diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..edb6db6
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,40 @@
+name: ci
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+env:
+  # Path to where test results will be saved.
+  TEST_RESULTS: /tmp/test-results
+  # Default version of Go to use by CI workflows. This should be the latest
+  # release of Go; developers likely use the latest release in development and
+  # we want to catch any bugs (e.g. lint errors, race detection) with this
+  # release before they are merged. The Go compatibility guarantees ensure
+  # backwards compatibility with the previous two minor releases and we
+  # explicitly test our code for these versions so keeping this at prior
+  # versions does not add value.
+  DEFAULT_GO_VERSION: "1.21"
+
+jobs:
+  test-coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+      - name: Setup Environment
+        run: |
+          echo "GOPATH=$(go env GOPATH)" >> $GITHUB_ENV
+          echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
+      - name: Install Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.DEFAULT_GO_VERSION }}
+          cache-dependency-path: "**/go.sum"
+      - name: Run coverage tests
+        run: |
+          make test-coverage
+      - name: Upload coverage reports to codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3c1afc2
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,26 @@
+.PHONY: test-coverage
+
+ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
+
+TOOLS = $(CURDIR)/.tools
+
+$(TOOLS):
+	@mkdir -p $@
+$(TOOLS)/%: | $(TOOLS)
+	cd $(TOOLS_MOD_DIR) && \
+	$(GO) build -o $@ $(PACKAGE)
+
+GOCOVMERGE = $(TOOLS)/gocovmerge
+$(TOOLS)/gocovmerge: PACKAGE=github.com/wadey/gocovmerge
+
+.PHONY: tools
+tools: $(GOCOVMERGE)
+
+
+test-coverage: | $(GOCOVMERGE)
+		@set -e; \
+		for dir in $(ALL_COVERAGE_MOD_DIRS); do \
+		  (cd "$${dir}" && go test -coverprofile=coverage.out ./... && \
+		  go tool cover -html=coverage.out -o coverage.html); \
+		done; \
+		$(GOCOVMERGE) $$(find . -name coverage.out) > coverage.txt
diff --git a/otelslog/otel_handler_test.go b/otelslog/otel_handler_test.go
index eeafb87..795cf04 100644
--- a/otelslog/otel_handler_test.go
+++ b/otelslog/otel_handler_test.go
@@ -42,7 +42,7 @@ func TestNewOtelHandler(t *testing.T) {
 	)
 
 	handler := NewOtelHandler(loggerProvider, &HandlerOptions{
-		level: slog.LevelInfo,
+		Level: slog.LevelInfo,
 	}).
 		WithAttrs([]slog.Attr{slog.String("first", "value1")}).
 		WithGroup("group1").
diff --git a/otelzap/go.sum b/otelzap/go.sum
index e8decca..03ee8bf 100644
--- a/otelzap/go.sum
+++ b/otelzap/go.sum
@@ -1,18 +1,27 @@
-github.com/agoda-com/opentelemetry-logs-go v0.2.0/go.mod h1:bjUiOkH82zqgjLmxk0v9axmV5b9Ty+1qlixsrAMTLwQ=
+github.com/agoda-com/opentelemetry-logs-go v0.3.0 h1:d2lMVUfCDeLzVgTxMeSU8IWaMXjwD4sVKigEZBGwcsw=
 github.com/agoda-com/opentelemetry-logs-go v0.3.0/go.mod h1:k3QR1O5AOl+dFC7pkrK9wWmoD72jjDONPFHi9dAgLJc=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
 github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
 github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
-go.opentelemetry.io/otel v1.17.0/go.mod h1:I2vmBGtFaODIVMBSTPVDlJSzBDNf93k60E6Ft0nyjo0=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+go.opentelemetry.io/otel v1.18.0 h1:TgVozPGZ01nHyDZxK5WGPFB9QexeTMXEH7+tIClWfzs=
 go.opentelemetry.io/otel v1.18.0/go.mod h1:9lWqYO0Db579XzVuCKFNPDl4s73Voa+zEck3wHaAYQI=
-go.opentelemetry.io/otel/metric v1.17.0/go.mod h1:h4skoxdZI17AxwITdmdZjjYJQH5nzijUUjm+wtPph5o=
+go.opentelemetry.io/otel/metric v1.18.0 h1:JwVzw94UYmbx3ej++CwLUQZxEODDj/pOuTCvzhtRrSQ=
 go.opentelemetry.io/otel/metric v1.18.0/go.mod h1:nNSpsVDjWGfb7chbRLUNW+PBNdcSTHD4Uu5pfFMOI0k=
-go.opentelemetry.io/otel/sdk v1.17.0/go.mod h1:U87sE0f5vQB7hwUoW98pW5Rz4ZDuCFBZFNUBlSgmDFQ=
+go.opentelemetry.io/otel/sdk v1.18.0 h1:e3bAB0wB3MljH38sHzpV/qWrOTCFrdZF2ct9F8rBkcY=
 go.opentelemetry.io/otel/sdk v1.18.0/go.mod h1:1RCygWV7plY2KmdskZEDDBs4tJeHG92MdHZIluiYs/M=
-go.opentelemetry.io/otel/trace v1.17.0/go.mod h1:I/4vKTgFclIsXRVucpH25X0mpFSczM7aHeaz0ZBLWjY=
+go.opentelemetry.io/otel/trace v1.18.0 h1:NY+czwbHbmndxojTEKiSMHkG2ClNH2PwmcHrdo0JY10=
 go.opentelemetry.io/otel/trace v1.18.0/go.mod h1:T2+SGJGuYZY3bjj5rgh/hN7KIrlpWC5nS8Mjvzckz+0=
+go.uber.org/goleak v1.2.1 h1:NBol2c7O1ZokfZ0LEU9K6Whx/KnwvepVetCUhtKja4A=
+go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
 go.uber.org/multierr v1.10.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
-go.uber.org/zap v1.25.0/go.mod h1:JIAUzQIH94IC4fOJQm7gMmBJP5k7wQfdcnYdPoEXJYk=
+go.uber.org/zap v1.26.0 h1:sI7k6L95XOKS281NhVKOFCUNIvv9e0w4BF8N3u+tCRo=
 go.uber.org/zap v1.26.0/go.mod h1:dtElttAiwGvoJ/vj4IwHBS/gXsEu/pZ50mUIRWuG0so=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=