doubt in this code

[J radolf]

suppose in my original code am reading a properties file

and now suppose in my testclass am doing

 
	public void testLoadProperties(){
		Properties valueProp = desProxy.loadProperties();
		assertNotNull(valueProp);
	}
   

i copied it from somewhere else. please can anyone explain what is happening in assertNotNull(valueProp) line?
can anyone explain the meaning?

[J radolf]

is it enough if we write so much how can we test it. when am trying to run the junit . it is giving me error like no junits found in eclipse.

[J radolf]

is it valid to write try catch block within a junit testmethod?

[Ernest Friedman-Hill]

1) assertNotNull() will record a test failure if the argument is null. So that test will succeed if loadProperties() returns non-null.

2) To help you with this problem, you'd need to be a little more precise about what error you're seeing. You need to have your test project include the org.junit plugin that comes with Eclipse on its build path, so perhaps that's the issue you're seeing.

3) Sure, why not? A test method can include any code you want. I often write tests like

try {
    doSomething();
    fail("Expected doSomething() to throw an exception");
} catch (FooException ex) {
    assertEquals("Whatever", ex.getMessage());
} catch (Throwable t) {
    fail("doSomething() threw the wrong exception");
}