[opentelemetry][IJPL-163526] common telemetry context propagation covered with a test

GitOrigin-RevId: d8b43f2d834da5d8277964db6cdf206afc5dabc5

platform/diagnostic/telemetry/rt/testSrc/com/intellij/platform/diagnostic/telemetry/rt/context/TelemetryContextPropagationTest.kt

@@ -0,0 +1,59 @@
+// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
+package com.intellij.platform.diagnostic.telemetry.rt.context
+
+import io.opentelemetry.api.trace.Span
+import io.opentelemetry.api.trace.SpanContext
+import io.opentelemetry.api.trace.TraceFlags
+import io.opentelemetry.api.trace.TraceState
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Test
+
+class TelemetryContextPropagationTest : TelemetryContextConfiguringTestCase() {
+
+  @Test
+  fun `test context propagation from IDEA side`() {
+    val traceId = "79a7da3d96c8ff6350d304ca56f56711"
+    val spanId = "b8da87d1d227aedc"
+    withTestContext(traceId, spanId) {
+      val currentContext = TelemetryContext.current()
+      val capturedContext = currentContext.asString()
+      assertEquals("traceparent=00-$traceId-$spanId-00", capturedContext)
+      val recreatedContext = TelemetryContext.fromString(capturedContext)
+      assertEquals(currentContext, recreatedContext)
+    }
+  }
+
+  @Test
+  fun `test context propagation onto IDEA side`() {
+    val traceId = "42a7da3d96c8ff6350d304ca56f56711"
+    val spanId = "b8da87d1d242aedc"
+    val context = TelemetryContext.fromString("traceparent=00-$traceId-$spanId-00")
+    context.extract()
+      .makeCurrent()
+      .use { _ ->
+        val currentContext = Span.current().spanContext
+        assertEquals(traceId, currentContext.traceId)
+        assertEquals(spanId, currentContext.spanId)
+      }
+  }
+
+  @Test
+  fun `context deserialization should be fail-safe`() {
+    assertNotNull(TelemetryContext.fromString("abc"))
+    assertNotNull(TelemetryContext.fromString("abc,"))
+    assertNotNull(TelemetryContext.fromString("abc,            , , , ,  "))
+  }
+
+  private fun withTestContext(traceId: String, spanId: String, fn: () -> Unit) {
+    val ctx = SpanContext.createFromRemoteParent(
+      traceId,
+      spanId,
+      TraceFlags.getDefault(),
+      TraceState.getDefault()
+    )
+    Span.wrap(ctx)
+      .makeCurrent()
+      .use { _ -> fn() }
+  }
+}