fix(notification): resume stored session before reply (#805)

app/src/test/java/com/m57/hermescontrol/data/session/ActiveSessionHolderTest.kt

@@ -0,0 +1,43 @@
+package com.m57.hermescontrol.data.session
+
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class ActiveSessionHolderTest {
+    @After
+    fun tearDown() {
+        ActiveSessionHolder.clear()
+    }
+
+    @Test
+    fun `runtime and stored ids resolve in both directions`() {
+        ActiveSessionHolder.set("runtime-session", "stored-session")
+
+        assertEquals("stored-session", ActiveSessionHolder.resolveStoredSessionId("runtime-session"))
+        assertEquals("runtime-session", ActiveSessionHolder.resolveRuntimeSessionId("stored-session"))
+    }
+
+    @Test
+    fun `session switch discards the previous mapping`() {
+        ActiveSessionHolder.set("runtime-previous", "stored-previous")
+        ActiveSessionHolder.clear()
+        ActiveSessionHolder.set("runtime-current", "stored-current")
+
+        assertEquals("runtime-previous", ActiveSessionHolder.resolveStoredSessionId("runtime-previous"))
+        assertNull(ActiveSessionHolder.resolveRuntimeSessionId("stored-previous"))
+    }
+
+    @Test
+    fun `mapping can be rebuilt after reconnect`() {
+        ActiveSessionHolder.set("runtime-before", "stored-session")
+        ActiveSessionHolder.clear()
+
+        assertNull(ActiveSessionHolder.activeSessionId.value)
+        assertNull(ActiveSessionHolder.resolveRuntimeSessionId("stored-session"))
+
+        ActiveSessionHolder.set("runtime-after", "stored-session")
+        assertEquals("runtime-after", ActiveSessionHolder.resolveRuntimeSessionId("stored-session"))
+    }
+}