Add protection field to branch model.

src/main/java/com/spotify/github/v3/repos/Branch.java

@@ -52,5 +52,6 @@ public interface Branch {
   /** Branch protection API URL */
   @JsonDeserialize(using = BranchProtectionUrlDeserializer.class)
   Optional<URI> protectionUrl();
-}
 
+  Optional<Protection> protection();
+}

src/main/java/com/spotify/github/v3/repos/Protection.java

@@ -0,0 +1,39 @@
+/*-
+ * -\-\-
+ * github-api
+ * --
+ * Copyright (C) 2016 - 2020 Spotify AB
+ * --
+ * 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 com.spotify.github.v3.repos;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.spotify.github.GithubStyle;
+import org.immutables.value.Value;
+
+/** Branch resource */
+@Value.Immutable
+@GithubStyle
+@JsonSerialize(as = ImmutableProtection.class)
+@JsonDeserialize(as = ImmutableProtection.class)
+public interface Protection {
+  boolean enabled();
+
+  @JsonProperty("required_status_checks")
+  RequiredStatusChecks requiredStatusChecks();
+}

src/main/java/com/spotify/github/v3/repos/RequiredStatusChecks.java

@@ -0,0 +1,45 @@
+/*-
+ * -\-\-
+ * github-api
+ * --
+ * Copyright (C) 2016 - 2020 Spotify AB
+ * --
+ * 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 com.spotify.github.v3.repos;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.spotify.github.GithubStyle;
+import java.util.Collections;
+import java.util.List;
+import org.immutables.value.Value;
+import org.immutables.value.Value.Default;
+
+/** Branch resource */
+@Value.Immutable
+@GithubStyle
+@JsonSerialize(as = ImmutableRequiredStatusChecks.class)
+@JsonDeserialize(as = ImmutableRequiredStatusChecks.class)
+public interface RequiredStatusChecks {
+  @JsonProperty("enforcement_level")
+  String enforcementLevel();
+
+  @Default
+  default List<String> contexts() {
+    return Collections.emptyList();
+  }
+}

src/test/java/com/spotify/github/v3/clients/RepositoryClientTest.java

@@ -39,6 +39,7 @@
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.contains;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -303,6 +304,11 @@ public void getBranch() throws Exception {
     assertThat(
         branch.commit().url().toString(),
         is("https://api.github.com/repos/octocat/Hello-World/commits/c5b97d5ae6c19d5c5df71a34c7fbeeda2479ccbc"));
+    assertTrue(branch.protection().isPresent());
+    assertTrue(branch.protection().get().enabled());
+    assertThat(branch.protection().get().requiredStatusChecks().enforcementLevel(), is("non_admins"));
+    assertTrue(branch.protection().get().requiredStatusChecks().contexts().contains("Context 1"));
+    assertTrue(branch.protection().get().requiredStatusChecks().contexts().contains("Context 2"));
   }
 
   @Test

src/test/resources/com/spotify/github/v3/repos/branch.json

@@ -5,5 +5,15 @@
     "url": "https://api.github.com/repos/octocat/Hello-World/commits/c5b97d5ae6c19d5c5df71a34c7fbeeda2479ccbc"
   },
   "protected": true,
+  "protection": {
+    "enabled": true,
+    "required_status_checks": {
+      "enforcement_level": "non_admins",
+      "contexts": [
+        "Context 1",
+        "Context 2"
+      ]
+    }
+  },
   "protection_url": "https://api.github.com/repos/octocat/Hello-World/branches/master/protection"
 }