add unit test to verify isInitialized() behavior

lib/src/test/java/dev/marcelpinto/permissionktx/PermissionProviderTest.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Marcel Pinto Biescas
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *          http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dev.marcelpinto.permissionktx
+
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.flow.emptyFlow
+import org.junit.Test
+
+class PermissionProviderTest {
+
+
+    private val fakeChecker = object : PermissionChecker {
+        override fun getStatus(type: Permission) = PermissionStatus.Granted(Permission("any"))
+    }
+
+    private val dummyObserver = object : PermissionObserver {
+        override fun getStatusFlow(type: Permission) = emptyFlow<PermissionStatus>()
+        override fun refreshStatus() {}
+    }
+
+    @Test
+    fun `test isInitialized when PermissionProvider is initialized`() {
+        assertThat(PermissionProvider.isInitialized()).isFalse()
+        PermissionProvider.init(fakeChecker, dummyObserver)
+        assertThat(PermissionProvider.isInitialized()).isTrue()
+    }
+}