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import "env" for Environment
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Environment.set("WREN_TEST_VAR", "hello")
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System.print(Environment.get("WREN_TEST_VAR")) // expect: hello
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Environment.set("WREN_TEST_VAR", "world")
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System.print(Environment.get("WREN_TEST_VAR")) // expect: world
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Environment.delete("WREN_TEST_VAR")
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System.print(Environment.get("WREN_TEST_VAR") == null) // expect: true
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System.print(Environment.get("THIS_VAR_DOES_NOT_EXIST") == null) // expect: true
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var home = Environment.get("HOME")
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System.print(home != null) // expect: true
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var all = Environment.all
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System.print(all is Map) // expect: true
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System.print(all.count > 0) // expect: true
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