Add isConfigured

purchases/src/main/kotlin/com/revenuecat/purchases/Purchases.kt

@@ -1798,6 +1798,13 @@ class Purchases @VisibleForTesting(otherwise = VisibleForTesting.PRIVATE) intern
         @JvmStatic
         var proxyURL: URL? = null
 
+        /**
+         * True if [configure] has been called and [Purchases.sharedInstance] is set
+         */
+        @JvmStatic
+        val isConfigured: Boolean
+            get() = this.backingFieldSharedInstance != null
+
         /**
          * Configures an instance of the Purchases SDK with a specified API key. The instance will
          * be set as a singleton. You should access the singleton instance using [Purchases.sharedInstance]

purchases/src/test/java/com/revenuecat/purchases/PurchasesTest.kt

@@ -4090,6 +4090,17 @@ class PurchasesTest {
         assertThat(receivedUserCancelled).isFalse()
     }
 
+    @Test
+    fun `isConfigured is true if there's an instance set`() {
+        assertThat(Purchases.isConfigured).isTrue()
+    }
+
+    @Test
+    fun `isConfigured is false if there's no instance set`() {
+        Purchases.backingFieldSharedInstance = null
+        assertThat(Purchases.isConfigured).isFalse()
+    }
+
     private fun mockBackend(errorGettingPurchaserInfo: PurchasesError? = null) {
         with(mockBackend) {
             if (errorGettingPurchaserInfo != null) {