added test case

pkg/plugin/definition/publisher.go

@@ -8,6 +8,7 @@ type Publisher interface {
 	Publish(context.Context, string, []byte) error
 }
 
+// PublisherProvider is the interface for creating new Publisher instances.
 type PublisherProvider interface {
 	// New initializes a new publisher instance with the given configuration.
 	New(ctx context.Context, config map[string]string) (Publisher, func() error, error)

pkg/plugin/implementation/publisher/publisher_test.go

@@ -0,0 +1,150 @@
+package publisher
+
+import (
+	"os"
+	"testing"
+)
+
+func TestGetConnURLSuccess(t *testing.T) {
+	tests := []struct {
+		name   string
+		config *Config
+	}{
+		{
+			name: "Valid config with credentials",
+			config: &Config{
+				Addr:   "localhost:5672",
+				UseTLS: false,
+			},
+		},
+		{
+			name: "Valid config with vhost",
+			config: &Config{
+				Addr:   "localhost:5672/myvhost",
+				UseTLS: false,
+			},
+		},
+	}
+
+	// Set valid credentials
+	os.Setenv("RABBITMQ_USERNAME", "guest")
+	os.Setenv("RABBITMQ_PASSWORD", "guest")
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			url, err := GetConnURL(tt.config)
+			if err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if url == "" {
+				t.Error("expected non-empty URL, got empty string")
+			}
+		})
+	}
+}
+
+func TestGetConnURLFailure(t *testing.T) {
+	tests := []struct {
+		name     string
+		username string
+		password string
+		config   *Config
+		wantErr  bool
+	}{
+		{
+			name:     "Missing credentials",
+			username: "",
+			password: "",
+			config:   &Config{Addr: "localhost:5672"},
+			wantErr:  true,
+		},
+		{
+			name:     "Missing config address",
+			username: "guest",
+			password: "guest",
+			config:   &Config{}, // this won't error unless Validate() is called separately
+			wantErr:  false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.username == "" {
+				os.Unsetenv("RABBITMQ_USERNAME")
+			} else {
+				os.Setenv("RABBITMQ_USERNAME", tt.username)
+			}
+
+			if tt.password == "" {
+				os.Unsetenv("RABBITMQ_PASSWORD")
+			} else {
+				os.Setenv("RABBITMQ_PASSWORD", tt.password)
+			}
+
+			url, err := GetConnURL(tt.config)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("unexpected error. gotErr = %v, wantErr = %v", err != nil, tt.wantErr)
+			}
+
+			if err == nil && url == "" {
+				t.Errorf("expected non-empty URL, got empty string")
+			}
+		})
+	}
+}
+
+func TestValidateSuccess(t *testing.T) {
+	tests := []struct {
+		name   string
+		config *Config
+	}{
+		{
+			name: "Valid config with Addr and Exchange",
+			config: &Config{
+				Addr:     "localhost:5672",
+				Exchange: "ex",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := Validate(tt.config); err != nil {
+				t.Errorf("expected no error, got: %v", err)
+			}
+		})
+	}
+}
+
+func TestValidateFailure(t *testing.T) {
+	tests := []struct {
+		name   string
+		config *Config
+	}{
+		{
+			name:   "Nil config",
+			config: nil,
+		},
+		{
+			name:   "Missing Addr",
+			config: &Config{Exchange: "ex"},
+		},
+		{
+			name:   "Missing Exchange",
+			config: &Config{Addr: "localhost:5672"},
+		},
+		{
+			name:   "Empty Addr and Exchange",
+			config: &Config{Addr: " ", Exchange: " "},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := Validate(tt.config)
+			if err == nil {
+				t.Errorf("expected error for invalid config, got nil")
+			}
+		})
+	}
+}