Added failing test

(a bit dirty using a spy for the actual "system under test" but it is the quickest way to test added functionality and mocking out complexity around coroutines and httpclient)

app/src/test/java/com/vitorpamplona/amethyst/service/Nip05VerifierTest.kt

@@ -0,0 +1,93 @@
+package com.vitorpamplona.amethyst.service
+
+import io.mockk.MockKAnnotations
+import io.mockk.every
+import io.mockk.impl.annotations.SpyK
+import io.mockk.unmockkAll
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.fail
+import org.junit.Before
+import org.junit.Test
+
+class Nip05VerifierTest {
+    private val ALL_UPPER_CASE_USER_NAME = "ONETWO"
+    private val ALL_LOWER_CASE_USER_NAME = "onetwo"
+
+    @SpyK
+    var nip05Verifier = Nip05Verifier()
+
+    @Before
+    fun setUp() = MockKAnnotations.init(this)
+
+    @Test
+    fun `test with matching case on user name`() {
+        // Set-up
+        val userNameToTest = ALL_UPPER_CASE_USER_NAME
+        val expectedPubKey = "ca29c211f1c72d5b6622268ff43d2288ea2b2cb5b9aa196ff9f1704fc914b71b"
+
+        val nostrJson = "{\n" +
+            "  \"names\": {\n" +
+            "    \"$userNameToTest\": \"$expectedPubKey\" \n" +
+            "  }\n" +
+            "}"
+
+        every { nip05Verifier.fetchNip05Json(any(), any(), any()) } answers {
+            secondArg<(String) -> Unit>().invoke(nostrJson)
+        }
+
+        val nip05 = "$userNameToTest@domain.com"
+        var actualPubkeyHex = ""
+
+        // Execution
+        nip05Verifier.verifyNip05(
+            nip05,
+            onSuccess = {
+                actualPubkeyHex = it
+            },
+            onError = {
+                fail("Test failure")
+            }
+        )
+
+        // Verification
+        assertEquals(expectedPubKey, actualPubkeyHex)
+    }
+
+    @Test
+    fun `test with NOT matching case on user name`() {
+        // Set-up
+        val expectedPubKey = "ca29c211f1c72d5b6622268ff43d2288ea2b2cb5b9aa196ff9f1704fc914b71b"
+
+        val nostrJson = "{\n" +
+            "  \"names\": {\n" +
+            "    \"$ALL_UPPER_CASE_USER_NAME\": \"$expectedPubKey\" \n" +
+            "  }\n" +
+            "}"
+        every { nip05Verifier.fetchNip05Json(any(), any(), any()) } answers {
+            secondArg<(String) -> Unit>().invoke(nostrJson)
+        }
+
+        val nip05 = "$ALL_LOWER_CASE_USER_NAME@domain.com"
+        var actualPubkeyHex = ""
+
+        // Execution
+        nip05Verifier.verifyNip05(
+            nip05,
+            onSuccess = {
+                actualPubkeyHex = it
+            },
+            onError = {
+                fail("Test failure")
+            }
+        )
+
+        // Verification
+        assertEquals(expectedPubKey, actualPubkeyHex)
+    }
+
+    @After
+    fun tearDown() {
+        unmockkAll()
+    }
+}