UnifiedDiffParserException: expected file start line not found

[tomasbjerre]

Describe the bug

I try to parse a patch-file, generated from git git format-patch -1 <commit>, with content:

From fd940c6f66126734e82c00889e7c987e11deea91 Mon Sep 17 00:00:00 2001
From: Tomas Bjerre <[email protected]>
Date: Sun, 6 Sep 2020 11:20:34 +0200
Subject: [PATCH] removing file

---
 .../violations/lib/model/ViolationTest.java   | 37 -------------------
 1 file changed, 37 deletions(-)
 delete mode 100644 src/test/java/se/bjurr/violations/lib/model/ViolationTest.java

diff --git a/src/test/java/se/bjurr/violations/lib/model/ViolationTest.java b/src/test/java/se/bjurr/violations/lib/model/ViolationTest.java
deleted file mode 100644
index 3e40b52..0000000
--- a/src/test/java/se/bjurr/violations/lib/model/ViolationTest.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package se.bjurr.violations.lib.model;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static se.bjurr.violations.lib.model.SEVERITY.ERROR;
-import static se.bjurr.violations.lib.model.Violation.violationBuilder;
-import static se.bjurr.violations.lib.reports.Parser.CHECKSTYLE;
-
-import org.junit.Test;
-import se.bjurr.violations.lib.model.Violation.ViolationBuilder;
-import uk.co.jemos.podam.api.PodamFactoryImpl;
-
-public class ViolationTest {
-
-  @Test
-  public void testThatFilePathsAreAlwaysFronSlashes() {
-    final Violation violation =
-        violationBuilder() //
-            .setParser(CHECKSTYLE) //
-            .setFile("c:\\path\\to\\file.xml") //
-            .setMessage("message") //
-            .setSeverity(ERROR) //
-            .setStartLine(1) //
-            .build();
-    assertThat(violation.getFile()) //
-        .isEqualTo("c:/path/to/file.xml");
-  }
-
-  @Test
-  public void testThatCopyConstructorWorks() {
-    final ViolationBuilder originalBuilder =
-        new PodamFactoryImpl().manufacturePojo(ViolationBuilder.class);
-    final Violation original = originalBuilder.build();
-    final Violation copied = new Violation(original);
-    assertThat(copied) //
-        .isEqualTo(original);
-  }
-}
-- 
2.25.1

I get error like:

com.github.difflib.unifieddiff.UnifiedDiffParserException: expected file start line not found
	at com.github.difflib.unifieddiff.UnifiedDiffReader.parse(UnifiedDiffReader.java:93)
	at com.github.difflib.unifieddiff.UnifiedDiffReader.parseUnifiedDiff(UnifiedDiffReader.java:144)

To Reproduce

Parse above data with:

    InputStream reportContentStream = new ByteArrayInputStream(reportContent.getBytes(UTF_8));
    UnifiedDiff parsedDiff = UnifiedDiffReader.parseUnifiedDiff(reportContentStream);

Expected behavior
Not to crash

System

• Java version 1.8.0_171
• Version 4.8-SNAPSHOT de04bd6

Relates to tomasbjerre/violations-lib#95

[wumpz]

The problem was the deleted file mode.