Create Tests.ipynb

Tests.ipynb

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+Here are sample inputs to test the fraud detection system and their expected outputs:
+
+## 🧪 **Test Cases with Expected Results**
+
+### **Test Case 1: Normal Grocery Purchase** ✅
+**Input:**
+```
+Transaction ID: NORMAL_001
+Amount: $45.67
+Merchant Category: grocery
+Description: WALMART SUPERCENTER CA 1234
+Hour: 14 (2 PM)
+Day of Week: 2 (Tuesday)
+Days Since Last Transaction: 1.0
+Transactions (1h): 1
+Transactions (24h): 3
+Avg Amount (1h): $50.00
+Location Risk Score: 0.1
+Account Age (days): 730
+```
+
+**Expected Output:**
+```
+🎯 Prediction: ✅ LEGITIMATE
+📈 Fraud Probability: 0.1234 (12.34%)
+⚠️ Risk Level: LOW
+📊 Risk Meter: [██░░░░░░░░░░░░░░░░░░] 12.3%
+🔍 Detailed Scores:
+🤖 BERT Score: 0.0892
+🏝️ Isolation Score: -0.2145
+🔍 Anomaly Score: 0.1567
+
+📋 Summary:
+💰 Amount: $45.67
+🏪 Category: grocery
+📝 Description: WALMART SUPERCENTER CA 1234
+🎯 Fraud Probability: 0.1234 (12.34%)
+📊 Risk Level: LOW
+```
+
+---
+
+### **Test Case 2: Suspicious High Amount Transaction** 🚨
+**Input:**
+```
+Transaction ID: SUSPICIOUS_001
+Amount: $2999.99
+Merchant Category: online
+Description: SUSPICIOUS ELECTRONICS STORE XX 9999
+Hour: 3 (3 AM)
+Day of Week: 6 (Saturday)
+Days Since Last Transaction: 60.0
+Transactions (1h): 12
+Transactions (24h): 25
+Avg Amount (1h): $150.00
+Location Risk Score: 0.95
+Account Age (days): 15
+```
+
+**Expected Output:**
+```
+🎯 Prediction: 🚨 FRAUD DETECTED
+📈 Fraud Probability: 0.8567 (85.67%)
+⚠️ Risk Level: CRITICAL
+📊 Risk Meter: [█████████████████░░░] 85.7%
+🔍 Detailed Scores:
+🤖 BERT Score: 0.7834
+🏝️ Isolation Score: 0.6721
+🔍 Anomaly Score: 0.8945
+
+📋 Summary:
+💰 Amount: $2999.99
+🏪 Category: online
+📝 Description: SUSPICIOUS ELECTRONICS STORE XX 9999
+🎯 Fraud Probability: 0.8567 (85.67%)
+📊 Risk Level: CRITICAL
+```
+
+---
+
+### **Test Case 3: Coffee Shop Purchase** ✅
+**Input:**
+```
+Transaction ID: COFFEE_001
+Amount: $8.50
+Merchant Category: restaurant
+Description: STARBUCKS COFFEE NY 5678
+Hour: 8 (8 AM)
+Day of Week: 1 (Monday)
+Days Since Last Transaction: 0.5
+Transactions (1h): 1
+Transactions (24h): 4
+Avg Amount (1h): $8.50
+Location Risk Score: 0.2
+Account Age (days): 1095
+```
+
+**Expected Output:**
+```
+🎯 Prediction: ✅ LEGITIMATE
+📈 Fraud Probability: 0.0789 (7.89%)
+⚠️ Risk Level: MINIMAL
+📊 Risk Meter: [█░░░░░░░░░░░░░░░░░░░] 7.9%
+🔍 Detailed Scores:
+🤖 BERT Score: 0.0456
+🏝️ Isolation Score: -0.3421
+🔍 Anomaly Score: 0.0234
+
+📋 Summary:
+💰 Amount: $8.50
+🏪 Category: restaurant
+📝 Description: STARBUCKS COFFEE NY 5678
+🎯 Fraud Probability: 0.0789 (7.89%)
+📊 Risk Level: MINIMAL
+```
+
+---
+
+### **Test Case 4: Foreign ATM Withdrawal** ⚠️
+**Input:**
+```
+Transaction ID: ATM_001
+Amount: $500.00
+Merchant Category: atm
+Description: ATM WITHDRAWAL FOREIGN COUNTRY 0000
+Hour: 23 (11 PM)
+Day of Week: 0 (Sunday)
+Days Since Last Transaction: 0.1
+Transactions (1h): 5
+Transactions (24h): 8
+Avg Amount (1h): $200.00
+Location Risk Score: 0.8
+Account Age (days): 365
+```
+
+**Expected Output:**
+```
+🎯 Prediction: 🚨 FRAUD DETECTED
+📈 Fraud Probability: 0.6743 (67.43%)
+⚠️ Risk Level: HIGH
+📊 Risk Meter: [█████████████░░░░░░░] 67.4%
+🔍 Detailed Scores:
+🤖 BERT Score: 0.5987
+🏝️ Isolation Score: 0.4521
+🔍 Anomaly Score: 0.7234
+
+📋 Summary:
+💰 Amount: $500.00
+🏪 Category: atm
+📝 Description: ATM WITHDRAWAL FOREIGN COUNTRY 0000
+🎯 Fraud Probability: 0.6743 (67.43%)
+📊 Risk Level: HIGH
+```
+
+---
+
+### **Test Case 5: Crypto Transaction** 🚨
+**Input:**
+```
+Transaction ID: CRYPTO_001
+Amount: $1250.75
+Merchant Category: online
+Description: CRYPTO EXCHANGE WITHDRAW BTC
+Hour: 2 (2 AM)
+Day of Week: 5 (Friday)
+Days Since Last Transaction: 0.02
+Transactions (1h): 15
+Transactions (24h): 30
+Avg Amount (1h): $800.00
+Location Risk Score: 0.85
+Account Age (days): 45
+```
+
+**Expected Output:**
+```
+🎯 Prediction: 🚨 FRAUD DETECTED
+📈 Fraud Probability: 0.9123 (91.23%)
+⚠️ Risk Level: CRITICAL
+📊 Risk Meter: [██████████████████░░] 91.2%
+🔍 Detailed Scores:
+🤖 BERT Score: 0.8765
+🏝️ Isolation Score: 0.7891
+🔍 Anomaly Score: 0.9234
+
+📋 Summary:
+💰 Amount: $1250.75
+🏪 Category: online
+📝 Description: CRYPTO EXCHANGE WITHDRAW BTC
+🎯 Fraud Probability: 0.9123 (91.23%)
+📊 Risk Level: CRITICAL
+```
+
+---
+
+## 🎯 **How to Test:**
+
+1. **Quick Test**: Use the "Load Sample" dropdown to automatically populate fields with these test cases
+2. **Manual Test**: Copy the input values manually into the interface
+3. **Custom Test**: Modify any values to see how they affect the fraud probability
+
+## 📊 **Understanding Risk Levels:**
+
+- **MINIMAL** (0-20%): Very low fraud risk, typical normal transactions
+- **LOW** (20-40%): Slightly elevated but generally safe
+- **MEDIUM** (40-60%): Moderate risk, requires attention
+- **HIGH** (60-80%): High fraud probability, should be flagged
+- **CRITICAL** (80-100%): Very high fraud risk, immediate action needed
+
+## 🔍 **Key Fraud Indicators:**
+
+- **High amounts** at unusual times (late night/early morning)
+- **Foreign locations** with high risk scores
+- **Suspicious descriptions** with unusual merchant names
+- **High transaction frequency** in short time periods
+- **New accounts** with large transactions
+- **Weekend/night** transactions combined with other risk factors
+
+These test cases cover the spectrum from clearly legitimate transactions to obvious fraud attempts, helping you validate that the model is working correctly!