Add unit tests

Author: jack-berg

api/incubator/src/test/java/io/opentelemetry/api/incubator/common/ExtendedAttributeKeyTest.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.incubator.common;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.api.common.AttributeKey;
+import java.util.stream.Stream;
+import javax.annotation.Nullable;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class ExtendedAttributeKeyTest {
+
+  @ParameterizedTest
+  @MethodSource("attributeKeyArgs")
+  void test(
+      ExtendedAttributeKey<?> key,
+      String expectedKey,
+      ExtendedAttributeType expectedType,
+      @Nullable AttributeKey<?> expectedAttributeKey) {
+    assertThat(key.getKey()).isEqualTo(expectedKey);
+    assertThat(key.getType()).isEqualTo(expectedType);
+    assertThat(key.asAttributeKey()).isEqualTo(expectedAttributeKey);
+
+    if (expectedAttributeKey != null) {
+      ExtendedAttributeKey<?> extendedAttributeKey =
+          ExtendedAttributeKey.fromAttributeKey(expectedAttributeKey);
+      assertThat(extendedAttributeKey).isEqualTo(key);
+    }
+  }
+
+  private static Stream<Arguments> attributeKeyArgs() {
+    return Stream.of(
+        Arguments.of(
+            ExtendedAttributeKey.stringKey("key"),
+            "key",
+            ExtendedAttributeType.STRING,
+            AttributeKey.stringKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.booleanKey("key"),
+            "key",
+            ExtendedAttributeType.BOOLEAN,
+            AttributeKey.booleanKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.longKey("key"),
+            "key",
+            ExtendedAttributeType.LONG,
+            AttributeKey.longKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.doubleKey("key"),
+            "key",
+            ExtendedAttributeType.DOUBLE,
+            AttributeKey.doubleKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.stringArrayKey("key"),
+            "key",
+            ExtendedAttributeType.STRING_ARRAY,
+            AttributeKey.stringArrayKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.booleanArrayKey("key"),
+            "key",
+            ExtendedAttributeType.BOOLEAN_ARRAY,
+            AttributeKey.booleanArrayKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.longArrayKey("key"),
+            "key",
+            ExtendedAttributeType.LONG_ARRAY,
+            AttributeKey.longArrayKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.doubleArrayKey("key"),
+            "key",
+            ExtendedAttributeType.DOUBLE_ARRAY,
+            AttributeKey.doubleArrayKey("key")),
+        Arguments.of(
+            ExtendedAttributeKey.extendedAttributesKey("key"),
+            "key",
+            ExtendedAttributeType.EXTENDED_ATTRIBUTES,
+            null));
+  }
+}