Simplify and migrate resources content tests to JUnit 5 #903

[HeikoKlare]

Simplifies the tests in org.eclipse.core.tests.resources.content:

• Removes obsolete ContentTypeTest superclass for test classes, uses
  existing utility functionality instead
• Removes obsolete numbering of assertions
• Replaces try/catch/fail with assertThrows or making test framework
  handle the exception

Migrates the tests in org.eclipse.core.tests.resources.content to JUnit 5 by replacing according JUnit annotations and migrating assertions.

Contributes to #903

[eclipse-platform-bot]

This pull request changes some projects for the first time in this development cycle.
Therefore the following files need a version increment:

runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF

An additional commit containing all the necessary changes was pushed to the top of this PR's branch. To obtain these changes (for example if you want to push more changes) either fetch from your fork or apply the git patch.

Git patch

From 5cfcfc4895d0fc7c6a8fe77ecb36c33537594625 Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <[email protected]>
Date: Sun, 3 Nov 2024 11:13:29 +0000
Subject: [PATCH] Version bump(s) for 4.34 stream


diff --git a/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF b/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
index 88086087ff..d70afdf6ca 100644
--- a/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
+++ b/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: Eclipse Core Tests Harness
 Bundle-SymbolicName: org.eclipse.core.tests.harness;singleton:=true
-Bundle-Version: 3.17.0.qualifier
+Bundle-Version: 3.17.100.qualifier
 Bundle-Vendor: Eclipse.org
 Export-Package: org.eclipse.core.tests.harness;version="2.0",
  org.eclipse.core.tests.harness.session,
-- 
2.47.0

Further information are available in Common Build Issues - Missing version increments.

[github-actions]

Test Results

 1 755 files  ±0   1 755 suites  ±0   1h 35m 18s ⏱️ + 8m 26s
 4 170 tests +1   4 148 ✅ +1   22 💤 ±0  0 ❌ ±0 
13 107 runs  +3  12 943 ✅ +3  164 💤 ±0  0 ❌ ±0 

Results for commit 0511cbc. ± Comparison against base commit 4712d12.

This pull request removes 2 and adds 3 tests. Note that renamed tests count towards both.

AutomatedResourceTests AllContentTests IContentTypeManagerTest ‑ testContentDescription
AutomatedResourceTests AllContentTests SpecificContextTest ‑ testContentTypeLookup

AutomatedResourceTests AllContentTests IContentTypeManagerTest ‑ testContentDescription(boolean)[1] true
AutomatedResourceTests AllContentTests IContentTypeManagerTest ‑ testContentDescription(boolean)[2] false
AutomatedResourceTests AllContentTests SpecificContextTest ‑ testContentTypeLookup(TestInfo)

♻️ This comment has been updated with latest results.