Adding test and bench example

.golangci.yaml

@@ -2,3 +2,6 @@ issues:
   exclude-rules:
     - path: frontend/embed.go
       text: "pattern build/\\*: no matching files found"
+    - path: _test.go
+      linters:
+        - errcheck

internal/monero/prober_test.go

@@ -0,0 +1,84 @@
+package monero
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"testing"
+	"xmr-remote-nodes/internal/config"
+	"xmr-remote-nodes/internal/database"
+)
+
+var testMySQL = true
+
+func init() {
+	// load test db config from OS environment variable
+	//
+	// Example:
+	// TEST_DB_HOST=127.0.0.1 \
+	// TEST_DB_PORT=3306 \
+	// TEST_DB_USER=testuser \
+	// TEST_DB_PASSWORD=testpass \
+	// TEST_DB_NAME=testdb go test ./... -v
+	//
+	// To run benchmark only, add `-bench=. -run=^#` to the `go test` command
+	config.DBCfg().Host = os.Getenv("TEST_DB_HOST")
+	config.DBCfg().Port, _ = strconv.Atoi(os.Getenv("TEST_DB_PORT"))
+	config.DBCfg().User = os.Getenv("TEST_DB_USER")
+	config.DBCfg().Password = os.Getenv("TEST_DB_PASSWORD")
+	config.DBCfg().Name = os.Getenv("TEST_DB_NAME")
+
+	if err := database.ConnectDB(); err != nil {
+		testMySQL = false
+	}
+}
+
+// TODO: Add database test table and then clean it up
+
+func TestProberRepo_CheckApi(t *testing.T) {
+	if !testMySQL {
+		fmt.Println("Skip test, not connected to database")
+		t.Skip("Skip test, not connected to database")
+	}
+	tests := []struct {
+		name    string
+		apiKey  string
+		want    Prober
+		wantErr bool
+	}{
+		{
+			name:    "Empty key",
+			apiKey:  "",
+			want:    Prober{},
+			wantErr: true,
+		},
+		{
+			name:    "Invalid key",
+			apiKey:  "invalid",
+			want:    Prober{},
+			wantErr: true,
+		},
+	}
+
+	repo := NewProber()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := repo.CheckApi(tt.apiKey)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ProberRepo.CheckApi() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+		})
+	}
+}
+
+func BenchmarkProberRepo_CheckApi(b *testing.B) {
+	if !testMySQL {
+		fmt.Println("Skip bench, not connected to database")
+		b.Skip("Skip bench, not connected to database")
+	}
+	repo := NewProber()
+	for i := 0; i < b.N; i++ {
+		repo.CheckApi("")
+	}
+}