v8/test/mjsunit/compiler/globals.js

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// Test references and assignments to global variables.
var g = 0;

// Test compilation of a global variable store.
assertEquals(1, eval('g = 1'));
// Test that the store worked.
assertEquals(1, g);

// Test that patching the IC in the compiled code works.
assertEquals(1, eval('g = 1'));
assertEquals(1, g);
assertEquals(1, eval('g = 1'));
assertEquals(1, g);

// Test a second store.
assertEquals("2", eval('g = "2"'));
assertEquals("2", g);

// Test a load.
assertEquals("2", eval('g'));

// Test that patching the IC in the compiled code works.
assertEquals("2", eval('g'));
assertEquals("2", eval('g'));

// Test a second load.
g = 3;
assertEquals(3, eval('g'));