1 files changed, 235 insertions, 0 deletions
diff --git a/api/src/test/java/io/opencensus/trace/TracestateTest.java b/api/src/test/java/io/opencensus/trace/TracestateTest.java
new file mode 100644
index 00000000..b347d8ad
--- /dev/null
+++ b/api/src/test/java/io/opencensus/trace/TracestateTest.java
@@ -0,0 +1,235 @@
+/*
+ * Copyright 2018, OpenCensus Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.opencensus.trace;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.testing.EqualsTester;
+import io.opencensus.trace.Tracestate.Entry;
+import java.util.Arrays;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for {@link Tracestate}. */
+@RunWith(JUnit4.class)
+public class TracestateTest {
+  private static final String FIRST_KEY = "key_1";
+  private static final String SECOND_KEY = "key_2";
+  private static final String FIRST_VALUE = "value.1";
+  private static final String SECOND_VALUE = "value.2";
+
+  @Rule public final ExpectedException thrown = ExpectedException.none();
+
+  private static final Tracestate EMPTY = new Tracestate.Builder().build();
+  private final Tracestate firstTracestate = EMPTY.toBuilder().set(FIRST_KEY, FIRST_VALUE).build();
+  private final Tracestate secondTracestate =
+      EMPTY.toBuilder().set(SECOND_KEY, SECOND_VALUE).build();
+  private final Tracestate multiValueTracestate =
+      EMPTY.toBuilder().set(FIRST_KEY, FIRST_VALUE).set(SECOND_KEY, SECOND_VALUE).build();
+
+  @Test
+  public void get() {
+    assertThat(firstTracestate.get(FIRST_KEY)).isEqualTo(FIRST_VALUE);
+    assertThat(secondTracestate.get(SECOND_KEY)).isEqualTo(SECOND_VALUE);
+    assertThat(multiValueTracestate.get(FIRST_KEY)).isEqualTo(FIRST_VALUE);
+    assertThat(multiValueTracestate.get(SECOND_KEY)).isEqualTo(SECOND_VALUE);
+  }
+
+  @Test
+  public void getEntries() {
+    assertThat(firstTracestate.getEntries()).containsExactly(Entry.create(FIRST_KEY, FIRST_VALUE));
+    assertThat(secondTracestate.getEntries())
+        .containsExactly(Entry.create(SECOND_KEY, SECOND_VALUE));
+    assertThat(multiValueTracestate.getEntries())
+        .containsExactly(
+            Entry.create(FIRST_KEY, FIRST_VALUE), Entry.create(SECOND_KEY, SECOND_VALUE));
+  }
+
+  @Test
+  public void disallowsNullKey() {
+    thrown.expect(NullPointerException.class);
+    EMPTY.toBuilder().set(null, FIRST_VALUE).build();
+  }
+
+  @Test
+  public void invalidFirstKeyCharacter() {
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set("1_key", FIRST_VALUE).build();
+  }
+
+  @Test
+  public void invalidKeyCharacters() {
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set("kEy_1", FIRST_VALUE).build();
+  }
+
+  @Test
+  public void invalidKeySize() {
+    char[] chars = new char[257];
+    Arrays.fill(chars, 'a');
+    String longKey = new String(chars);
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set(longKey, FIRST_VALUE).build();
+  }
+
+  @Test
+  public void allAllowedKeyCharacters() {
+    StringBuilder stringBuilder = new StringBuilder();
+    for (char c = 'a'; c <= 'z'; c++) {
+      stringBuilder.append(c);
+    }
+    for (char c = '0'; c <= '9'; c++) {
+      stringBuilder.append(c);
+    }
+    stringBuilder.append('_');
+    stringBuilder.append('-');
+    stringBuilder.append('*');
+    stringBuilder.append('/');
+    String allowedKey = stringBuilder.toString();
+    assertThat(EMPTY.toBuilder().set(allowedKey, FIRST_VALUE).build().get(allowedKey))
+        .isEqualTo(FIRST_VALUE);
+  }
+
+  @Test
+  public void disallowsNullValue() {
+    thrown.expect(NullPointerException.class);
+    EMPTY.toBuilder().set(FIRST_KEY, null).build();
+  }
+
+  @Test
+  public void valueCannotContainEqual() {
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set(FIRST_KEY, "my_vakue=5").build();
+  }
+
+  @Test
+  public void valueCannotContainComma() {
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set(FIRST_KEY, "first,second").build();
+  }
+
+  @Test
+  public void valueCannotContainTrailingSpaces() {
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set(FIRST_KEY, "first ").build();
+  }
+
+  @Test
+  public void invalidValueSize() {
+    char[] chars = new char[257];
+    Arrays.fill(chars, 'a');
+    String longValue = new String(chars);
+    thrown.expect(IllegalArgumentException.class);
+    EMPTY.toBuilder().set(FIRST_KEY, longValue).build();
+  }
+
+  @Test
+  public void allAllowedValueCharacters() {
+    StringBuilder stringBuilder = new StringBuilder();
+    for (char c = ' ' /* '\u0020' */; c <= '~' /* '\u007E' */; c++) {
+      if (c == ',' || c == '=') {
+        continue;
+      }
+      stringBuilder.append(c);
+    }
+    String allowedValue = stringBuilder.toString();
+    assertThat(EMPTY.toBuilder().set(FIRST_KEY, allowedValue).build().get(FIRST_KEY))
+        .isEqualTo(allowedValue);
+  }
+
+  @Test
+  public void addEntry() {
+    assertThat(firstTracestate.toBuilder().set(SECOND_KEY, SECOND_VALUE).build())
+        .isEqualTo(multiValueTracestate);
+  }
+
+  @Test
+  public void updateEntry() {
+    assertThat(firstTracestate.toBuilder().set(FIRST_KEY, SECOND_VALUE).build().get(FIRST_KEY))
+        .isEqualTo(SECOND_VALUE);
+    Tracestate updatedMultiValueTracestate =
+        multiValueTracestate.toBuilder().set(FIRST_KEY, SECOND_VALUE).build();
+    assertThat(updatedMultiValueTracestate.get(FIRST_KEY)).isEqualTo(SECOND_VALUE);
+    assertThat(updatedMultiValueTracestate.get(SECOND_KEY)).isEqualTo(SECOND_VALUE);
+  }
+
+  @Test
+  public void addAndUpdateEntry() {
+    assertThat(
+            firstTracestate
+                .toBuilder()
+                .set(FIRST_KEY, SECOND_VALUE) // update the existing entry
+                .set(SECOND_KEY, FIRST_VALUE) // add a new entry
+                .build()
+                .getEntries())
+        .containsExactly(
+            Entry.create(FIRST_KEY, SECOND_VALUE), Entry.create(SECOND_KEY, FIRST_VALUE));
+  }
+
+  @Test
+  public void addSameKey() {
+    assertThat(
+            EMPTY
+                .toBuilder()
+                .set(FIRST_KEY, SECOND_VALUE) // update the existing entry
+                .set(FIRST_KEY, FIRST_VALUE) // add a new entry
+                .build()
+                .getEntries())
+        .containsExactly(Entry.create(FIRST_KEY, FIRST_VALUE));
+  }
+
+  @Test
+  public void remove() {
+    assertThat(multiValueTracestate.toBuilder().remove(SECOND_KEY).build())
+        .isEqualTo(firstTracestate);
+  }
+
+  @Test
+  public void addAndRemoveEntry() {
+    assertThat(
+            EMPTY
+                .toBuilder()
+                .set(FIRST_KEY, SECOND_VALUE) // update the existing entry
+                .remove(FIRST_KEY) // add a new entry
+                .build())
+        .isEqualTo(EMPTY);
+  }
+
+  @Test
+  public void remove_NullNotAllowed() {
+    thrown.expect(NullPointerException.class);
+    multiValueTracestate.toBuilder().remove(null).build();
+  }
+
+  @Test
+  public void tracestate_EqualsAndHashCode() {
+    EqualsTester tester = new EqualsTester();
+    tester.addEqualityGroup(EMPTY, EMPTY);
+    tester.addEqualityGroup(firstTracestate, EMPTY.toBuilder().set(FIRST_KEY, FIRST_VALUE).build());
+    tester.addEqualityGroup(
+        secondTracestate, EMPTY.toBuilder().set(SECOND_KEY, SECOND_VALUE).build());
+    tester.testEquals();
+  }
+
+  @Test
+  public void tracestate_ToString() {
+    assertThat(EMPTY.toString()).isEqualTo("Tracestate{entries=[]}");
+  }
+}