest.mark.asyncio
+async def test_delete_comment_not_found(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    ctx = mocker.Mock(spec=grpc.ServicerContext)
+    fake_service = mocker.Mock(spec=CommentService)
+    fake_service.delete_comment = AsyncMock(return_value=False)
+
+    comment_id = faker.random_int(min=1, max=100000)
+    request = DeleteCommentRequest(comment_id=comment_id)
+    response = await DeleteComment(fake_service, request, ctx)
+
+    assert response.success is False
+    fake_service.delete_comment.assert_awaited_once_with(comment_id)
diff --git a/tests/handler/test_edit_comment.py b/tests/handler/test_edit_comment.py
new file mode 100644
index 0000000..24345d8
--- /dev/null
+++ b/tests/handler/test_edit_comment.py
@@ -0,0 +1,48 @@
+from unittest.mock import AsyncMock
+
+import grpc
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.grpc.comment_pb2 import (
+    EditCommentRequest,
+    EditCommentResponse,
+)
+from commentservice.handler.edit_comment import EditComment
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_edit_comment_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    ctx = mocker.Mock(spec=grpc.ServicerContext)
+    fake_service = mocker.Mock(spec=CommentService)
+    fake_service.edit_comment = AsyncMock(return_value=True)
+
+    comment_id = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+    request = EditCommentRequest(comment_id=comment_id, text=new_text)
+    response = await EditComment(fake_service, request, ctx)
+
+    assert isinstance(response, EditCommentResponse)
+    assert response.success is True
+    fake_service.edit_comment.assert_awaited_once_with(comment_id, new_text)
+
+
+@pytest.mark.asyncio
+async def test_edit_comment_not_found(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    ctx = mocker.Mock(spec=grpc.ServicerContext)
+    fake_service = mocker.Mock(spec=CommentService)
+    fake_service.edit_comment = AsyncMock(return_value=False)
+
+    comment_id = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+    request = EditCommentRequest(comment_id=comment_id, text=new_text)
+    response = await EditComment(fake_service, request, ctx)
+
+    assert response.success is False
+    fake_service.edit_comment.assert_awaited_once_with(comment_id, new_text)
diff --git a/tests/handler/test_get_comments.py b/tests/handler/test_get_comments.py
new file mode 100644
index 0000000..4d4937b
--- /dev/null
+++ b/tests/handler/test_get_comments.py
@@ -0,0 +1,66 @@
+from datetime import UTC, timedelta
+
+import grpc
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.grpc.comment_pb2 import (
+    GetCommentsRequest,
+    GetCommentsResponse,
+)
+from commentservice.handler.get_comments import GetComments, ts_to_dt
+from commentservice.repository.model import Comment
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_get_comments_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    ctx = mocker.Mock(spec=grpc.ServicerContext)
+    fake_service = mocker.Mock(spec=CommentService)
+
+    now = faker.date_time(tzinfo=UTC)
+    earlier = now - timedelta(hours=faker.random_int(min=1, max=12))
+
+    comment1 = Comment(
+        id=faker.random_int(min=1, max=100000),
+        author_id=faker.random_int(min=1, max=100000),
+        text=faker.sentence(),
+        created_at=earlier,
+        edited_at=None,
+    )
+    comment2 = Comment(
+        id=faker.random_int(min=1, max=100000),
+        author_id=faker.random_int(min=1, max=100000),
+        text=faker.sentence(),
+        created_at=now,
+        edited_at=now,
+    )
+    comments = [comment1, comment2]
+    fake_service.get_comments.return_value = comments
+
+    mod_id = faker.random_int(min=1, max=100000)
+    request = GetCommentsRequest(mod_id=mod_id)
+    response = await GetComments(fake_service, request, ctx)
+
+    assert isinstance(response, GetCommentsResponse)
+    assert response.mod_id == mod_id
+    assert len(response.comments) == 2
+
+    c1 = response.comments[0]
+    assert c1.id == comment1.id
+    assert c1.author_id == comment1.author_id
+    assert c1.text == comment1.text
+    assert not c1.HasField("edited_at")
+    assert ts_to_dt(c1.created_at, tz=UTC) == earlier
+
+    c2 = response.comments[1]
+    assert c2.id == comment2.id
+    assert c2.author_id == comment2.author_id
+    assert c2.text == comment2.text
+    assert c2.HasField("edited_at")
+    assert ts_to_dt(c2.created_at, tz=UTC) == now
+
+    fake_service.get_comments.assert_called_once_with(mod_id=mod_id)
diff --git a/tests/handler/test_handler.py b/tests/handler/test_handler.py
new file mode 100644
index 0000000..442df42
--- /dev/null
+++ b/tests/handler/test_handler.py
@@ -0,0 +1,130 @@
+from collections.abc import Callable
+from dataclasses import dataclass
+from typing import Any
+from unittest.mock import AsyncMock
+
+import grpc
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+import commentservice.handler.handler as handler_module
+from commentservice.grpc import comment_pb2
+from commentservice.handler.handler import CommentHandler
+from commentservice.service.service import CommentService
+
+
+def _build_create_pair(
+    faker: Faker,
+) -> tuple[
+    comment_pb2.CreateCommentRequest, comment_pb2.CreateCommentResponse
+]:
+    mod_id = faker.random_int(min=1, max=100000)
+    author_id = faker.random_int(min=1, max=100000)
+    text = faker.sentence()
+    response = comment_pb2.CreateCommentResponse(
+        comment_id=faker.random_int(min=1, max=100000)
+    )
+    request = comment_pb2.CreateCommentRequest(
+        mod_id=mod_id,
+        author_id=author_id,
+        text=text,
+    )
+    return request, response
+
+
+def _build_edit_pair(
+    faker: Faker,
+) -> tuple[comment_pb2.EditCommentRequest, comment_pb2.EditCommentResponse]:
+    comment_id = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+    response = comment_pb2.EditCommentResponse(success=True)
+    request = comment_pb2.EditCommentRequest(
+        comment_id=comment_id, text=new_text
+    )
+    return request, response
+
+
+def _build_delete_pair(
+    faker: Faker,
+) -> tuple[
+    comment_pb2.DeleteCommentRequest, comment_pb2.DeleteCommentResponse
+]:
+    comment_id = faker.random_int(min=1, max=100000)
+    response = comment_pb2.DeleteCommentResponse(success=True)
+    request = comment_pb2.DeleteCommentRequest(comment_id=comment_id)
+    return request, response
+
+
+def _build_get_pair(
+    faker: Faker,
+) -> tuple[comment_pb2.GetCommentsRequest, comment_pb2.GetCommentsResponse]:
+    mod_id = faker.random_int(min=1, max=100000)
+    response = comment_pb2.GetCommentsResponse(mod_id=mod_id)
+    response.comments.add(
+        id=faker.random_int(min=1, max=100000),
+        author_id=faker.random_int(min=1, max=100000),
+        text=faker.sentence(),
+    )
+    request = comment_pb2.GetCommentsRequest(mod_id=mod_id)
+    return request, response
+
+
+@dataclass(frozen=True)
+class HandlerCase:
+    method_name: str
+    helper_attr: str
+    builder: Callable[[Faker], tuple[Any, Any]]
+
+
+CASES: tuple[HandlerCase, ...] = (
+    HandlerCase(
+        "CreateComment",
+        "_create_comment",
+        _build_create_pair,
+    ),
+    HandlerCase(
+        "EditComment",
+        "_edit_comment",
+        _build_edit_pair,
+    ),
+    HandlerCase(
+        "DeleteComment",
+        "_delete_comment",
+        _build_delete_pair,
+    ),
+    HandlerCase(
+        "GetComments",
+        "_get_comments",
+        _build_get_pair,
+    ),
+)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "case",
+    CASES,
+    ids=lambda case: case.method_name,
+)
+async def test_comment_handler_delegates_to_helper(
+    mocker: MockerFixture,
+    faker: Faker,
+    case: HandlerCase,
+) -> None:
+    service = mocker.Mock(spec=CommentService)
+    handler = CommentHandler(service)
+    request, expected_response = case.builder(faker)
+
+    helper = mocker.patch.object(
+        handler_module,
+        case.helper_attr,
+        new=AsyncMock(return_value=expected_response),
+    )
+    context = mocker.Mock(spec=grpc.ServicerContext)
+
+    method = getattr(handler, case.method_name)
+    result = await method(request, context)
+
+    assert result is expected_response
+    helper.assert_awaited_once_with(service, request, context)
diff --git a/tests/repository/test_create_comment.py b/tests/repository/test_create_comment.py
new file mode 100644
index 0000000..564d5c5
--- /dev/null
+++ b/tests/repository/test_create_comment.py
@@ -0,0 +1,45 @@
+import textwrap
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+
+
+@pytest.mark.asyncio
+async def test_repo_create_comment_returns_id(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    comment_id = faker.random_int(min=1, max=100000)
+    conn = mocker.Mock()
+    conn.fetchval = AsyncMock(return_value=comment_id)
+
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+
+    repo = CommentRepository(pool)
+    mod_id = faker.random_int(min=1, max=100000)
+    author_id = faker.random_int(min=1, max=100000)
+    text = faker.sentence()
+    new_id = await repo.create_comment(
+        mod_id=mod_id, author_id=author_id, text=text
+    )
+
+    assert new_id == comment_id
+    assert conn.fetchval.await_count == 1
+    expected_sql = """
+            INSERT INTO comments (mod_id, author_id, text)
+            VALUES ($1, $2, $3)
+            RETURNING id
+            """
+    actual_sql = conn.fetchval.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetchval.await_args.args[1:] == (mod_id, author_id, text)
diff --git a/tests/repository/test_delete_comment.py b/tests/repository/test_delete_comment.py
new file mode 100644
index 0000000..b5f48c0
--- /dev/null
+++ b/tests/repository/test_delete_comment.py
@@ -0,0 +1,68 @@
+import textwrap
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+
+
+@pytest.mark.asyncio
+async def test_repo_delete_comment_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    conn = mocker.Mock()
+    conn.fetchval = AsyncMock()
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+    repo = CommentRepository(pool)
+
+    cid = faker.random_int(min=1, max=100000)
+    conn.fetchval.return_value = cid
+
+    ok = await repo.delete_comment(comment_id=cid)
+    assert ok is True
+    expected_sql = """
+            DELETE FROM comments
+            WHERE id = $1
+            RETURNING id
+            """
+    actual_sql = conn.fetchval.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetchval.await_args.args[1:] == (cid,)
+
+
+@pytest.mark.asyncio
+async def test_repo_delete_comment_not_found(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    conn = mocker.Mock()
+    conn.fetchval = AsyncMock(return_value=None)
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+    repo = CommentRepository(pool)
+
+    cid = faker.random_int(min=1, max=100000)
+    ok = await repo.delete_comment(comment_id=cid)
+    assert ok is False
+    expected_sql = """
+            DELETE FROM comments
+            WHERE id = $1
+            RETURNING id
+            """
+    actual_sql = conn.fetchval.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetchval.await_args.args[1:] == (cid,)
diff --git a/tests/repository/test_edit_comment.py b/tests/repository/test_edit_comment.py
new file mode 100644
index 0000000..198dea4
--- /dev/null
+++ b/tests/repository/test_edit_comment.py
@@ -0,0 +1,71 @@
+import textwrap
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+
+
+@pytest.mark.asyncio
+async def test_repo_edit_comment_success(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    conn = mocker.Mock()
+    conn.fetchval = AsyncMock()
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+    repo = CommentRepository(pool)
+
+    cid = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+    conn.fetchval.return_value = cid
+    ok = await repo.edit_comment(comment_id=cid, new_text=new_text)
+    assert ok is True
+    expected_sql = """
+            UPDATE comments
+            SET text = $1, edited_at = NOW()
+            WHERE id = $2
+            RETURNING id
+            """
+    actual_sql = conn.fetchval.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetchval.await_args.args[1:] == (new_text, cid)
+
+
+@pytest.mark.asyncio
+async def test_repo_edit_comment_not_found(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    conn = mocker.Mock()
+    conn.fetchval = AsyncMock(return_value=None)
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+    repo = CommentRepository(pool)
+
+    cid = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+    ok = await repo.edit_comment(comment_id=cid, new_text=new_text)
+    assert ok is False
+    expected_sql = """
+            UPDATE comments
+            SET text = $1, edited_at = NOW()
+            WHERE id = $2
+            RETURNING id
+            """
+    actual_sql = conn.fetchval.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetchval.await_args.args[1:] == (new_text, cid)
diff --git a/tests/repository/test_get_comments.py b/tests/repository/test_get_comments.py
new file mode 100644
index 0000000..03981b5
--- /dev/null
+++ b/tests/repository/test_get_comments.py
@@ -0,0 +1,61 @@
+import textwrap
+from datetime import UTC
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+
+
+@pytest.mark.asyncio
+async def test_repo_get_comments_maps_rows(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    rows = [
+        {
+            "id": faker.random_int(),
+            "author_id": faker.random_int(),
+            "text": faker.sentence(),
+            "created_at": faker.date_time(tzinfo=UTC),
+            "edited_at": None,
+        },
+        {
+            "id": faker.random_int(),
+            "author_id": faker.random_int(),
+            "text": faker.sentence(),
+            "created_at": faker.date_time(tzinfo=UTC),
+            "edited_at": faker.date_time(tzinfo=UTC),
+        },
+    ]
+
+    conn = mocker.Mock()
+    conn.fetch = AsyncMock(return_value=rows)
+    pool = mocker.Mock()
+    pool.acquire = mocker.Mock()
+    pool.acquire.return_value = AsyncMock()
+    pool.acquire.return_value.__aenter__.return_value = conn
+    pool.acquire.return_value.__aexit__.return_value = None
+    repo = CommentRepository(pool)
+
+    mod_id = faker.random_int(min=1, max=100000)
+
+    out = await repo.get_comments(mod_id=mod_id)
+
+    assert len(out) == 2
+    assert out[0].id == rows[0]["id"] and out[0].text == rows[0]["text"]
+    assert out[0].edited_at is None
+    assert out[1].id == rows[1]["id"] and out[1].text == rows[1]["text"]
+    assert out[1].edited_at is not None
+    expected_sql = """
+            SELECT id, author_id, text, created_at, edited_at
+            FROM comments
+            WHERE mod_id = $1
+            """
+    actual_sql = conn.fetch.await_args.args[0]
+    assert (
+        textwrap.dedent(actual_sql).strip()
+        == textwrap.dedent(expected_sql).strip()
+    )
+    assert conn.fetch.await_args.args[1:] == (mod_id,)
diff --git a/tests/service/test_create_comment.py b/tests/service/test_create_comment.py
new file mode 100644
index 0000000..4f6e216
--- /dev/null
+++ b/tests/service/test_create_comment.py
@@ -0,0 +1,29 @@
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_service_create_comment(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    fake_repo = mocker.Mock(spec=CommentRepository)
+    new_id = faker.random_int(min=1, max=100000)
+    fake_repo.create_comment = AsyncMock(return_value=new_id)
+
+    mod_id = faker.random_int(min=1, max=100000)
+    author_id = faker.random_int(min=1, max=100000)
+    text = faker.sentence()
+
+    service = CommentService(fake_repo)
+    result = await service.create_comment(
+        mod_id=mod_id, author_id=author_id, text=text
+    )
+
+    assert result == new_id
+    fake_repo.create_comment.assert_awaited_once_with(mod_id, author_id, text)
diff --git a/tests/service/test_delete_comment.py b/tests/service/test_delete_comment.py
new file mode 100644
index 0000000..5db3a93
--- /dev/null
+++ b/tests/service/test_delete_comment.py
@@ -0,0 +1,24 @@
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_service_delete_comment(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    fake_repo = mocker.Mock(spec=CommentRepository)
+    fake_repo.delete_comment = AsyncMock(return_value=True)
+
+    comment_id = faker.random_int(min=1, max=100000)
+
+    service = CommentService(fake_repo)
+    result = await service.delete_comment(comment_id=comment_id)
+
+    assert result is True
+    fake_repo.delete_comment.assert_awaited_once_with(comment_id)
diff --git a/tests/service/test_edit_comment.py b/tests/service/test_edit_comment.py
new file mode 100644
index 0000000..c9d750d
--- /dev/null
+++ b/tests/service/test_edit_comment.py
@@ -0,0 +1,27 @@
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.repository import CommentRepository
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_service_edit_comment(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    fake_repo = mocker.Mock(spec=CommentRepository)
+    fake_repo.edit_comment = AsyncMock(return_value=True)
+
+    comment_id = faker.random_int(min=1, max=100000)
+    new_text = faker.sentence()
+
+    service = CommentService(fake_repo)
+    result = await service.edit_comment(
+        comment_id=comment_id, new_text=new_text
+    )
+
+    assert result is True
+    fake_repo.edit_comment.assert_awaited_once_with(comment_id, new_text)
diff --git a/tests/service/test_get_comments.py b/tests/service/test_get_comments.py
new file mode 100644
index 0000000..6ad2343
--- /dev/null
+++ b/tests/service/test_get_comments.py
@@ -0,0 +1,41 @@
+from datetime import UTC
+from unittest.mock import AsyncMock
+
+import pytest
+from faker import Faker
+from pytest_mock import MockerFixture
+
+from commentservice.repository.model import Comment
+from commentservice.repository.repository import CommentRepository
+from commentservice.service.service import CommentService
+
+
+@pytest.mark.asyncio
+async def test_service_get_comments(
+    mocker: MockerFixture, faker: Faker
+) -> None:
+    fake_repo = mocker.Mock(spec=CommentRepository)
+    comments = [
+        Comment(
+            id=faker.random_int(),
+            author_id=faker.random_int(),
+            text=faker.sentence(),
+            created_at=faker.date_time(tzinfo=UTC),
+            edited_at=None,
+        ),
+        Comment(
+            id=faker.random_int(),
+            author_id=faker.random_int(),
+            text=faker.sentence(),
+            created_at=faker.date_time(tzinfo=UTC),
+            edited_at=None,
+        ),
+    ]
+    fake_repo.get_comments = AsyncMock(return_value=comments)
+
+    mod_id = faker.random_int(min=1, max=100000)
+    service = CommentService(fake_repo)
+    out = await service.get_comments(mod_id=mod_id)
+
+    assert out == comments
+    fake_repo.get_comments.assert_awaited_once_with(mod_id)
diff --git a/tools/common.just b/tools/common.just
index 883b36c..b4cdc97 100644
--- a/tools/common.just
+++ b/tools/common.just
@@ -39,6 +39,8 @@ lint:
     mypy --strict .
 
 test:
-    pytest
+    pytest \
+      --cov=src/{{SOURCE}} \
+      --cov-report=xml:coverage.xml
 
 prepare: format lint test
diff --git a/tools/load_envs.sh b/tools/load_envs.sh
index e713b7b..cbc4a4b 100644
--- a/tools/load_envs.sh
+++ b/tools/load_envs.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-if [ -f .env ]; then
+if [ "$ENV" = "prod" ] && [ -f .env ]; then
     export $(grep -v '^#' .env | sed 's/^[[:space:]]*//;s/[[:space:]]*$//' | sed 's/"//g' | sed "s/'//g" | xargs)
 fi