private ListingActionContext getCurrentContext() {
		CodeBrowserPlugin cbp = env.getPlugin(CodeBrowserPlugin.class);
		return (ListingActionContext) cbp.getProvider().getActionContext(null);
	}
Moves the program location to the given address and returns the 
instruction at that location.

@param addressString The address location to move to.
@return The instruction at the new location or null if there is no
        instruction.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/processors/ShowInstructionInfoPluginTest.java