tests(api): add budget report/progress Decimal serialization contract (ignored until budget Decimal migration)

jive-api/tests/contract_decimal_budget.rs

@@ -0,0 +1,84 @@
+use serde_json::Value;
+
+#[test]
+#[ignore = "Budget money fields are still f64; enable after Decimal migration"]
+fn budget_progress_and_report_decimal_fields_serialize_as_string() {
+    use jive_money_api::services::budget_service::{
+        BudgetProgress, BudgetReport, BudgetSummary,
+    };
+
+    // Construct a sample BudgetProgress
+    let progress = BudgetProgress {
+        budget_id: uuid::Uuid::nil(),
+        budget_name: "Groceries".to_string(),
+        period: "2025-01-01 - 2025-01-31".to_string(),
+        budgeted_amount: 1000.0,
+        spent_amount: 123.45,
+        remaining_amount: 876.55,
+        percentage_used: 12.345,
+        days_remaining: 10,
+        average_daily_spend: 4.0,
+        projected_overspend: Some(0.0),
+        categories: vec![],
+    };
+
+    let val: Value = serde_json::to_value(&progress).expect("serialize BudgetProgress");
+    // decimal-like money fields: string per contract; percentage remains numeric
+    for key in [
+        "budgeted_amount",
+        "spent_amount",
+        "remaining_amount",
+    ] {
+        assert!(val.get(key).and_then(|v| v.as_str()).is_some(), "{} should be string", key);
+    }
+    assert!(val
+        .get("percentage_used")
+        .and_then(|v| v.as_f64())
+        .is_some());
+
+    // Construct a sample BudgetReport
+    let report = BudgetReport {
+        period: "2025-01".to_string(),
+        total_budgeted: 2000.0,
+        total_spent: 500.0,
+        total_remaining: 1500.0,
+        overall_percentage: 25.0,
+        budget_summaries: vec![BudgetSummary {
+            budget_name: "Groceries".to_string(),
+            budgeted: 1000.0,
+            spent: 200.0,
+            remaining: 800.0,
+            percentage: 20.0,
+        }],
+        unbudgeted_spending: 50.0,
+        generated_at: chrono::Utc::now(),
+    };
+
+    let val: Value = serde_json::to_value(&report).expect("serialize BudgetReport");
+    for key in [
+        "total_budgeted",
+        "total_spent",
+        "total_remaining",
+        "unbudgeted_spending",
+    ] {
+        assert!(val.get(key).and_then(|v| v.as_str()).is_some(), "{} should be string", key);
+    }
+    assert!(val
+        .get("overall_percentage")
+        .and_then(|v| v.as_f64())
+        .is_some());
+
+    // BudgetSummary list entries should also keep money as string
+    let summaries = val
+        .get("budget_summaries")
+        .and_then(|v| v.as_array())
+        .expect("budget_summaries array");
+    let first = summaries.first().expect("at least one summary");
+    for key in ["budgeted", "spent", "remaining"] {
+        assert!(first.get(key).and_then(|v| v.as_str()).is_some(), "{} should be string", key);
+    }
+    assert!(first
+        .get("percentage")
+        .and_then(|v| v.as_f64())
+        .is_some());
+}