This file is indexed.

/usr/share/X11/xkb/compat/xtest is in xkb-data 2.5-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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default xkb_compatibility "xtest"  {

    // Minimal set of symbol interpretations to provide
    // reasonable behavior for testing.   The X Test 
    // Suite assumes that it can set any modifier by 
    // simulating a KeyPress and clear it by simulating 
    // a KeyRelease.  Because of the way that XKB 
    // implements locking/latching modifiers, this 
    // approach fails in some cases (typically the 
    // lock or num lock modifiers).  These symbol
    // interpretations make all modifier keys just
    // set the corresponding modifier so that xtest
    // will see the behavior it expects.

    virtual_modifiers NumLock,AltGr;

    interpret.repeat= False;
    setMods.clearLocks= True;
    latchMods.clearLocks= True;
    latchMods.latchToLock= False;

    interpret Shift_Lock+AnyOf(Shift+Lock) {
	action= SetMods(modifiers=Shift);
    };

    interpret Num_Lock+Any {
	virtualModifier= NumLock;
	action= SetMods(modifiers=NumLock);
    };

    interpret Mode_switch {
	useModMapMods= level1;
	virtualModifier= AltGr;
	action= SetGroup(group=2);
    };

    interpret Any + Any {
	action= SetMods(modifiers=modMapMods);
    };

    group 2 = AltGr;
    group 3 = AltGr;
    group 4 = AltGr;

    indicator.allowExplicit= False;
    indicator "Caps Lock" { 
	modifiers= Lock;
    };
    indicator "Num Lock" {
	modifiers= NumLock;
    };
    indicator "Shift Lock" {
	whichModState= Locked;
	modifiers= Shift;
    };
    indicator.allowExplicit= True;
};