Machine Installation id based Oauth 2

cygnus-cloud-client/src/test/java/com/cygnus/client/CloudClientPropertiesTest.java

@@ -0,0 +1,42 @@
+package com.cygnus.client;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.net.URI;
+import java.time.Duration;
+import org.junit.jupiter.api.Test;
+
+class CloudClientPropertiesTest {
+
+    @Test
+    void configurationRequiresMachineCredentials() {
+        CloudClientProperties properties = properties("", "", "");
+
+        assertThrows(IllegalStateException.class, properties::validate);
+    }
+
+    @Test
+    void configurationAcceptsCompleteMachineIdentity() {
+        CloudClientProperties properties =
+                properties("customer-a", "site-01", "signed-assertion");
+
+        assertDoesNotThrow(properties::validate);
+    }
+
+    private CloudClientProperties properties(
+            String clientId,
+            String installationId,
+            String assertion) {
+        return new CloudClientProperties(
+                URI.create("https://cloud.example.test"),
+                URI.create("https://identity.example.test/oauth2/token"),
+                clientId,
+                installationId,
+                assertion,
+                "login-key-01",
+                "file:./login-public.pem",
+                Duration.ofSeconds(10),
+                Duration.ofSeconds(30));
+    }
+}