Fix diff parsing and run unit tests (#1190)

Closes https://codeberg.org/gitnex/GitNex/issues/1167

The regex didn't match if the raw string starts with a `+` or `-`.

Co-authored-by: qwerty287 <ndev@web.de>
Reviewed-on: https://codeberg.org/gitnex/GitNex/pulls/1190
Reviewed-by: M M Arif <mmarif@noreply.codeberg.org>
Co-authored-by: qwerty287 <qwerty287@noreply.codeberg.org>
Co-committed-by: qwerty287 <qwerty287@noreply.codeberg.org>

.woodpecker/check.yml

@@ -13,3 +13,8 @@ pipeline:
     settings:
       file_pattern: "*.java"
       path: "app/"
+
+  test:
+    image: alvrme/alpine-android:android-31-jdk11
+    commands:
+      - ./gradlew test

app/src/main/java/org/mian/gitnex/helpers/ParseDiff.java

@@ -43,6 +43,12 @@ public class ParseDiff {
 		Matcher rmMatcher = rmPattern.matcher(raw);
 		Matcher addMatcher = addPattern.matcher(raw);
 
+		if(raw.startsWith("+")) {
+			add++;
+		}
+		else if(raw.startsWith("-")) {
+			rm++;
+		}
 		while(rmMatcher.find())
 			rm++;
 		while(addMatcher.find())