diff --git a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.test.js b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.test.js
index f18a1ea86e..c6b24344cb 100644
--- a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.test.js
+++ b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineContainerWidget.test.js
@@ -40,3 +40,6 @@ QUnit.test( 'Basic functionality', ( assert ) => {
 	widget.clear();
 	assert.deepEqual( widget.partWidgets, {} );
 } );
+
+// TODO: addPartWidget() with different positions.
+// TODO: onTransclusionModelChange() is complex and fragile and must be tested.
diff --git a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineParameterWidget.test.js b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineParameterWidget.test.js
index 10930a9645..fabea0a1fd 100644
--- a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineParameterWidget.test.js
+++ b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineParameterWidget.test.js
@@ -1,25 +1,28 @@
 QUnit.module( 've.ui.MWTransclusionOutlineParameterWidget' );
 
 QUnit.test( 'interprets param with no attributes', ( assert ) => {
-	const layout = new ve.ui.MWTransclusionOutlineParameterWidget( {} );
+	const widget = new ve.ui.MWTransclusionOutlineParameterWidget( {} );
 
-	assert.strictEqual( layout.checkbox.isDisabled(), false );
-	assert.strictEqual( layout.checkbox.isSelected(), false );
-	assert.strictEqual( layout.checkbox.getTitle(), null );
+	assert.strictEqual( widget.checkbox.isDisabled(), false );
+	assert.strictEqual( widget.checkbox.isSelected(), false );
+	assert.strictEqual( widget.checkbox.getTitle(), null );
 } );
 
 QUnit.test( 'interprets required param', ( assert ) => {
-	const layout = new ve.ui.MWTransclusionOutlineParameterWidget( { required: true } );
+	const widget = new ve.ui.MWTransclusionOutlineParameterWidget( { required: true } );
 
-	assert.strictEqual( layout.checkbox.isDisabled(), true );
-	assert.strictEqual( layout.checkbox.isSelected(), true );
-	assert.notStrictEqual( layout.checkbox.getTitle(), null );
+	assert.strictEqual( widget.checkbox.isDisabled(), true );
+	assert.strictEqual( widget.checkbox.isSelected(), true );
+	assert.strictEqual(
+		widget.checkbox.getTitle(),
+		'visualeditor-dialog-transclusion-required-parameter'
+	);
 } );
 
 QUnit.test( 'interprets selected param', ( assert ) => {
-	const layout = new ve.ui.MWTransclusionOutlineParameterWidget( { selected: true } );
+	const widget = new ve.ui.MWTransclusionOutlineParameterWidget( { selected: true } );
 
-	assert.strictEqual( layout.checkbox.isDisabled(), false );
-	assert.strictEqual( layout.checkbox.isSelected(), true );
-	assert.strictEqual( layout.checkbox.getTitle(), null );
+	assert.strictEqual( widget.checkbox.isDisabled(), false );
+	assert.strictEqual( widget.checkbox.isSelected(), true );
+	assert.strictEqual( widget.checkbox.getTitle(), null );
 } );
diff --git a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineTemplateWidget.test.js b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineTemplateWidget.test.js
index 7228256a69..79a389474a 100644
--- a/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineTemplateWidget.test.js
+++ b/modules/ve-mw/tests/ui/widgets/ve.ui.MWTransclusionOutlineTemplateWidget.test.js
@@ -11,3 +11,59 @@ QUnit.test( 'Constructor', ( assert ) => {
 		'Example'
 	);
 } );
+
+// TODO: insertCheckboxAtCanonicalPosition() is complex and fragile and must be tested.
+
+QUnit.test( 'filterParameters() on an empty template', ( assert ) => {
+	const transclusion = new ve.dm.MWTransclusionModel(),
+		template = new ve.dm.MWTemplateModel( transclusion, {} ),
+		widget = new ve.ui.MWTransclusionOutlineTemplateWidget( template );
+
+	let eventsFired = 0;
+	widget.connect( this, {
+		filterParameters: ( visibility ) => {
+			assert.deepEqual( visibility, {} );
+			eventsFired++;
+		}
+	} );
+
+	widget.filterParameters( '' );
+	assert.strictEqual( widget.infoWidget.isVisible(), true );
+	assert.strictEqual( eventsFired, 1 );
+} );
+
+QUnit.test( 'filterParameters() considers everything from the spec', ( assert ) => {
+	const transclusion = new ve.dm.MWTransclusionModel(),
+		template = ve.dm.MWTemplateModel.newFromData( transclusion, {
+			target: {},
+			params: { a: {}, b: {}, c: {}, d: {}, e: {} }
+		} ),
+		widget = new ve.ui.MWTransclusionOutlineTemplateWidget( template );
+
+	template.getSpec().setTemplateData( {
+		params: {
+			c: { label: 'Contains a' },
+			d: { description: 'Contains a' },
+			e: { aliases: [ 'Contains a' ] },
+			f: { label: 'Also contains a, but is not used in the template' }
+		}
+	} );
+
+	let eventsFired = 0;
+	widget.connect( this, {
+		filterParameters: ( visibility ) => {
+			assert.deepEqual( visibility, {
+				'part_0/a': true,
+				'part_0/b': false,
+				'part_0/c': true,
+				'part_0/d': true,
+				'part_0/e': true
+			} );
+			eventsFired++;
+		}
+	} );
+
+	widget.filterParameters( ' A ' );
+	assert.strictEqual( widget.infoWidget.isVisible(), false );
+	assert.strictEqual( eventsFired, 1 );
+} );