GitHub #319: Improved error message for incompatible exec data files.

In case of incompatible execution data formats read from another JaCoCo
version ExecutionDataReader.read() now throws a
IncompatibleExecDataVersionException with a better error message.

2 files changed, 51 insertions, 2 deletions

diff --git a/org.jacoco.core.test/src/org/jacoco/core/data/ExecutionDataReaderWriterTest.java b/org.jacoco.core.test/src/org/jacoco/core/data/ExecutionDataReaderWriterTest.java
index 0efcf7a3..2b6dcbc3 100644
--- a/org.jacoco.core.test/src/org/jacoco/core/data/ExecutionDataReaderWriterTest.java
+++ b/org.jacoco.core.test/src/org/jacoco/core/data/ExecutionDataReaderWriterTest.java
@@ -135,8 +135,8 @@ public class ExecutionDataReaderWriterTest {
 		createReader().read();
 	}
 
-	@Test(expected = IOException.class)
-	public void testInvalidHeaderVersion() throws IOException {
+	@Test(expected = IncompatibleExecDataVersionException.class)
+	public void testInvalidVersion() throws IOException {
 		buffer = new ByteArrayOutputStream();
 		buffer.write(ExecutionDataWriter.BLOCK_HEADER);
 		buffer.write(0xC0);
diff --git a/org.jacoco.core.test/src/org/jacoco/core/data/IncompatibleExecDataVersionExceptionTest.java b/org.jacoco.core.test/src/org/jacoco/core/data/IncompatibleExecDataVersionExceptionTest.java
new file mode 100644
index 00000000..e1735fc1
--- /dev/null
+++ b/org.jacoco.core.test/src/org/jacoco/core/data/IncompatibleExecDataVersionExceptionTest.java
@@ -0,0 +1,49 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2015 Mountainminds GmbH & Co. KG and Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Marc R. Hoffmann - initial API and implementation
+ *    
+ *******************************************************************************/
+package org.jacoco.core.data;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link IncompatibleExecDataVersionExceptionTest}.
+ */
+public class IncompatibleExecDataVersionExceptionTest {
+
+	private IncompatibleExecDataVersionException exception;
+
+	@Before
+	public void setup() {
+		exception = new IncompatibleExecDataVersionException(0x1234);
+	}
+
+	@Test
+	public void testGetMessage() {
+		String expected = "Cannot read execution data version 0x1234. "
+				+ "This version of JaCoCo uses execution data version 0x"
+				+ Integer.toHexString(ExecutionDataWriter.FORMAT_VERSION) + ".";
+		assertEquals(expected, exception.getMessage());
+	}
+
+	@Test
+	public void testGetActualVersion() {
+		assertEquals(0x1234, exception.getActualVersion());
+	}
+
+	@Test
+	public void testGetExpectedVersion() {
+		assertEquals(ExecutionDataWriter.FORMAT_VERSION,
+				exception.getExpectedVersion());
+	}
+}