(refactor) Replace complex parsing logic from GHEvent.type to GHEvent with static mapping

[https://github.com/hub4j/github-api/issues/1099]

src/test/java/org/kohsuke/github/GHEventTest.java

@@ -0,0 +1,34 @@
+package org.kohsuke.github;
+
+import org.junit.Test;
+import org.kohsuke.github.GHEvent.GitHubEventType;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class GHEventTest {
+
+    /**
+     * Function from GHEventInfo to transform string event to GHEvent which has been replaced by static mapping due to
+     * complex parsing logic below
+     */
+    private static GHEvent oldTransformationFunction(String t) {
+        if (t.endsWith("Event")) {
+            t = t.substring(0, t.length() - 5);
+        }
+        for (GHEvent e : GHEvent.values()) {
+            if (e.name().replace("_", "").equalsIgnoreCase(t)) {
+                return e;
+            }
+        }
+        return GHEvent.UNKNOWN;
+    }
+
+    @Test
+    public void regressionTest() {
+        for (GitHubEventType gitHubEventType : GitHubEventType.values()) {
+            assertThat(GitHubEventType.transformToGHEvent(gitHubEventType.name()),
+                    is(oldTransformationFunction(gitHubEventType.name())));
+        }
+    }
+}