init

tests/test_converter.py

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+import pytest
+from selenium import webdriver
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.webdriver.support import expected_conditions as EC
+from selenium.webdriver.common.keys import Keys
+import time
+
+@pytest.fixture
+def driver():
+    """Set up Chrome driver with options"""
+    options = webdriver.ChromeOptions()
+    options.add_argument('--headless')
+    options.add_argument('--no-sandbox')
+    options.add_argument('--disable-dev-shm-usage')
+    driver = webdriver.Chrome(options=options)
+    driver.implicitly_wait(2)
+    yield driver
+    driver.quit()
+
+@pytest.fixture
+def converter_page(driver, dev_server):
+    """Navigate to currency converter page"""
+    driver.get(f"{dev_server}")
+    
+    # Wait for page to load and JavaScript to populate navigation
+    from selenium.webdriver.support.ui import WebDriverWait
+    from selenium.webdriver.support import expected_conditions as EC
+    from selenium.webdriver.common.by import By
+    
+    WebDriverWait(driver, 10).until(
+        EC.presence_of_element_located((By.CLASS_NAME, "sidenav"))
+    )
+    # Wait for JavaScript to populate the navigation with calculator links
+    WebDriverWait(driver, 10).until(
+        EC.presence_of_element_located((By.XPATH, "//a[contains(text(), 'Currency Converter')]"))
+    )
+    
+    # Click on Currency Converter
+    currency_btn = driver.find_element(By.XPATH, "//a[contains(text(), 'Currency Converter')]")
+    currency_btn.click()
+    
+    # Wait for currency converter to load
+    WebDriverWait(driver, 10).until(
+        EC.presence_of_element_located((By.NAME, "amount"))
+    )
+    
+    return driver
+
+class TestCurrencyConverter:
+    """Test the Currency Converter functionality"""
+    
+    def _ensure_calculation(self, converter_page):
+        """Helper to trigger calculation and wait for result"""
+        # Trigger calculation by sending TAB to the amount input
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.send_keys(Keys.TAB)
+        
+        # Wait for calculation to complete
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.CLASS_NAME, "result"))
+        )
+        
+        # Wait a bit more for the currency converter to fully load and replace the old result
+        time.sleep(1)
+    
+    def _get_currency_result(self, converter_page):
+        """Helper to get the correct currency result element"""
+        # Find all result elements and get the one that's actually visible/contains currency content
+        result_elements = converter_page.find_elements(By.CLASS_NAME, "result")
+        
+        # Look for the result element that contains currency-related content
+        currency_result = None
+        for elem in result_elements:
+            html = elem.get_attribute('innerHTML')
+            if 'USD' in html or 'EUR' in html or 'GBP' in html or 'Currency' in html or 'conversion' in html.lower():
+                currency_result = elem
+                break
+        
+        if not currency_result:
+            # If no currency result found, use the last result element (most recent)
+            currency_result = result_elements[-1]
+        
+        return currency_result
+    
+    def test_page_loads_with_default_values(self, converter_page):
+        """Test that the page loads with default values and shows initial calculation"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result contains expected content
+        assert "USD" in result.text
+        assert "EUR" in result.text
+        assert "100" in result.text
+    
+    def test_currency_selection_works(self, converter_page):
+        """Test that currency selection works and updates calculation"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Change from currency to GBP using Select Lite
+        from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+        from_button.click()
+        
+        # Wait for and click on GBP option
+        gbp_option = WebDriverWait(converter_page, 10).until(
+            EC.element_to_be_clickable((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'GBP')]"))
+        )
+        gbp_option.click()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result contains GBP
+        assert "GBP" in result.text
+    
+    def test_manual_rate_input_updates_calculation(self, converter_page):
+        """Test that manual rate input updates calculation immediately"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Find and update manual rate input
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("2.0")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows the custom rate
+        assert "2.0" in result.text
+        assert "Custom rate" in result.text
+    
+    def test_manual_rate_overrides_market_rates(self, converter_page):
+        """Test that manual rate overrides fetched market rates"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Set a manual rate
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("1.5")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows the custom rate
+        assert "1.5" in result.text
+        assert "Custom rate" in result.text
+    
+    def test_currency_switching_clears_manual_rate(self, converter_page):
+        """Test that switching currencies clears manual rate input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Set a manual rate
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("1.5")
+        
+        # Change to currency using Select Lite
+        from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+        from_button.click()
+        
+        # Wait for and click on GBP option
+        gbp_option = WebDriverWait(converter_page, 10).until(
+            EC.element_to_be_clickable((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'GBP')]"))
+        )
+        gbp_option.click()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows GBP and uses static rates (not custom rate)
+        assert "GBP" in result.text
+        assert "Static rates" in result.text
+    
+    def test_fetch_rates_updates_manual_rate(self, converter_page):
+        """Test that fetching rates updates the manual rate input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Set a manual rate first
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("1.0")
+        
+        # Click the fetch rates button
+        fetch_button = converter_page.find_element(By.XPATH, "//button[contains(text(), 'Update Exchange Rates')]")
+        # Use JavaScript to click to avoid interception
+        converter_page.execute_script("arguments[0].click();", fetch_button)
+        
+        # Wait for the status to show success
+        WebDriverWait(converter_page, 15).until(
+            EC.text_to_be_present_in_element((By.CLASS_NAME, "status"), "Rates updated successfully!")
+        )
+        
+        # Clear the manual rate so it will use the fetched rates
+        manual_rate_input.clear()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows live rates (not custom rate)
+        assert "Live rates" in result.text
+    
+    def test_same_currency_conversion(self, converter_page):
+        """Test conversion when from and to currencies are the same"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Change from currency to EUR using Select Lite (since to is already EUR)
+        from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+        from_button.click()
+        
+        # Wait for and click on EUR option
+        eur_option = WebDriverWait(converter_page, 10).until(
+            EC.element_to_be_clickable((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'EUR')]"))
+        )
+        eur_option.click()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows same currency message
+        assert "Same currency - no conversion needed" in result.text
+        assert "100.00 EUR" in result.text
+    
+    def test_amount_input_updates_calculation(self, converter_page):
+        """Test that changing amount updates calculation immediately"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Change amount
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("50")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows the new amount
+        assert "50" in result.text
+    
+    def test_negative_amount_handling(self, converter_page):
+        """Test that negative amounts are handled appropriately"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Try to enter negative amount
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("-100")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows the validation message
+        assert "Enter a positive amount to convert" in result.text
+    
+    def test_zero_amount_handling(self, converter_page):
+        """Test that zero amounts are handled appropriately"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Try to enter zero amount
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("0")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows the validation message
+        assert "Enter a positive amount to convert" in result.text
+    
+    def test_status_message_behavior(self, converter_page):
+        """Test that status messages appear and disappear appropriately"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Click the fetch rates button to trigger a status message
+        fetch_button = converter_page.find_element(By.XPATH, "//button[contains(text(), 'Update Exchange Rates')]")
+        # Use JavaScript to click to avoid interception
+        converter_page.execute_script("arguments[0].click();", fetch_button)
+        
+        # Wait for the status to show success
+        WebDriverWait(converter_page, 15).until(
+            EC.text_to_be_present_in_element((By.CLASS_NAME, "status"), "Rates updated successfully!")
+        )
+        
+        # Wait for the status message to disappear (should auto-hide after 1.5 seconds)
+        time.sleep(2)
+        
+        # Check that the status element is either hidden or empty
+        status = converter_page.find_element(By.CLASS_NAME, "status")
+        assert status.text.strip() == "" or status.get_attribute("style").find("display: none") != -1
+    
+    def test_select_lite_search_functionality(self, converter_page):
+        """Test that Select Lite search works for currency selection"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Click on the from currency Select Lite button
+        from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+        from_button.click()
+        
+        # Wait for the dropdown to open
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.CLASS_NAME, "select-lite__menu"))
+        )
+        
+        # Type 'g' to search for GBP
+        from_button.send_keys("g")
+        
+        # Wait for and verify that GBP option is highlighted/filtered
+        gbp_option = WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'GBP')]"))
+        )
+        
+        # Click on GBP option
+        gbp_option.click()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Check that the result shows GBP
+        assert "GBP" in result.text
+
+class TestCurrencyConverterEdgeCases:
+    """Test edge cases and error conditions for the Currency Converter"""
+    
+    def _ensure_calculation(self, converter_page):
+        """Helper to trigger calculation and wait for result"""
+        # Trigger calculation by sending TAB to the amount input
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.send_keys(Keys.TAB)
+        
+        # Wait for calculation to complete
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.CLASS_NAME, "result"))
+        )
+        
+        # Wait a bit more for the currency converter to fully load and replace the old result
+        time.sleep(1)
+    
+    def _get_currency_result(self, converter_page):
+        """Helper to get the correct currency result element"""
+        # Find all result elements and get the one that's actually visible/contains currency content
+        result_elements = converter_page.find_elements(By.CLASS_NAME, "result")
+        
+        # Look for the result element that contains currency-related content
+        currency_result = None
+        for elem in result_elements:
+            html = elem.get_attribute('innerHTML')
+            if 'USD' in html or 'EUR' in html or 'GBP' in html or 'JPY' in html or 'Currency' in html or 'conversion' in html.lower():
+                currency_result = elem
+                break
+        
+        if not currency_result:
+            # If no currency result found, use the last result element (most recent)
+            currency_result = result_elements[-1]
+        
+        return currency_result
+    
+    def test_extremely_large_amounts(self, converter_page):
+        """Test handling of extremely large amounts (overflow protection)"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with a very large number
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("999999999999999999")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle large numbers gracefully (not crash or show error)
+        assert result.text.strip() != ""
+        assert "Unable to calculate conversion" not in result.text
+    
+    def test_extremely_small_amounts(self, converter_page):
+        """Test handling of extremely small amounts (precision limits)"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with a very small number
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("0.0000000001")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle small numbers gracefully
+        assert result.text.strip() != ""
+        assert "Unable to calculate conversion" not in result.text
+    
+    def test_decimal_precision_limits(self, converter_page):
+        """Test handling of many decimal places"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with many decimal places
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("100.12345678901234567890")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle precision gracefully
+        assert result.text.strip() != ""
+        assert "100.12" in result.text  # Should round appropriately
+    
+    def test_empty_amount_input(self, converter_page):
+        """Test handling of empty amount input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Clear amount input completely
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        
+        # Send a TAB to trigger calculation
+        amount_input.send_keys(Keys.TAB)
+        
+        # Wait for calculation to complete
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.CLASS_NAME, "result"))
+        )
+        
+        # Wait a bit more for the result to update
+        time.sleep(1)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle empty input gracefully (either show validation message or fall back to previous result)
+        assert result.text.strip() != ""
+        # Note: The currency converter may not properly validate empty input, so we just ensure it doesn't crash
+    
+    def test_whitespace_only_input(self, converter_page):
+        """Test handling of whitespace-only input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with whitespace
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("   ")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle whitespace gracefully
+        assert result.text.strip() != ""
+    
+    def test_manual_rate_edge_cases(self, converter_page):
+        """Test edge cases for manual rate input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with zero manual rate
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("0")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should fall back to market/static rates when manual rate is 0
+        assert "Static rates" in result.text or "Live rates" in result.text
+        
+        # Test with negative manual rate
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("-1.5")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should fall back to market/static rates when manual rate is negative
+        assert "Static rates" in result.text or "Live rates" in result.text
+    
+    def test_extremely_small_manual_rate(self, converter_page):
+        """Test handling of extremely small manual rates"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with very small rate
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("0.0000000001")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle small rates gracefully
+        assert result.text.strip() != ""
+        assert "Custom rate" in result.text
+    
+    def test_extremely_large_manual_rate(self, converter_page):
+        """Test handling of extremely large manual rates"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with very large rate
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("999999999999999999")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle large rates gracefully
+        assert result.text.strip() != ""
+        assert "Custom rate" in result.text
+    
+    def test_rapid_currency_switching(self, converter_page):
+        """Test rapid switching between currencies to ensure state consistency"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Rapidly switch currencies multiple times
+        for i in range(3):
+            # Change from currency using JavaScript to avoid interception
+            from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+            converter_page.execute_script("arguments[0].click();", from_button)
+            
+            # Wait for dropdown to open
+            WebDriverWait(converter_page, 10).until(
+                EC.presence_of_element_located((By.CLASS_NAME, "select-lite__menu"))
+            )
+            
+            # Wait for and click on GBP option
+            gbp_option = WebDriverWait(converter_page, 10).until(
+                EC.element_to_be_clickable((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'GBP')]"))
+            )
+            converter_page.execute_script("arguments[0].click();", gbp_option)
+            
+            # Wait for selection to complete
+            time.sleep(0.5)
+            
+            # Change back to USD
+            from_button = converter_page.find_element(By.CSS_SELECTOR, '[name="from"] + .select-lite__button')
+            converter_page.execute_script("arguments[0].click();", from_button)
+            
+            # Wait for dropdown to open
+            WebDriverWait(converter_page, 10).until(
+                EC.presence_of_element_located((By.CLASS_NAME, "select-lite__menu"))
+            )
+            
+            usd_option = WebDriverWait(converter_page, 10).until(
+                EC.element_to_be_clickable((By.XPATH, "//div[contains(@class, 'select-lite__option') and contains(text(), 'USD')]"))
+            )
+            converter_page.execute_script("arguments[0].click();", usd_option)
+            
+            # Wait for selection to complete
+            time.sleep(0.5)
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should still work correctly after rapid switching
+        assert result.text.strip() != ""
+        assert "USD" in result.text
+        assert "EUR" in result.text
+    
+    def test_rapid_amount_changes(self, converter_page):
+        """Test rapid changes to amount input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Rapidly change amounts
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        for amount in ["100", "200", "50", "75", "100"]:
+            amount_input.clear()
+            amount_input.send_keys(amount)
+            time.sleep(0.1)
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should show the final amount correctly
+        assert result.text.strip() != ""
+        assert "100" in result.text
+    
+    def test_concurrent_rate_fetching(self, converter_page):
+        """Test multiple rapid clicks on fetch rates button"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Click fetch rates button multiple times rapidly
+        fetch_button = converter_page.find_element(By.XPATH, "//button[contains(text(), 'Update Exchange Rates')]")
+        for _ in range(3):
+            converter_page.execute_script("arguments[0].click();", fetch_button)
+            time.sleep(0.1)
+        
+        # Wait for any status message
+        try:
+            WebDriverWait(converter_page, 15).until(
+                EC.presence_of_element_located((By.CLASS_NAME, "status"))
+            )
+        except:
+            pass  # Status might not appear if requests are cancelled
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should still work correctly after multiple clicks
+        assert result.text.strip() != ""
+    
+    def test_invalid_manual_rate_input(self, converter_page):
+        """Test handling of invalid manual rate input"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with invalid input (letters)
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("abc")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should fall back to market/static rates when manual rate is invalid
+        assert "Static rates" in result.text or "Live rates" in result.text
+    
+    def test_manual_rate_precision_limits(self, converter_page):
+        """Test handling of manual rate with many decimal places"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with many decimal places
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("1.234567890123456789")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle precision gracefully
+        assert result.text.strip() != ""
+        assert "Custom rate" in result.text
+        assert "1.2346" in result.text  # Should round appropriately
+    
+    def test_cache_expiration_edge_case(self, converter_page):
+        """Test behavior when cache is about to expire"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # This test would require mocking time, but we can test the basic functionality
+        # by ensuring the cache duration logic doesn't break normal operation
+        
+        # Click fetch rates button
+        fetch_button = converter_page.find_element(By.XPATH, "//button[contains(text(), 'Update Exchange Rates')]")
+        converter_page.execute_script("arguments[0].click();", fetch_button)
+        
+        # Wait for status to show success
+        try:
+            WebDriverWait(converter_page, 15).until(
+                EC.text_to_be_present_in_element((By.CLASS_NAME, "status"), "Rates updated successfully!")
+            )
+        except:
+            pass  # API might fail, that's okay for this test
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should still work regardless of cache status
+        assert result.text.strip() != ""
+    
+    def test_currency_pair_edge_cases(self, converter_page):
+        """Test edge cases with specific currency pairs"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Test with a very small amount to test precision handling
+        amount_input = converter_page.find_element(By.NAME, "amount")
+        amount_input.clear()
+        amount_input.send_keys("0.01")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should handle small amounts correctly
+        assert result.text.strip() != ""
+        assert "0.01" in result.text  # Should show the small amount
+        assert "USD" in result.text
+        assert "EUR" in result.text
+    
+    def test_empty_manual_rate_after_setting(self, converter_page):
+        """Test behavior when manual rate is cleared after being set"""
+        # Wait for the page to load
+        WebDriverWait(converter_page, 10).until(
+            EC.presence_of_element_located((By.NAME, "amount"))
+        )
+        
+        # Set a manual rate first
+        manual_rate_input = converter_page.find_element(By.NAME, "manualRate")
+        manual_rate_input.clear()
+        manual_rate_input.send_keys("2.0")
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should show custom rate
+        assert "Custom rate" in result.text
+        
+        # Now clear the manual rate
+        manual_rate_input.clear()
+        
+        # Ensure calculation is triggered
+        self._ensure_calculation(converter_page)
+        
+        # Get the currency result element
+        result = self._get_currency_result(converter_page)
+        
+        # Should fall back to market/static rates
+        assert "Static rates" in result.text or "Live rates" in result.text
+        assert "Custom rate" not in result.text
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])