refactor: Break core package into multiple packages under config/endpoint (#759)

* refactor: Partially break core package into dns, result and ssh packages

* refactor: Move core package to config/endpoint

* refactor: Fix warning about overlapping imported package name with endpoint variable

* refactor: Rename EndpointStatus to Status

* refactor: Merge result pkg back into endpoint pkg, because it makes more sense

* refactor: Rename parameter r to result in Condition.evaluate

* refactor: Rename parameter r to result

* refactor: Revert accidental change to endpoint.TypeDNS

* refactor: Rename parameter r to result

* refactor: Merge util package into endpoint package

* refactor: Rename parameter r to result

config/endpoint/ui/ui_test.go

@@ -0,0 +1,53 @@
+package ui
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestValidateAndSetDefaults(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr error
+	}{
+		{
+			name: "with-valid-config",
+			config: &Config{
+				Badge: &Badge{
+					ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 300, 500, 750}},
+				},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "with-invalid-threshold-length",
+			config: &Config{
+				Badge: &Badge{
+					ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 300, 500}},
+				},
+			},
+			wantErr: ErrInvalidBadgeResponseTimeConfig,
+		},
+		{
+			name: "with-invalid-thresholds-order",
+			config: &Config{
+				Badge: &Badge{ResponseTime: &ResponseTime{Thresholds: []int{50, 200, 500, 300, 750}}},
+			},
+			wantErr: ErrInvalidBadgeResponseTimeConfig,
+		},
+		{
+			name:    "with-no-badge-configured", // should give default badge cfg
+			config:  &Config{},
+			wantErr: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := tt.config.ValidateAndSetDefaults(); !errors.Is(err, tt.wantErr) {
+				t.Errorf("Expected error %v, got %v", tt.wantErr, err)
+			}
+		})
+	}
+}