test: Add unit tests for Android KeyEvent (#2147)

Author: valfirst

src/test/java/io/appium/java_client/android/nativekey/KeyEventTest.java

@@ -0,0 +1,48 @@
+package io.appium.java_client.android.nativekey;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class KeyEventTest {
+
+    @Test
+    void shouldThrowExceptionWhenKeyCodeIsNotSet() {
+        var keyEvent = new KeyEvent();
+
+        var exception = assertThrows(IllegalStateException.class, keyEvent::build);
+
+        assertEquals("The key code must be set", exception.getMessage());
+    }
+
+    @Test
+    void shouldBuildMinimalParameters() {
+        var keyEvent = new KeyEvent().withKey(AndroidKey.A);
+
+        Map<String, Object> params = keyEvent.build();
+
+        assertParameters(params, AndroidKey.A, null, null);
+    }
+
+    @Test
+    void shouldBuildFullParameters() {
+        var keyEvent = new KeyEvent()
+                .withKey(AndroidKey.A)
+                .withMetaModifier(KeyEventMetaModifier.CAP_LOCKED)
+                .withFlag(KeyEventFlag.KEEP_TOUCH_MODE);
+
+        Map<String, Object> params = keyEvent.build();
+
+        assertParameters(params, AndroidKey.A, KeyEventMetaModifier.CAP_LOCKED.getValue(),
+                KeyEventFlag.KEEP_TOUCH_MODE.getValue());
+    }
+
+    private static void assertParameters(Map<String, Object> params, AndroidKey key, Integer metastate, Integer flags) {
+        assertEquals(key.getCode(), params.get("keycode"));
+        assertEquals(metastate, params.get("metastate"));
+        assertEquals(flags, params.get("flags"));
+    }
+}