Add error path coverage for CronExpressionFormatter (#182)

* test: add error path coverage for CronExpressionFormatter

Added a new test case to cover the fallback code path when cron parsing throws an exception. This test ensures the formatting correctly defaults to returning "Raw: <schedule>" when an invalid string like '0 12 1 15 *' or '0 9 * * 8' is passed.

It also introduces mockk integration to mock android.util.Log which prevents RuntimeExceptions from being thrown during local JUnit tests when logging errors in the catch block.

* test: add error path coverage for CronExpressionFormatter and fix ktlint issues

Added a new test case to cover the fallback code path when cron parsing throws an exception. This test ensures the formatting correctly defaults to returning "Raw: <schedule>" when an invalid string like '0 12 1 15 *' or '0 9 * * 8' is passed.

It also introduces mockk integration to mock android.util.Log which prevents RuntimeExceptions from being thrown during local JUnit tests when logging errors in the catch block.

Also removed trailing whitespace and an empty line at the start of the class to fix ktlint checking in CI.

app/src/test/java/com/m57/hermescontrol/util/CronExpressionFormatterTest.kt

@@ -1,9 +1,26 @@
 package com.m57.hermescontrol.util
 
+import android.util.Log
+import io.mockk.every
+import io.mockk.mockkStatic
+import io.mockk.unmockkAll
+import org.junit.After
 import org.junit.Assert.assertEquals
+import org.junit.Before
 import org.junit.Test
 
 class CronExpressionFormatterTest {
+    @Before
+    fun setup() {
+        mockkStatic(Log::class)
+        every { Log.w(any(), any<String>(), any()) } returns 0
+    }
+
+    @After
+    fun teardown() {
+        unmockkAll()
+    }
+
     @Test
     fun testCronToHumanReadable() {
         assertEquals("At 09:00 and 21:00 every day", CronExpressionFormatter.cronToHumanReadable("0 9,21 * * *"))
@@ -22,4 +39,13 @@ class CronExpressionFormatterTest {
         assertEquals("invalid cron string", CronExpressionFormatter.cronToHumanReadable("invalid cron string"))
         assertEquals("0 9 * *", CronExpressionFormatter.cronToHumanReadable("0 9 * *"))
     }
+
+    @Test
+    fun testExceptionFallback() {
+        // This will cause an IndexOutOfBoundsException because 15 is out of bounds for monthNames
+        assertEquals("Raw: 0 12 1 15 *", CronExpressionFormatter.cronToHumanReadable("0 12 1 15 *"))
+
+        // This will cause an IndexOutOfBoundsException because 8 is out of bounds for dowNames
+        assertEquals("Raw: 0 9 * * 8", CronExpressionFormatter.cronToHumanReadable("0 9 * * 8"))
+    }
 }