Bug 65399 changing a "Run a Single Test" configuration into "Run All Tests in..." does not run all tests [JUnit]
First I ran a single test (by selecting the test method and then choosing Run/JUnit Test from its context menu actions). Then I decided to run all tests in the package instead. So inside the Launching Configurations dialog I chose the option Run All Tests in selected project, package or folder and selected the package which contained the test class I had previously selected. Surprisingly it did not run all tests in the package I chose in the previous dialog, rather it ran only the same test from which I created that initial launching configuration. This is a bug which users are very likely to encounter: initially they will want to run a single test and then change their mind and try to run all tests within the corresponding package. 3.0 RC1 Build id: 200405290105
org.eclipse.jdt.junit/src/org/eclipse/jdt/internal/junit/launcher/JUnitMainTab.java
setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.projectnotexists")); 
			return;
		}
		
		try {
			if (!project.hasNature(JavaCore.NATURE_ID)) {
				setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.notJavaProject")); 
				return;
			}
			IJavaProject jProject = getJavaProject();
			String className = fTestText.getText().trim();
			if (className.length() == 0) {
				setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.testnotdefined")); 
				return;
			}
			IType type = jProject.findType(className);
			if (type == null)
				setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.testnotexists")); 
			else if (!TestSearchEngine.isTestOrTestSuite(type))
				setErrorMessage(JUnitMessages.getString("JUnitMainTab.error.invalidTest")); 
		} catch (Exception e) {
		}
	}
	private void setEnableContainerTestGroup(boolean enabled) {
		fContainerSearchButton.setEnabled(enabled);
		fContainerText.setEnabled(enabled);
	}
	private void setEnableSingleTestGroup(boolean enabled) {
		fProjLabel.setEnabled(enabled);
		fProjText.setEnabled(enabled);