Added tests for scheduler/framework/plugins

Signed-off-by: Anuj Agrawal <anujagrawal380@gmail.com>

Added tests for scheduler/framework/plugins

Signed-off-by: Anuj Agrawal <anujagrawal380@gmail.com>

pkg/scheduler/framework/plugins/apienablement/api_enablement_test.go

@@ -0,0 +1,147 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package apienablement
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestAPIEnablement_Filter(t *testing.T) {
+	tests := []struct {
+		name         string
+		bindingSpec  *workv1alpha2.ResourceBindingSpec
+		cluster      *clusterv1alpha1.Cluster
+		expectedCode framework.Code
+		expectError  bool
+	}{
+		{
+			name: "API is enabled in cluster",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Resource: workv1alpha2.ObjectReference{
+					APIVersion: "apps/v1",
+					Kind:       "Deployment",
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+				Status: clusterv1alpha1.ClusterStatus{
+					APIEnablements: []clusterv1alpha1.APIEnablement{
+						{
+							GroupVersion: "apps/v1",
+							Resources: []clusterv1alpha1.APIResource{
+								{
+									Kind: "Deployment",
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+		{
+			name: "API is not enabled in cluster",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Resource: workv1alpha2.ObjectReference{
+					APIVersion: "custom.io/v1",
+					Kind:       "CustomResource",
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+				Status: clusterv1alpha1.ClusterStatus{
+					APIEnablements: []clusterv1alpha1.APIEnablement{
+						{
+							GroupVersion: "apps/v1",
+							Resources: []clusterv1alpha1.APIResource{
+								{
+									Kind: "Deployment",
+								},
+							},
+						},
+					},
+				},
+			},
+			expectedCode: framework.Unschedulable,
+			expectError:  true,
+		},
+		{
+			name: "cluster in target list with incomplete API enablements",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Resource: workv1alpha2.ObjectReference{
+					APIVersion: "custom.io/v1",
+					Kind:       "CustomResource",
+				},
+				Clusters: []workv1alpha2.TargetCluster{
+					{
+						Name: "cluster1",
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+				Status: clusterv1alpha1.ClusterStatus{
+					Conditions: []metav1.Condition{
+						{
+							Type:   clusterv1alpha1.ClusterConditionCompleteAPIEnablements,
+							Status: metav1.ConditionFalse,
+						},
+					},
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+	}
+
+	p := &APIEnablement{}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := p.Filter(context.Background(), tt.bindingSpec, nil, tt.cluster)
+			assert.Equal(t, tt.expectedCode, result.Code())
+			assert.Equal(t, tt.expectError, result.AsError() != nil)
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*APIEnablement)
+	assert.True(t, ok)
+}
+
+func TestAPIEnablement_Name(t *testing.T) {
+	p := &APIEnablement{}
+	assert.Equal(t, Name, p.Name())
+}

pkg/scheduler/framework/plugins/clusteraffinity/cluster_affinity_test.go

@@ -0,0 +1,160 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package clusteraffinity
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestClusterAffinity_Filter(t *testing.T) {
+	tests := []struct {
+		name          string
+		bindingSpec   *workv1alpha2.ResourceBindingSpec
+		bindingStatus *workv1alpha2.ResourceBindingStatus
+		cluster       *clusterv1alpha1.Cluster
+		expectedCode  framework.Code
+		expectError   bool
+	}{
+		{
+			name: "matching affinity",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					ClusterAffinity: &policyv1alpha1.ClusterAffinity{
+						ClusterNames: []string{"cluster1"},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+		{
+			name: "non-matching affinity",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					ClusterAffinity: &policyv1alpha1.ClusterAffinity{
+						ClusterNames: []string{"cluster2"},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Unschedulable,
+			expectError:  true,
+		},
+		{
+			name: "matching affinity from ClusterAffinities",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					ClusterAffinities: []policyv1alpha1.ClusterAffinityTerm{
+						{
+							AffinityName: "affinity1",
+							ClusterAffinity: policyv1alpha1.ClusterAffinity{
+								ClusterNames: []string{"cluster1"},
+							},
+						},
+					},
+				},
+			},
+			bindingStatus: &workv1alpha2.ResourceBindingStatus{
+				SchedulerObservedAffinityName: "affinity1",
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+		{
+			name: "no affinity specified",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+	}
+
+	p := &ClusterAffinity{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := p.Filter(context.Background(), tt.bindingSpec, tt.bindingStatus, tt.cluster)
+			assert.Equal(t, tt.expectedCode, result.Code())
+			assert.Equal(t, tt.expectError, result.AsError() != nil)
+		})
+	}
+}
+
+func TestClusterAffinity_Score(t *testing.T) {
+	p := &ClusterAffinity{}
+	spec := &workv1alpha2.ResourceBindingSpec{}
+	cluster := &clusterv1alpha1.Cluster{}
+
+	score, result := p.Score(context.Background(), spec, cluster)
+
+	assert.Equal(t, framework.MinClusterScore, score)
+	assert.Equal(t, framework.Success, result.Code())
+}
+
+func TestClusterAffinity_ScoreExtensions(t *testing.T) {
+	p := &ClusterAffinity{}
+	assert.Equal(t, p, p.ScoreExtensions())
+}
+
+func TestClusterAffinity_NormalizeScore(t *testing.T) {
+	p := &ClusterAffinity{}
+	result := p.NormalizeScore(context.Background(), nil)
+	assert.Equal(t, framework.Success, result.Code())
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*ClusterAffinity)
+	assert.True(t, ok)
+}
+
+func TestClusterAffinity_Name(t *testing.T) {
+	p := &ClusterAffinity{}
+	assert.Equal(t, Name, p.Name())
+}

pkg/scheduler/framework/plugins/clustereviction/cluster_eviction_test.go

@@ -0,0 +1,107 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package clustereviction
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestClusterEviction_Filter(t *testing.T) {
+	tests := []struct {
+		name         string
+		bindingSpec  *workv1alpha2.ResourceBindingSpec
+		cluster      *clusterv1alpha1.Cluster
+		expectedCode framework.Code
+		expectError  bool
+	}{
+		{
+			name: "cluster is in graceful eviction tasks",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				GracefulEvictionTasks: []workv1alpha2.GracefulEvictionTask{
+					{
+						FromCluster: "cluster1",
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Unschedulable,
+			expectError:  true,
+		},
+		{
+			name: "cluster is not in graceful eviction tasks",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				GracefulEvictionTasks: []workv1alpha2.GracefulEvictionTask{
+					{
+						FromCluster: "cluster2",
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+		{
+			name:        "no graceful eviction tasks",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+			expectError:  false,
+		},
+	}
+
+	p := &ClusterEviction{}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := p.Filter(context.Background(), tt.bindingSpec, nil, tt.cluster)
+			assert.Equal(t, tt.expectedCode, result.Code())
+			assert.Equal(t, tt.expectError, result.AsError() != nil)
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*ClusterEviction)
+	assert.True(t, ok)
+}
+
+func TestClusterEviction_Name(t *testing.T) {
+	p := &ClusterEviction{}
+	assert.Equal(t, Name, p.Name())
+}

pkg/scheduler/framework/plugins/clusterlocality/cluster_locality_test.go

@@ -0,0 +1,109 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package clusterlocality
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestClusterLocality_Score(t *testing.T) {
+	tests := []struct {
+		name          string
+		bindingSpec   *workv1alpha2.ResourceBindingSpec
+		cluster       *clusterv1alpha1.Cluster
+		expectedScore int64
+	}{
+		{
+			name: "no clusters in spec",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Clusters: []workv1alpha2.TargetCluster{},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedScore: framework.MinClusterScore,
+		},
+		{
+			name: "cluster in spec",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Clusters: []workv1alpha2.TargetCluster{
+					{Name: "cluster1"},
+					{Name: "cluster2"},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedScore: framework.MaxClusterScore,
+		},
+		{
+			name: "cluster not in spec",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Clusters: []workv1alpha2.TargetCluster{
+					{Name: "cluster2"},
+					{Name: "cluster3"},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedScore: framework.MinClusterScore,
+		},
+	}
+
+	p := &ClusterLocality{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			score, result := p.Score(context.Background(), tt.bindingSpec, tt.cluster)
+			assert.Equal(t, tt.expectedScore, score)
+			assert.Equal(t, framework.Success, result.Code())
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*ClusterLocality)
+	assert.True(t, ok)
+}
+
+func TestClusterLocality_Name(t *testing.T) {
+	p := &ClusterLocality{}
+	assert.Equal(t, Name, p.Name())
+}
+
+func TestClusterLocality_ScoreExtensions(t *testing.T) {
+	p := &ClusterLocality{}
+	assert.Nil(t, p.ScoreExtensions())
+}

pkg/scheduler/framework/plugins/spreadconstraint/spread_constraint_test.go

@@ -0,0 +1,160 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package spreadconstraint
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestSpreadConstraint_Filter(t *testing.T) {
+	tests := []struct {
+		name           string
+		bindingSpec    *workv1alpha2.ResourceBindingSpec
+		cluster        *clusterv1alpha1.Cluster
+		expectedCode   framework.Code
+		expectedReason string
+	}{
+		{
+			name: "no spread constraints",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{},
+			},
+			cluster:      &clusterv1alpha1.Cluster{},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "spread by provider - provider present",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldProvider},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				Spec: clusterv1alpha1.ClusterSpec{
+					Provider: "aws",
+				},
+			},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "spread by provider - provider missing",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldProvider},
+					},
+				},
+			},
+			cluster:        &clusterv1alpha1.Cluster{},
+			expectedCode:   framework.Unschedulable,
+			expectedReason: "cluster(s) did not have provider property",
+		},
+		{
+			name: "spread by region - region present",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldRegion},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				Spec: clusterv1alpha1.ClusterSpec{
+					Region: "us-west-2",
+				},
+			},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "spread by region - region missing",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldRegion},
+					},
+				},
+			},
+			cluster:        &clusterv1alpha1.Cluster{},
+			expectedCode:   framework.Unschedulable,
+			expectedReason: "cluster(s) did not have region property",
+		},
+		{
+			name: "spread by zone - zones present",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldZone},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				Spec: clusterv1alpha1.ClusterSpec{
+					Zones: []string{"us-west-2a"},
+				},
+			},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "spread by zone - zones missing",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					SpreadConstraints: []policyv1alpha1.SpreadConstraint{
+						{SpreadByField: policyv1alpha1.SpreadByFieldZone},
+					},
+				},
+			},
+			cluster:        &clusterv1alpha1.Cluster{},
+			expectedCode:   framework.Unschedulable,
+			expectedReason: "cluster(s) did not have zones property",
+		},
+	}
+
+	p := &SpreadConstraint{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := p.Filter(context.Background(), tt.bindingSpec, nil, tt.cluster)
+			assert.Equal(t, tt.expectedCode, result.Code())
+			if tt.expectedReason != "" {
+				assert.Contains(t, result.AsError().Error(), tt.expectedReason)
+			}
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*SpreadConstraint)
+	assert.True(t, ok)
+}
+
+func TestSpreadConstraint_Name(t *testing.T) {
+	p := &SpreadConstraint{}
+	assert.Equal(t, Name, p.Name())
+}

pkg/scheduler/framework/plugins/tainttoleration/taint_toleration_test.go

@@ -0,0 +1,135 @@
+/*
+Copyright 2024 The Karmada Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package tainttoleration
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
+	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
+	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
+	"github.com/karmada-io/karmada/pkg/scheduler/framework"
+)
+
+func TestTaintToleration_Filter(t *testing.T) {
+	tests := []struct {
+		name           string
+		bindingSpec    *workv1alpha2.ResourceBindingSpec
+		cluster        *clusterv1alpha1.Cluster
+		expectedCode   framework.Code
+		expectedReason string
+	}{
+		{
+			name: "cluster already in target clusters",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Clusters: []workv1alpha2.TargetCluster{
+					{Name: "cluster1"},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "cluster1",
+				},
+			},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "no taints",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{},
+			},
+			cluster:      &clusterv1alpha1.Cluster{},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "tolerated taint",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{
+					ClusterTolerations: []corev1.Toleration{
+						{
+							Key:      "key1",
+							Operator: corev1.TolerationOpEqual,
+							Value:    "value1",
+							Effect:   corev1.TaintEffectNoSchedule,
+						},
+					},
+				},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				Spec: clusterv1alpha1.ClusterSpec{
+					Taints: []corev1.Taint{
+						{
+							Key:    "key1",
+							Value:  "value1",
+							Effect: corev1.TaintEffectNoSchedule,
+						},
+					},
+				},
+			},
+			expectedCode: framework.Success,
+		},
+		{
+			name: "untolerated taint",
+			bindingSpec: &workv1alpha2.ResourceBindingSpec{
+				Placement: &policyv1alpha1.Placement{},
+			},
+			cluster: &clusterv1alpha1.Cluster{
+				Spec: clusterv1alpha1.ClusterSpec{
+					Taints: []corev1.Taint{
+						{
+							Key:    "key1",
+							Value:  "value1",
+							Effect: corev1.TaintEffectNoSchedule,
+						},
+					},
+				},
+			},
+			expectedCode:   framework.Unschedulable,
+			expectedReason: "cluster(s) had untolerated taint {key1=value1:NoSchedule}",
+		},
+	}
+
+	p := &TaintToleration{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := p.Filter(context.Background(), tt.bindingSpec, nil, tt.cluster)
+			assert.Equal(t, tt.expectedCode, result.Code())
+			if tt.expectedReason != "" {
+				assert.Contains(t, result.AsError().Error(), tt.expectedReason)
+			}
+		})
+	}
+}
+
+func TestNew(t *testing.T) {
+	plugin, err := New()
+	assert.NoError(t, err)
+	assert.NotNil(t, plugin)
+	_, ok := plugin.(*TaintToleration)
+	assert.True(t, ok)
+}
+
+func TestTaintToleration_Name(t *testing.T) {
+	p := &TaintToleration{}
+	assert.Equal(t, Name, p.Name())
+}