Fixing #670: restoring allowSnapshots which was disabled in PR #665

src/it-repo/dummy-parent4-70.pom

@@ -0,0 +1,9 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>localhost</groupId>
+  <artifactId>dummy-parent4</artifactId>
+  <version>70</version>
+  <packaging>pom</packaging>
+</project>

src/it-repo/dummy-parent4-71-SNAPSHOT.pom

@@ -0,0 +1,9 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>localhost</groupId>
+  <artifactId>dummy-parent4</artifactId>
+  <version>71-SNAPSHOT</version>
+  <packaging>pom</packaging>
+</project>

src/it/it-update-parent-005-issue-670/invoker.properties

@@ -0,0 +1 @@
+invoker.goals = ${project.groupId}:${project.artifactId}:${project.version}:update-parent -DparentVersion=71-SNAPSHOT -DallowSnapshots

src/it/it-update-parent-005-issue-670/pom.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>localhost</groupId>
+        <artifactId>dummy-parent4</artifactId>
+        <version>70</version>
+    </parent>
+
+    <groupId>localhsot</groupId>
+    <artifactId>issue-670</artifactId>
+    <version>0.31-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+</project>

src/it/it-update-parent-005-issue-670/verify.groovy

@@ -0,0 +1,3 @@
+pom = new File( basedir, "pom.xml" ).text
+
+assert pom =~ /<version>71-SNAPSHOT<\/version>/

src/main/java/org/codehaus/mojo/versions/UpdateParentMojo.java

@@ -134,15 +134,13 @@ protected void update( ModifiedPomXMLEventReader pom )
         ArtifactVersion artifactVersion;
         try
         {
-            artifactVersion = findLatestVersion( artifact, versionRange, false, true,
-                    allowDowngrade );
+            artifactVersion = findLatestVersion( artifact, versionRange, null, false, allowDowngrade );
         }
         catch ( ArtifactMetadataRetrievalException e )
         {
             throw new MojoExecutionException( e.getMessage(), e );
         }
 
-
         if ( !shouldApplyUpdate( artifact, currentVersion, artifactVersion, forceUpdate ) )
         {
             return;

src/test/java/org/codehaus/mojo/versions/UpdateParentMojoTest.java

@@ -126,6 +126,11 @@ private static ArtifactMetadataSource mockArtifactMetaDataSource() throws Artifa
                                 new DefaultArtifactVersion( "1.0.0" ),
                                 new DefaultArtifactVersion( "0.9.0" ) );
                     }
+                    else if ( "issue-670-artifact".equals( artifact.getArtifactId() ) )
+                    {
+                        return Arrays.asList( new DefaultArtifactVersion( "0.0.1-1" ),
+                                new DefaultArtifactVersion( "0.0.1-1-impl-SNAPSHOT" ) );
+                    }
                     else if ( "unknown-artifact".equals( artifact.getArtifactId() ) )
                     {
                         return Collections.emptyList();
@@ -236,4 +241,51 @@ public void testParentDowngradeForbiddenWithRange()
         }
         assertThat( changeRecorder.getChanges(), is( empty() ) );
     }
+
+    @Test
+    public void testAllowSnapshots()
+            throws MojoExecutionException, XMLStreamException, MojoFailureException
+    {
+        mojo.allowSnapshots = true;
+        mojo.getProject().setParent( new MavenProject()
+        {{
+            setGroupId( "default-group" );
+            setArtifactId( "issue-670-artifact" );
+            setVersion( "0.0.1-1" );
+        }} );
+
+        try ( MockedStatic<PomHelper> pomHelper = mockStatic( PomHelper.class ) )
+        {
+            pomHelper.when( () -> PomHelper.setProjectParentVersion( any(), any() ) )
+                    .thenReturn( true );
+            mojo.update( null );
+        }
+        assertThat( changeRecorder.getChanges(), hasItem( new VersionChange( "default-group",
+                "issue-670-artifact", "0.0.1-1",
+                "0.0.1-1-impl-SNAPSHOT" ) ) );
+    }
+
+    @Test
+    public void testAllowSnapshotsWithParentVersion()
+            throws MojoExecutionException, XMLStreamException, MojoFailureException
+    {
+        mojo.allowSnapshots = true;
+        mojo.parentVersion = "0.0.1-1-impl-SNAPSHOT";
+        mojo.getProject().setParent( new MavenProject()
+        {{
+            setGroupId( "default-group" );
+            setArtifactId( "issue-670-artifact" );
+            setVersion( "0.0.1-1" );
+        }} );
+
+        try ( MockedStatic<PomHelper> pomHelper = mockStatic( PomHelper.class ) )
+        {
+            pomHelper.when( () -> PomHelper.setProjectParentVersion( any(), any() ) )
+                    .thenReturn( true );
+            mojo.update( null );
+        }
+        assertThat( changeRecorder.getChanges(), hasItem( new VersionChange( "default-group",
+                "issue-670-artifact", "0.0.1-1",
+                "0.0.1-1-impl-SNAPSHOT" ) ) );
+    }
 }