test: add client breadcrumbs code cov

adds tests which cover client breadcrumb methods directly - other tests already verify the behaviour
of the breadcrumbs class itself.

sdk/src/androidTest/java/com/bugsnag/android/ClientTest.java

@@ -1,5 +1,6 @@
 package com.bugsnag.android;
 
+import static com.bugsnag.android.BugsnagTestUtils.generateClient;
 import static com.bugsnag.android.BugsnagTestUtils.getSharedPrefs;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -236,4 +237,28 @@ public void postSessionTrackingPayload(String urlString,
         assertEquals(customClient, client.sessionTracker.getApiClient());
     }
 
+    @Test
+    public void testMaxBreadcrumbs() {
+        Client client = generateClient();
+        assertEquals(0, client.breadcrumbs.store.size());
+
+        client.setMaxBreadcrumbs(1);
+
+        client.leaveBreadcrumb("test");
+        client.leaveBreadcrumb("another");
+        assertEquals(1, client.breadcrumbs.store.size());
+    }
+
+    @Test
+    public void testClearBreadcrumbs() {
+        Client client = generateClient();
+        assertEquals(0, client.breadcrumbs.store.size());
+
+        client.leaveBreadcrumb("test");
+        assertEquals(1, client.breadcrumbs.store.size());
+
+        client.clearBreadcrumbs();
+        assertEquals(0, client.breadcrumbs.store.size());
+    }
+
 }