diff --git a/go.mod b/go.mod
index b32419e..2d2a961 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module git.optclblast.xyz/optclblast/gustav
 go 1.23.0
 
 require (
-	golang.org/x/sync v0.8.0 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	github.com/davecgh/go-spew v1.1.1
+	golang.org/x/sync v0.8.0
+	gopkg.in/yaml.v3 v3.0.1
 )
diff --git a/go.sum b/go.sum
index f0318be..bddc0c0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,8 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
 golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/config/config.go b/internal/config/config.go
index 809bc99..777d53b 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -2,3 +2,4 @@ package config
 
 type Config struct {
 }
+
diff --git a/internal/pipeline/executor.go b/internal/pipeline/executor.go
index 7af79fc..6ed19fd 100644
--- a/internal/pipeline/executor.go
+++ b/internal/pipeline/executor.go
@@ -93,7 +93,7 @@ func prepareShelling[OutT any](ctx context.Context, cc HttpClient, pre Prepare)
 
 	respBody, err := io.ReadAll(req.Body)
 	if err != nil {
-		return nil, fmt.Errorf("[%s] failed to read response body: %w", err)
+		return nil, fmt.Errorf("[%s] failed to read response body: %w", op, err)
 	}
 
 	out := new(OutT)
diff --git a/internal/pipeline/loader_test.go b/internal/pipeline/loader_test.go
new file mode 100644
index 0000000..092d176
--- /dev/null
+++ b/internal/pipeline/loader_test.go
@@ -0,0 +1,94 @@
+package pipeline
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/davecgh/go-spew/spew"
+	"gopkg.in/yaml.v3"
+)
+
+func TestLoader(t *testing.T) {
+	type args struct {
+		yaml string
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		want    *Pipeline
+		wantErr bool
+	}{
+		{
+			name: "example pipeline",
+			args: args{
+				yaml: `
+name: "My pipeline" # The name of pipeline
+description: "Test pipeline" 
+
+steps: # Steps
+    step1:
+    # The preparatory phase of our pipeline. Here we can perform authorizations and other actions that must 
+    # be performed BEFORE the main part.
+    prepare: 
+        type: "http_call" # Call type. 
+        expected_codes: [200] # Expected return codes
+        # The name of the variable in which the result of this call will be stored. 
+        # This value will be accessible only in scope of current stop.
+        save_into: "prepare_step1_result" 
+        # The name of the variable in which the result of this call will be stored. 
+        # This value will be accessible globally.
+        global_save_into: "global_variable" 
+        call: # Request configuration
+            target: "http://127.0.0.1:8080/login" # Endpoint
+            headers: 
+                secret: "xxx"
+                logon-with: "password"
+            method: "POST" 
+            body: |-
+                {
+                    "login":"admin",
+                    "password":"password"
+                }
+    repeat: 1000 
+    # The main part of the step. The set of requests that will be executed. 
+    # They will be looped until the repeat number reached`,
+			},
+			want: &Pipeline{
+				Name:        "My pipeline",
+				Description: "Test pipeline",
+				Steps: []Step{{
+					Name:   "",
+					Repeat: 1000,
+					Prepare: Prepare{
+						Type:           "http_call",
+						ExpectedCodes:  []int{200},
+						SaveInto:       "prepare_step1_result",
+						GlobalSaveInto: "global_variable",
+						Call: Call{
+							Target: "http://127.0.0.1:8080/login",
+							Headers: map[string]string{
+								"secret":     "xxx",
+								"logon-with": "password",
+							},
+							Method: "POST",
+							Body:   []byte("{\"login\":\"admin\",\"password\":\"password\"}"),
+						},
+					},
+				}},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pipeline := new(Pipeline)
+
+			if err := yaml.Unmarshal([]byte(tt.args.yaml), pipeline); err != nil {
+				t.Fatal(fmt.Errorf("failed to unmarshall pipeline: %v", err))
+			}
+
+			t.Logf("pipeline: %v", spew.Sdump(pipeline))
+		})
+	}
+}
diff --git a/internal/pipeline/reader.go b/internal/pipeline/reader.go
index 0ed7eca..904e4de 100644
--- a/internal/pipeline/reader.go
+++ b/internal/pipeline/reader.go
@@ -37,7 +37,7 @@ func FindPipelines(path string) []string {
 func LoadPipelines(ctx context.Context, paths []string) ([]*Pipeline, error) {
 	pipelines := make([]*Pipeline, len(paths))
 
-	eg, ctx := errgroup.WithContext(ctx)
+	eg, _ := errgroup.WithContext(ctx)
 
 	for i, p := range paths {
 		i := i