diff --git a/README.md b/README.md
index c128eb832b764806b929ed71930a42a8aaf3ee47..eac7be53bf23562bec8f23577982a87de9b94e37 100644
--- a/README.md
+++ b/README.md
@@ -1,23 +1,29 @@
+[![pipeline status](https://code.vereign.com/gaiax/tsa/cache/badges/main/pipeline.svg)](https://code.vereign.com/gaiax/tsa/cache/-/commits/main)
+[![coverage report](https://code.vereign.com/gaiax/tsa/cache/badges/main/coverage.svg)](https://code.vereign.com/gaiax/tsa/cache/-/commits/main)
+
 # Cache service
 
 Cache service exposes HTTP interface for working with Redis.
 
 ### Basic Architecture
 
-```mermaid
-flowchart LR
-   A[Client] -- request --> B[Cache Service] --> C[(Redis)]
+```mermaid  
+flowchart LR  
+	A[Client] -- request --> B[HTTP API] 
+	subgraph cache 
+		B --> C[(Redis)] 
+	end
 ```
 
 ### API Documentation
 
-The API Documentation is accessible at `/swagger-ui` path in OAS 3.0 format.
-Example: `http://localhost:8080/swagger-ui`
+The API Documentation is accessible at `/swagger-ui` path in OAS 3.0 format. If you
+use the docker-compose environment, it's exposed at `http://localhost:8083/swagger-ui`
 
 ### Dependencies
 
 There must be a running instance of [Redis](https://redis.io/) visible to the service.
-The address, username and password of the Redis in-memory store instance must be provided as environment variables.
+The address, username and password of Redis must be provided as environment variables.
 
 Example:
 ```
@@ -28,11 +34,12 @@ REDIS_PASS="pass"
 
 ### Development
 
-This service uses [Goa framework](https://goa.design/) v3 as a backbone. [This](https://goa.design/learn/getting-started/) is a good starting point for learning to use the framework.
+This service uses [Goa framework](https://goa.design/) v3 as a backbone. 
+[This](https://goa.design/learn/getting-started/) is a good starting point for learning to use the framework.
 
 ### Dependencies and Vendor
 
-The project uses Go modules for managing dependencies and we commit the `vendor` directory.
+The project uses Go modules for managing dependencies, and we commit the `vendor` directory.
 When you add/change dependencies, be sure to clean and update the `vendor` directory before
 submitting your Merge Request for review.
 ```shell
diff --git a/go.mod b/go.mod
index e454d03a8e3ef048190790a11f09abe40c2af08c..616009be42a045932c4f1d15735bcb317052dad1 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	code.vereign.com/gaiax/tsa/golib v0.0.0-20220321093827-5fdf8f34aad9
 	github.com/go-redis/redis/v8 v8.11.5
 	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/stretchr/testify v1.7.0
 	go.uber.org/zap v1.21.0
 	goa.design/goa/v3 v3.7.0
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
@@ -13,6 +14,7 @@ require (
 
 require (
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dimfeld/httppath v0.0.0-20170720192232-ee938bf73598 // indirect
 	github.com/dimfeld/httptreemux/v5 v5.4.0 // indirect
@@ -21,6 +23,7 @@ require (
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/jtolds/gls v4.20.0+incompatible // indirect
 	github.com/manveru/faker v0.0.0-20171103152722-9fbc68a78c4d // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/sergi/go-diff v1.2.0 // indirect
 	github.com/smartystreets/assertions v1.2.1 // indirect
 	github.com/zach-klippenstein/goregen v0.0.0-20160303162051-795b5e3961ea // indirect
@@ -31,4 +34,5 @@ require (
 	golang.org/x/tools v0.1.10 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )
diff --git a/internal/service/cache/cachefakes/fake_cache.go b/internal/service/cache/cachefakes/fake_cache.go
new file mode 100644
index 0000000000000000000000000000000000000000..3f6f044f8ab72d64a1dfa88934c3fad03d574b56
--- /dev/null
+++ b/internal/service/cache/cachefakes/fake_cache.go
@@ -0,0 +1,205 @@
+// Code generated by counterfeiter. DO NOT EDIT.
+package cachefakes
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"code.vereign.com/gaiax/tsa/cache/internal/service/cache"
+)
+
+type FakeCache struct {
+	GetStub        func(context.Context, string) ([]byte, error)
+	getMutex       sync.RWMutex
+	getArgsForCall []struct {
+		arg1 context.Context
+		arg2 string
+	}
+	getReturns struct {
+		result1 []byte
+		result2 error
+	}
+	getReturnsOnCall map[int]struct {
+		result1 []byte
+		result2 error
+	}
+	SetStub        func(context.Context, string, []byte, time.Duration) error
+	setMutex       sync.RWMutex
+	setArgsForCall []struct {
+		arg1 context.Context
+		arg2 string
+		arg3 []byte
+		arg4 time.Duration
+	}
+	setReturns struct {
+		result1 error
+	}
+	setReturnsOnCall map[int]struct {
+		result1 error
+	}
+	invocations      map[string][][]interface{}
+	invocationsMutex sync.RWMutex
+}
+
+func (fake *FakeCache) Get(arg1 context.Context, arg2 string) ([]byte, error) {
+	fake.getMutex.Lock()
+	ret, specificReturn := fake.getReturnsOnCall[len(fake.getArgsForCall)]
+	fake.getArgsForCall = append(fake.getArgsForCall, struct {
+		arg1 context.Context
+		arg2 string
+	}{arg1, arg2})
+	stub := fake.GetStub
+	fakeReturns := fake.getReturns
+	fake.recordInvocation("Get", []interface{}{arg1, arg2})
+	fake.getMutex.Unlock()
+	if stub != nil {
+		return stub(arg1, arg2)
+	}
+	if specificReturn {
+		return ret.result1, ret.result2
+	}
+	return fakeReturns.result1, fakeReturns.result2
+}
+
+func (fake *FakeCache) GetCallCount() int {
+	fake.getMutex.RLock()
+	defer fake.getMutex.RUnlock()
+	return len(fake.getArgsForCall)
+}
+
+func (fake *FakeCache) GetCalls(stub func(context.Context, string) ([]byte, error)) {
+	fake.getMutex.Lock()
+	defer fake.getMutex.Unlock()
+	fake.GetStub = stub
+}
+
+func (fake *FakeCache) GetArgsForCall(i int) (context.Context, string) {
+	fake.getMutex.RLock()
+	defer fake.getMutex.RUnlock()
+	argsForCall := fake.getArgsForCall[i]
+	return argsForCall.arg1, argsForCall.arg2
+}
+
+func (fake *FakeCache) GetReturns(result1 []byte, result2 error) {
+	fake.getMutex.Lock()
+	defer fake.getMutex.Unlock()
+	fake.GetStub = nil
+	fake.getReturns = struct {
+		result1 []byte
+		result2 error
+	}{result1, result2}
+}
+
+func (fake *FakeCache) GetReturnsOnCall(i int, result1 []byte, result2 error) {
+	fake.getMutex.Lock()
+	defer fake.getMutex.Unlock()
+	fake.GetStub = nil
+	if fake.getReturnsOnCall == nil {
+		fake.getReturnsOnCall = make(map[int]struct {
+			result1 []byte
+			result2 error
+		})
+	}
+	fake.getReturnsOnCall[i] = struct {
+		result1 []byte
+		result2 error
+	}{result1, result2}
+}
+
+func (fake *FakeCache) Set(arg1 context.Context, arg2 string, arg3 []byte, arg4 time.Duration) error {
+	var arg3Copy []byte
+	if arg3 != nil {
+		arg3Copy = make([]byte, len(arg3))
+		copy(arg3Copy, arg3)
+	}
+	fake.setMutex.Lock()
+	ret, specificReturn := fake.setReturnsOnCall[len(fake.setArgsForCall)]
+	fake.setArgsForCall = append(fake.setArgsForCall, struct {
+		arg1 context.Context
+		arg2 string
+		arg3 []byte
+		arg4 time.Duration
+	}{arg1, arg2, arg3Copy, arg4})
+	stub := fake.SetStub
+	fakeReturns := fake.setReturns
+	fake.recordInvocation("Set", []interface{}{arg1, arg2, arg3Copy, arg4})
+	fake.setMutex.Unlock()
+	if stub != nil {
+		return stub(arg1, arg2, arg3, arg4)
+	}
+	if specificReturn {
+		return ret.result1
+	}
+	return fakeReturns.result1
+}
+
+func (fake *FakeCache) SetCallCount() int {
+	fake.setMutex.RLock()
+	defer fake.setMutex.RUnlock()
+	return len(fake.setArgsForCall)
+}
+
+func (fake *FakeCache) SetCalls(stub func(context.Context, string, []byte, time.Duration) error) {
+	fake.setMutex.Lock()
+	defer fake.setMutex.Unlock()
+	fake.SetStub = stub
+}
+
+func (fake *FakeCache) SetArgsForCall(i int) (context.Context, string, []byte, time.Duration) {
+	fake.setMutex.RLock()
+	defer fake.setMutex.RUnlock()
+	argsForCall := fake.setArgsForCall[i]
+	return argsForCall.arg1, argsForCall.arg2, argsForCall.arg3, argsForCall.arg4
+}
+
+func (fake *FakeCache) SetReturns(result1 error) {
+	fake.setMutex.Lock()
+	defer fake.setMutex.Unlock()
+	fake.SetStub = nil
+	fake.setReturns = struct {
+		result1 error
+	}{result1}
+}
+
+func (fake *FakeCache) SetReturnsOnCall(i int, result1 error) {
+	fake.setMutex.Lock()
+	defer fake.setMutex.Unlock()
+	fake.SetStub = nil
+	if fake.setReturnsOnCall == nil {
+		fake.setReturnsOnCall = make(map[int]struct {
+			result1 error
+		})
+	}
+	fake.setReturnsOnCall[i] = struct {
+		result1 error
+	}{result1}
+}
+
+func (fake *FakeCache) Invocations() map[string][][]interface{} {
+	fake.invocationsMutex.RLock()
+	defer fake.invocationsMutex.RUnlock()
+	fake.getMutex.RLock()
+	defer fake.getMutex.RUnlock()
+	fake.setMutex.RLock()
+	defer fake.setMutex.RUnlock()
+	copiedInvocations := map[string][][]interface{}{}
+	for key, value := range fake.invocations {
+		copiedInvocations[key] = value
+	}
+	return copiedInvocations
+}
+
+func (fake *FakeCache) recordInvocation(key string, args []interface{}) {
+	fake.invocationsMutex.Lock()
+	defer fake.invocationsMutex.Unlock()
+	if fake.invocations == nil {
+		fake.invocations = map[string][][]interface{}{}
+	}
+	if fake.invocations[key] == nil {
+		fake.invocations[key] = [][]interface{}{}
+	}
+	fake.invocations[key] = append(fake.invocations[key], args)
+}
+
+var _ cache.Cache = new(FakeCache)
diff --git a/internal/service/cache/service.go b/internal/service/cache/service.go
index d12dfd8dabf2748727b870106fb91326eca5d300..dddcc536b7fa04bbed72147d8a5fa93b200589e9 100644
--- a/internal/service/cache/service.go
+++ b/internal/service/cache/service.go
@@ -11,6 +11,8 @@ import (
 	"code.vereign.com/gaiax/tsa/golib/errors"
 )
 
+//go:generate counterfeiter . Cache
+
 type Cache interface {
 	Get(ctx context.Context, key string) ([]byte, error)
 	Set(ctx context.Context, key string, value []byte, ttl time.Duration) error
@@ -33,7 +35,7 @@ func (s *Service) Get(ctx context.Context, req *cache.CacheGetRequest) (interfac
 
 	if req.Key == "" {
 		logger.Error("bad request: missing key")
-		return nil, errors.New(errors.BadRequest, "bad request")
+		return nil, errors.New(errors.BadRequest, "missing key")
 	}
 
 	var namespace, scope string
@@ -69,7 +71,7 @@ func (s *Service) Set(ctx context.Context, req *cache.CacheSetRequest) error {
 
 	if req.Key == "" {
 		logger.Error("bad request: missing key")
-		return errors.New(errors.BadRequest, "bad request")
+		return errors.New(errors.BadRequest, "missing key")
 	}
 
 	var namespace, scope string
@@ -88,7 +90,7 @@ func (s *Service) Set(ctx context.Context, req *cache.CacheSetRequest) error {
 	value, err := json.Marshal(req.Data)
 	if err != nil {
 		logger.Error("error encode payload to json", zap.Error(err))
-		return errors.New("error encode payload to json", err)
+		return errors.New(errors.BadRequest, "cannot encode payload to json", err)
 	}
 
 	if err := s.cache.Set(ctx, key, value, 0); err != nil {
diff --git a/internal/service/cache/service_test.go b/internal/service/cache/service_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..4e09e0314fde2420325949fbbd17e6e3f8d4d338
--- /dev/null
+++ b/internal/service/cache/service_test.go
@@ -0,0 +1,185 @@
+package cache_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"go.uber.org/zap"
+
+	goacache "code.vereign.com/gaiax/tsa/cache/gen/cache"
+	"code.vereign.com/gaiax/tsa/cache/internal/service/cache"
+	"code.vereign.com/gaiax/tsa/cache/internal/service/cache/cachefakes"
+	"code.vereign.com/gaiax/tsa/golib/errors"
+	"code.vereign.com/gaiax/tsa/golib/ptr"
+)
+
+func TestNew(t *testing.T) {
+	svc := cache.New(nil, zap.NewNop())
+	assert.Implements(t, (*goacache.Service)(nil), svc)
+}
+
+func TestService_Get(t *testing.T) {
+	tests := []struct {
+		name  string
+		cache *cachefakes.FakeCache
+		req   *goacache.CacheGetRequest
+
+		res     interface{}
+		errkind errors.Kind
+		errtext string
+	}{
+		{
+			name:    "missing cache key",
+			req:     &goacache.CacheGetRequest{},
+			errkind: errors.BadRequest,
+			errtext: "missing key",
+		},
+		{
+			name: "error getting value from cache",
+			req: &goacache.CacheGetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+			},
+			cache: &cachefakes.FakeCache{
+				GetStub: func(ctx context.Context, key string) ([]byte, error) {
+					return nil, errors.New("some error")
+				},
+			},
+			errkind: errors.Unknown,
+			errtext: "some error",
+		},
+		{
+			name: "key not found in cache",
+			req: &goacache.CacheGetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+			},
+			cache: &cachefakes.FakeCache{
+				GetStub: func(ctx context.Context, key string) ([]byte, error) {
+					return nil, errors.New(errors.NotFound)
+				},
+			},
+			errkind: errors.NotFound,
+			errtext: "key not found in cache",
+		},
+		{
+			name: "value returned from cache is not json",
+			req: &goacache.CacheGetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+			},
+			cache: &cachefakes.FakeCache{
+				GetStub: func(ctx context.Context, key string) ([]byte, error) {
+					return []byte("boom"), nil
+				},
+			},
+			errkind: errors.Unknown,
+			errtext: "cannot decode json value from cache",
+		},
+		{
+			name: "json value is successfully returned from cache",
+			req: &goacache.CacheGetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+			},
+			cache: &cachefakes.FakeCache{
+				GetStub: func(ctx context.Context, key string) ([]byte, error) {
+					return []byte(`{"test":"value"}`), nil
+				},
+			},
+			res:     map[string]interface{}{"test": "value"},
+			errtext: "",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			svc := cache.New(test.cache, zap.NewNop())
+			res, err := svc.Get(context.Background(), test.req)
+			if err == nil {
+				assert.Empty(t, test.errtext)
+				assert.Equal(t, test.res, res)
+			} else {
+				assert.Nil(t, res)
+				assert.Error(t, err)
+
+				e, ok := err.(*errors.Error)
+				assert.True(t, ok)
+				assert.Equal(t, test.errkind, e.Kind)
+				assert.Contains(t, e.Error(), test.errtext)
+			}
+		})
+	}
+}
+
+func TestService_Set(t *testing.T) {
+	tests := []struct {
+		name  string
+		cache *cachefakes.FakeCache
+		req   *goacache.CacheSetRequest
+
+		res     interface{}
+		errkind errors.Kind
+		errtext string
+	}{
+		{
+			name:    "missing cache key",
+			req:     &goacache.CacheSetRequest{},
+			errkind: errors.BadRequest,
+			errtext: "missing key",
+		},
+		{
+			name: "error setting value in cache",
+			req: &goacache.CacheSetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+				Data:      map[string]interface{}{"test": "value"},
+			},
+			cache: &cachefakes.FakeCache{
+				SetStub: func(ctx context.Context, key string, value []byte, ttl time.Duration) error {
+					return errors.New(errors.Timeout, "some error")
+				},
+			},
+			errkind: errors.Timeout,
+			errtext: "some error",
+		},
+		{
+			name: "successfully set value in cache",
+			req: &goacache.CacheSetRequest{
+				Key:       "key",
+				Namespace: ptr.String("namespace"),
+				Scope:     ptr.String("scope"),
+				Data:      map[string]interface{}{"test": "value"},
+			},
+			cache: &cachefakes.FakeCache{
+				SetStub: func(ctx context.Context, key string, value []byte, ttl time.Duration) error {
+					return nil
+				},
+			},
+			errtext: "",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			svc := cache.New(test.cache, zap.NewNop())
+			err := svc.Set(context.Background(), test.req)
+			if err == nil {
+				assert.Empty(t, test.errtext)
+			} else {
+				assert.Error(t, err)
+				e, ok := err.(*errors.Error)
+				assert.True(t, ok)
+				assert.Equal(t, test.errkind, e.Kind)
+				assert.Contains(t, e.Error(), test.errtext)
+			}
+		})
+	}
+}
diff --git a/vendor/code.vereign.com/gaiax/tsa/golib/ptr/ptr.go b/vendor/code.vereign.com/gaiax/tsa/golib/ptr/ptr.go
new file mode 100644
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