Reason for failed assert that the log file doesn't contain message

Provide details on what lines are missing from what log file.

Change-Id: I15f0a0ee37feef6470ffbea631e27ee987a9c0e3
Signed-off-by: Mykola Nikishov <mn@mn.com.ua>
diff --git a/bundles/org.eclipse.equinox.p2.tests/src/org/eclipse/equinox/p2/tests/AbstractProvisioningTest.java b/bundles/org.eclipse.equinox.p2.tests/src/org/eclipse/equinox/p2/tests/AbstractProvisioningTest.java
index a268a86..7e051f8 100644
--- a/bundles/org.eclipse.equinox.p2.tests/src/org/eclipse/equinox/p2/tests/AbstractProvisioningTest.java
+++ b/bundles/org.eclipse.equinox.p2.tests/src/org/eclipse/equinox/p2/tests/AbstractProvisioningTest.java
@@ -1497,7 +1497,7 @@
 		} finally {
 			reader.close();
 		}
-		assertTrue(false);
+		fail(String.format("Log file %s doesn't contain lines %s", log.getCanonicalPath(), Arrays.toString(lines)));
 	}
 
 	/**
@@ -1524,7 +1524,7 @@
 				String line = reader.readLine();
 				if (line.indexOf(lines[idx]) >= 0) {
 					if (++idx >= lines.length) {
-						assertTrue(false);
+						fail(String.format("Log file %s contains lines %s", log.getCanonicalPath(), Arrays.toString(lines)));
 					}
 				}
 			}