@Test
	public void testIsExtension_Folder() throws Exception {
		File extDir = createTempDirectory("TestExtFolder");
		new File(extDir, "extension.properties").createNewFile();
		assertTrue(ExtensionUtils.isExtension(extDir));

		errorsExpected(() -> {
			File nonExtDir = createTempDirectory("TestNonExtFolder");
			assertFalse(ExtensionUtils.isExtension(nonExtDir));
		});
	}
Tests for the {@link ExtensionInstaller} class.
Ghidra/Framework/Project/src/test/java/ghidra/framework/project/extensions/ExtensionInstallerTest.java