added tests for duplicate instace in localconfig

Signed-off-by: syedowais312 <syedowais312sf@gmail.com>

Author: Syedowais312

pkg/config/localconfig_test.go

@@ -0,0 +1,56 @@
+package config
+
+import (
+	"testing"
+)
+
+func TestRemoveInstance_ByContainerID(t *testing.T) {
+	localConfig := &LocalConfig{
+		Instances: []Instance{
+			{Name: "microcks", ContainerID: "old-id-123", Status: "Running", Port: "8585"},
+			{Name: "staging", ContainerID: "staging-id-456", Status: "Running", Port: "8586"},
+		},
+	}
+
+	removed := localConfig.RemoveInstance("old-id-123")
+
+	if !removed {
+		t.Error("expected RemoveInstance to return true")
+	}
+	// staging should still be there
+	if len(localConfig.Instances) != 1 {
+		t.Errorf("expected 1 instance remaining, got %d", len(localConfig.Instances))
+	}
+	if localConfig.Instances[0].ContainerID != "staging-id-456" {
+		t.Errorf("expected staging instance to remain, got %s", localConfig.Instances[0].ContainerID)
+	}
+}
+
+func TestRemoveInstance_NoDuplicatesAfterRecreate(t *testing.T) {
+	localConfig := &LocalConfig{
+		Instances: []Instance{
+			{Name: "microcks", ContainerID: "old-id-123", Status: "Running", Port: "8585"},
+			{Name: "staging", ContainerID: "staging-id-456", Status: "Running", Port: "8586"},
+		},
+	}
+
+	localConfig.RemoveInstance("old-id-123")
+
+	localConfig.UpsertInstance(Instance{
+		Name:        "microcks",
+		ContainerID: "new-id-789",
+		Status:      "Running",
+		Port:        "8585",
+	})
+
+	// staging + recreated microcks = 2, no duplicates
+	if len(localConfig.Instances) != 2 {
+		t.Errorf("expected 2 instances, got %d — duplicate entries present", len(localConfig.Instances))
+	}
+	// verify microcks has new ID
+	for _, i := range localConfig.Instances {
+		if i.Name == "microcks" && i.ContainerID != "new-id-789" {
+			t.Errorf("expected new-id-789, got %s", i.ContainerID)
+		}
+	}
+}