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denoland-deno/tests/specs/cli/otel_basic/context.ts

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import { assertEquals } from "@std/assert";
const { ContextManager } = Deno.telemetry;
const cm = new ContextManager();
const a = cm.active();
const b = a.setValue("b", 1);
const c = b.setValue("c", 2);
const subB = c.deleteValue("b");
const subC = subB.deleteValue("c");
assertEquals(a.getValue("b"), undefined);
assertEquals(b.getValue("b"), 1);
assertEquals(c.getValue("b"), 1);
assertEquals(a.getValue("c"), undefined);
assertEquals(b.getValue("c"), undefined);
assertEquals(c.getValue("c"), 2);
assertEquals(subB.getValue("b"), undefined);
assertEquals(subB.getValue("c"), 2);
assertEquals(subC.getValue("b"), undefined);
assertEquals(subC.getValue("c"), undefined);