Adapt tests to rebased reference handling

src/benchmark/relative_speed.rs

@@ -222,7 +222,7 @@ fn reference_identity_distinguishes_equal_results() {
 fn reference_ratios_handle_zero_times() {
     let mut results = vec![create_result("reference", 2.0), create_result("zero", 0.0)];
     for result in &mut results {
-        let measurement = result.measurements.measurements[0];
+        let measurement = result.measurements.measurements[0].clone();
         result.measurements.measurements.push(measurement);
     }
     let entries = compute_relative_speeds(&results, &results[0], SortOrder::Command);

src/export/json.rs

@@ -59,7 +59,7 @@ fn test_json_optional_memory() {
             ..BenchmarkResult::default()
         };
         let output = JsonExporter::default()
-            .serialize(&[result], None, SortOrder::Command)
+            .serialize(&[result], None, SortOrder::Command, None)
             .unwrap();
         let actual: serde_json::Value = serde_json::from_slice(&output).unwrap();
         let mut expected = json!({

tests/integration_tests.rs

@@ -940,7 +940,7 @@ fn selects_reference_with_parameterized_prepare() {
     assert_eq!(
         results
             .iter()
-            .map(|result| result["parameters"]["delay"].as_str().unwrap())
+            .map(|result| result["parameters"]["delay"]["value"].as_str().unwrap())
             .collect::<Vec<_>>(),
         ["0.2", "0.4", "0.6"]
     );