public Set<Program> getOpenPrograms() {
		return Collections.unmodifiableSet(openTestPrograms);
	}
Open a read-only test program from the test data directory.
This program must be released prior to disposing this test environment.
NOTE: Some tests rely on this method returning null when file does
not yet exist within the resource area (e.g., test binaries for P-Code Tests)

@param progName name of program database within the test data directory.
@return program or null if program file not found
Ghidra/Features/Base/src/main/java/ghidra/test/TestProgramManager.java