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EvolveRemoveAFieldTest.java
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EvolveRemoveAFieldTest.java
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package com.skraba.avro.enchiridion.core.evolution;
import static com.skraba.avro.enchiridion.core.evolution.BasicTest.BINARY_V1;
import static com.skraba.avro.enchiridion.core.evolution.BasicTest.SIMPLE_V1;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.is;
import com.skraba.avro.enchiridion.testkit.AvroVersion;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import org.apache.avro.Schema;
import org.apache.avro.SchemaBuilder;
import org.apache.avro.SchemaCompatibility;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
import org.junit.jupiter.api.Test;
/** Test reading data with a schema that has evolved by removing a field. */
public class EvolveRemoveAFieldTest {
/** The same as the original schema but with one less field. */
private static final Schema SIMPLE_V2 =
SchemaBuilder.record("com.skraba.avro.enchiridion.simple.SimpleRecord")
.fields()
.requiredString("name")
.endRecord();
@Test
public void testSchemaCompatibility() {
SchemaCompatibility.SchemaPairCompatibility compatibility =
SchemaCompatibility.checkReaderWriterCompatibility(SIMPLE_V2, SIMPLE_V1);
assertThat(compatibility.getType(), is(SchemaCompatibility.SchemaCompatibilityType.COMPATIBLE));
if (AvroVersion.avro_1_9.orAfter()) {
assertThat(
compatibility.getResult(),
is(SchemaCompatibility.SchemaCompatibilityResult.compatible()));
}
}
@Test
public void testRemoveAFieldFromARecord() {
// Check that schema resolution is OK by reading with the new schema.
GenericRecord recordV2;
try (ByteArrayInputStream bais = new ByteArrayInputStream(BINARY_V1)) {
Decoder decoder = DecoderFactory.get().binaryDecoder(bais, null);
GenericDatumReader<GenericRecord> r =
new GenericDatumReader<>(SIMPLE_V1, SIMPLE_V2, GenericData.get());
recordV2 = r.read(null, decoder);
} catch (IOException ioe) {
throw new RuntimeException((ioe));
}
// Ensure that the new field is read with the defaults.
assertThat(recordV2.getSchema(), is(SIMPLE_V2));
assertThat(recordV2.getSchema().getFields(), hasSize(1));
assertThat(recordV2.get("name").toString(), is("one"));
}
}