Make asserts meaningful (#232)

Author: elharo

maven-scm-plugin/src/test/java/org/apache/maven/scm/plugin/ChangeLogMojoTest.java

@@ -103,7 +103,7 @@ public void testChangeLogWithBadUserDateFormat() throws Exception {
 
             fail("mojo execution must fail.");
         } catch (MojoExecutionException e) {
-            assertTrue(true);
+            assertNotNull(e.getMessage());
         }
     }
 
@@ -126,7 +126,7 @@ public void testChangeLogWithBadConnectionUrl() throws Exception {
 
             fail("mojo execution must fail.");
         } catch (MojoExecutionException e) {
-            assertTrue(true);
+            assertNotNull(e.getMessage());
         }
     }
 }

maven-scm-plugin/src/test/java/org/apache/maven/scm/plugin/CheckoutMojoTest.java

@@ -107,7 +107,7 @@ public void testSkipCheckoutWithoutConnectionUrl() throws Exception {
 
             fail("mojo execution must fail.");
         } catch (MojoExecutionException e) {
-            assertTrue(true);
+            assertNotNull(e.getMessage());
         }
     }
 

maven-scm-plugin/src/test/java/org/apache/maven/scm/plugin/UntagMojoTest.java

@@ -102,7 +102,7 @@ public void testUntag() throws Exception {
 
             fail("mojo execution must fail.");
         } catch (MojoExecutionException e) {
-            assertTrue(true);
+            assertNotNull(e.getMessage());
         }
     }
 

maven-scm-plugin/src/test/java/org/apache/maven/scm/plugin/ValidateMojoTest.java

@@ -52,7 +52,7 @@ public void testValidateWithInvalidScmUrls() throws Exception {
 
             fail("mojo execution must fail.");
         } catch (MojoExecutionException e) {
-            assertTrue(true);
+            assertNotNull(e.getMessage());
         }
     }
 }