fix: add back single factory test

Author: RealAnna

otelcol/command_components_test.go

@@ -267,6 +267,13 @@ func TestSortFactoriesByType(t *testing.T) {
 			factories: map[component.Type]mockFactory{},
 			wantTypes: []string{},
 		},
+		{
+			name: "with a single factory",
+			factories: map[component.Type]mockFactory{
+				component.MustNewType("processor"): newMockFactory("processor"),
+			},
+			wantTypes: []string{"processor"},
+		},
 		{
 			name: "with canonical factories only (sorted by type)",
 			factories: map[component.Type]mockFactory{