test(sidecar): pin pressKey keycode mapping and unknown-key rejection

sidecar/src/test/kotlin/dev/sanderling/sidecar/InputTextTest.kt

@@ -2,10 +2,33 @@ package dev.sanderling.sidecar
 
 import org.junit.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
 import kotlin.test.assertTrue
 
 class InputTextTest {
 
+    // A logical key name must map to the right Android keycode; a typo'd table
+    // entry would silently dispatch the wrong key (e.g. 'back' issuing HOME).
+    @Test fun pressKeyDispatchesMappedKeycode() {
+        val cases = mapOf(
+            "back" to "KEYCODE_BACK",
+            "enter" to "KEYCODE_ENTER",
+            "up" to "KEYCODE_DPAD_UP",
+        )
+        for ((key, keycode) in cases) {
+            val commands = mutableListOf<List<String>>()
+            StubDriverBackend("android") { commands.add(it) }.pressKey(key)
+            assertEquals(listOf(listOf("shell", "input", "keyevent", keycode)), commands, key)
+        }
+    }
+
+    @Test fun pressKeyRejectsUnknownKeyInsteadOfSilentlyDoingNothing() {
+        val commands = mutableListOf<List<String>>()
+        val backend = StubDriverBackend("android") { commands.add(it) }
+        assertFailsWith<IllegalArgumentException> { backend.pressKey("zorp") }
+        assertTrue(commands.isEmpty())
+    }
+
     @Test fun inputTextTypesAtCursorWithoutClearing() {
         val commands = mutableListOf<List<String>>()
         val backend = StubDriverBackend("android") { commands.add(it) }