add Song contains unit test

app/src/test/java/com/example/harmonyhub/components/SongCardTest.kt

@@ -0,0 +1,29 @@
+package com.example.harmonyhub.components
+
+import com.example.harmonyhub.ui.components.Song
+import com.example.harmonyhub.ui.components.contains
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class SongCardTest {
+    @Test
+    fun testContains() {
+        // Test the SongCard
+        var song = Song("1", "Conditionally", "Katy Perry", "imageResId", "url");
+        assertEquals(song.contains("Conditionally"), true);
+    }
+
+    @Test
+    fun testContainsArtist() {
+        // Test the SongCard
+        var song = Song("1", "Conditionally", "Katy Perry", "imageResId", "url");
+        assertEquals(song.contains("Kat"), true);
+    }
+
+    @Test()
+    fun testNoContains() {
+        // Test the SongCard
+        var song = Song("1", "Conditionally", "Katy Perry", "imageResId", "url");
+        assertEquals(song.contains("Taylor"), false);
+    }
+}