diff --git a/internal/chart/v3/chart_test.go b/internal/chart/v3/chart_test.go
index d5d066d9b..554dde2c1 100644
--- a/internal/chart/v3/chart_test.go
+++ b/internal/chart/v3/chart_test.go
@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"helm.sh/helm/v4/pkg/chart/common"
 )
@@ -76,15 +77,12 @@ func TestSaveChartNoRawData(t *testing.T) {
 	}
 
 	is := assert.New(t)
+	req := require.New(t)
 	data, err := json.Marshal(chrt)
-	if err != nil {
-		t.Fatal(err)
-	}
+	req.NoError(err)
 
 	res := &Chart{}
-	if err := json.Unmarshal(data, res); err != nil {
-		t.Fatal(err)
-	}
+	req.NoError(json.Unmarshal(data, res))
 
 	is.Equal([]*common.File(nil), res.Raw)
 }
diff --git a/internal/chart/v3/lint/rules/dependencies_test.go b/internal/chart/v3/lint/rules/dependencies_test.go
index 31fd0ef33..ae5882110 100644
--- a/internal/chart/v3/lint/rules/dependencies_test.go
+++ b/internal/chart/v3/lint/rules/dependencies_test.go
@@ -19,6 +19,9 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	chart "helm.sh/helm/v4/internal/chart/v3"
 	"helm.sh/helm/v4/internal/chart/v3/lint/support"
 	chartutil "helm.sh/helm/v4/internal/chart/v3/util"
@@ -63,17 +66,13 @@ func chartWithBadDependencies() chart.Chart {
 func TestValidateDependencyInChartsDir(t *testing.T) {
 	c := chartWithBadDependencies()
 
-	if err := validateDependencyInChartsDir(&c); err == nil {
-		t.Error("chart should have been flagged for missing deps in chart directory")
-	}
+	assert.Error(t, validateDependencyInChartsDir(&c), "chart should have been flagged for missing deps in chart directory")
 }
 
 func TestValidateDependencyInMetadata(t *testing.T) {
 	c := chartWithBadDependencies()
 
-	if err := validateDependencyInMetadata(&c); err == nil {
-		t.Error("chart should have been flagged for missing deps in chart metadata")
-	}
+	assert.Error(t, validateDependencyInMetadata(&c), "chart should have been flagged for missing deps in chart metadata")
 }
 
 func TestValidateDependenciesUnique(t *testing.T) {
@@ -131,9 +130,7 @@ func TestValidateDependenciesUnique(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		if err := validateDependenciesUnique(&tt.chart); err == nil {
-			t.Error("chart should have been flagged for dependency shadowing")
-		}
+		assert.Error(t, validateDependenciesUnique(&tt.chart), "chart should have been flagged for dependency shadowing")
 	}
 }
 
@@ -141,15 +138,11 @@ func TestDependencies(t *testing.T) {
 	tmp := t.TempDir()
 
 	c := chartWithBadDependencies()
-	err := chartutil.SaveDir(&c, tmp)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, chartutil.SaveDir(&c, tmp))
 	linter := support.Linter{ChartDir: filepath.Join(tmp, c.Metadata.Name)}
 
 	Dependencies(&linter)
-	if l := len(linter.Messages); l != 2 {
-		t.Errorf("expected 2 linter errors for bad chart dependencies. Got %d.", l)
+	if !assert.Len(t, linter.Messages, 2, "expected 2 linter errors for bad chart dependencies") {
 		for i, msg := range linter.Messages {
 			t.Logf("Message: %d, Error: %#v", i, msg)
 		}
diff --git a/internal/chart/v3/lint/rules/values_test.go b/internal/chart/v3/lint/rules/values_test.go
index 470904049..c87607f2d 100644
--- a/internal/chart/v3/lint/rules/values_test.go
+++ b/internal/chart/v3/lint/rules/values_test.go
@@ -22,6 +22,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"helm.sh/helm/v4/internal/test/ensure"
 )
@@ -56,9 +57,7 @@ func TestValidateValuesYamlNotDirectory(t *testing.T) {
 	defer os.Remove(nonExistingValuesFilePath)
 
 	err := validateValuesFileExistence(nonExistingValuesFilePath)
-	if err == nil {
-		t.Error("validateValuesFileExistence to return a linter error, got no error")
-	}
+	assert.Error(t, err, "validateValuesFileExistence to return a linter error, got no error")
 }
 
 func TestValidateValuesFileWellFormed(t *testing.T) {
@@ -67,9 +66,7 @@ func TestValidateValuesFileWellFormed(t *testing.T) {
 	`
 	tmpdir := ensure.TempFile(t, "values.yaml", []byte(badYaml))
 	valfile := filepath.Join(tmpdir, "values.yaml")
-	if err := validateValuesFile(valfile, map[string]any{}, false); err == nil {
-		t.Fatal("expected values file to fail parsing")
-	}
+	require.Error(t, validateValuesFile(valfile, map[string]any{}, false), "expected values file to fail parsing")
 }
 
 func TestValidateValuesFileSchema(t *testing.T) {
@@ -78,9 +75,7 @@ func TestValidateValuesFileSchema(t *testing.T) {
 	createTestingSchema(t, tmpdir)
 
 	valfile := filepath.Join(tmpdir, "values.yaml")
-	if err := validateValuesFile(valfile, map[string]any{}, false); err != nil {
-		t.Fatalf("Failed validation with %s", err)
-	}
+	require.NoError(t, validateValuesFile(valfile, map[string]any{}, false), "Failed validation")
 }
 
 func TestValidateValuesFileSchemaFailure(t *testing.T) {
@@ -91,8 +86,7 @@ func TestValidateValuesFileSchemaFailure(t *testing.T) {
 
 	valfile := filepath.Join(tmpdir, "values.yaml")
 
-	err := validateValuesFile(valfile, map[string]any{}, false)
-	assert.ErrorContains(t, err, "- at '/username': got number, want string")
+	assert.ErrorContains(t, validateValuesFile(valfile, map[string]any{}, false), "- at '/username': got number, want string")
 }
 
 func TestValidateValuesFileSchemaFailureButWithSkipSchemaValidation(t *testing.T) {
@@ -103,10 +97,7 @@ func TestValidateValuesFileSchemaFailureButWithSkipSchemaValidation(t *testing.T
 
 	valfile := filepath.Join(tmpdir, "values.yaml")
 
-	err := validateValuesFile(valfile, map[string]any{}, true)
-	if err != nil {
-		t.Fatal("expected values file to pass parsing because of skipSchemaValidation")
-	}
+	require.NoError(t, validateValuesFile(valfile, map[string]any{}, true), "expected values file to pass parsing because of skipSchemaValidation")
 }
 
 func TestValidateValuesFileSchemaOverrides(t *testing.T) {
@@ -118,9 +109,7 @@ func TestValidateValuesFileSchemaOverrides(t *testing.T) {
 	createTestingSchema(t, tmpdir)
 
 	valfile := filepath.Join(tmpdir, "values.yaml")
-	if err := validateValuesFile(valfile, overrides, false); err != nil {
-		t.Fatalf("Failed validation with %s", err)
-	}
+	require.NoError(t, validateValuesFile(valfile, overrides, false), "Failed validation")
 }
 
 func TestValidateValuesFile(t *testing.T) {
@@ -157,12 +146,10 @@ func TestValidateValuesFile(t *testing.T) {
 
 			err := validateValuesFile(valfile, tt.overrides, false)
 
-			switch {
-			case err != nil && tt.errorMessage == "":
-				t.Errorf("Failed validation with %s", err)
-			case err == nil && tt.errorMessage != "":
-				t.Error("expected values file to fail parsing")
-			case err != nil && tt.errorMessage != "":
+			if tt.errorMessage == "" {
+				require.NoError(t, err, "Failed validation")
+			} else {
+				require.Error(t, err, "expected values file to fail parsing")
 				assert.ErrorContains(t, err, tt.errorMessage, "Failed with unexpected error")
 			}
 		})
@@ -172,8 +159,6 @@ func TestValidateValuesFile(t *testing.T) {
 func createTestingSchema(t *testing.T, dir string) string {
 	t.Helper()
 	schemafile := filepath.Join(dir, "values.schema.json")
-	if err := os.WriteFile(schemafile, []byte(testSchema), 0o700); err != nil {
-		t.Fatalf("Failed to write schema to tmpdir: %s", err)
-	}
+	require.NoError(t, os.WriteFile(schemafile, []byte(testSchema), 0o700), "Failed to write schema to tmpdir")
 	return schemafile
 }
diff --git a/internal/chart/v3/loader/load_test.go b/internal/chart/v3/loader/load_test.go
index 1c5845da6..5caec7815 100644
--- a/internal/chart/v3/loader/load_test.go
+++ b/internal/chart/v3/loader/load_test.go
@@ -31,6 +31,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	chart "helm.sh/helm/v4/internal/chart/v3"
@@ -690,9 +691,7 @@ func verifyChartFileAndTemplate(t *testing.T, c *chart.Chart, name string) {
 			if dep.Templates[0].Name != "templates/alpine-pod.yaml" {
 				t.Errorf("Unexpected template: %s", dep.Templates[0].Name)
 			}
-			if len(dep.Templates[0].Data) == 0 {
-				t.Error("No template data.")
-			}
+			assert.NotEmpty(t, dep.Templates[0].Data, "No template data.")
 			if len(dep.Files) != 1 {
 				t.Fatalf("Expected 1 Files, got %d", len(dep.Files))
 			}
diff --git a/internal/chart/v3/metadata_test.go b/internal/chart/v3/metadata_test.go
index 5f88552e9..91b917980 100644
--- a/internal/chart/v3/metadata_test.go
+++ b/internal/chart/v3/metadata_test.go
@@ -16,8 +16,10 @@ limitations under the License.
 package v3
 
 import (
-	"errors"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestValidate(t *testing.T) {
@@ -192,21 +194,13 @@ func TestValidate(t *testing.T) {
 
 	for _, tt := range tests {
 		result := tt.md.Validate()
-		if !errors.Is(result, tt.err) {
-			t.Errorf("expected %q, got %q in test %q", tt.err, result, tt.name)
-		}
+		assert.ErrorIsf(t, result, tt.err, "expected %q, got %q in test %q", tt.err, result, tt.name)
 	}
 }
 
 func TestValidate_sanitize(t *testing.T) {
 	md := &Metadata{APIVersion: "3", Name: "test", Version: "1.0", Description: "\adescr\u0081iption\rtest", Maintainers: []*Maintainer{{Name: "\r"}}}
-	if err := md.Validate(); err != nil {
-		t.Fatalf("unexpected error: %s", err)
-	}
-	if md.Description != "description test" {
-		t.Fatalf("description was not sanitized: %q", md.Description)
-	}
-	if md.Maintainers[0].Name != " " {
-		t.Fatal("maintainer name was not sanitized")
-	}
+	require.NoError(t, md.Validate())
+	require.Equalf(t, "description test", md.Description, "description was not sanitized: %q", md.Description)
+	require.Equal(t, " ", md.Maintainers[0].Name, "maintainer name was not sanitized")
 }
diff --git a/internal/chart/v3/util/compatible_test.go b/internal/chart/v3/util/compatible_test.go
index e17d33e35..b210d3dd8 100644
--- a/internal/chart/v3/util/compatible_test.go
+++ b/internal/chart/v3/util/compatible_test.go
@@ -17,7 +17,11 @@ limitations under the License.
 // Package version represents the current version of the project.
 package util
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
 
 func TestIsCompatibleRange(t *testing.T) {
 	tests := []struct {
@@ -36,8 +40,6 @@ func TestIsCompatibleRange(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		if IsCompatibleRange(tt.constraint, tt.ver) != tt.expected {
-			t.Errorf("expected constraint %s to be %v for %s", tt.constraint, tt.expected, tt.ver)
-		}
+		assert.Equalf(t, tt.expected, IsCompatibleRange(tt.constraint, tt.ver), "expected constraint %s to be %v for %s", tt.constraint, tt.expected, tt.ver)
 	}
 }
diff --git a/internal/plugin/sign_test.go b/internal/plugin/sign_test.go
index 7e97a82aa..d6fd4c548 100644
--- a/internal/plugin/sign_test.go
+++ b/internal/plugin/sign_test.go
@@ -18,9 +18,11 @@ package plugin
 import (
 	"os"
 	"path/filepath"
-	"strings"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	"helm.sh/helm/v4/pkg/provenance"
 )
 
@@ -28,9 +30,7 @@ func TestSignPlugin(t *testing.T) {
 	// Create a test plugin directory
 	tempDir := t.TempDir()
 	pluginDir := filepath.Join(tempDir, "test-plugin")
-	if err := os.MkdirAll(pluginDir, 0o755); err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, os.MkdirAll(pluginDir, 0o755))
 
 	// Create a plugin.yaml file
 	pluginYAML := `apiVersion: v1
@@ -41,16 +41,12 @@ version: 1.0.0
 runtimeConfig:
   platformCommand:
     - command: echo`
-	if err := os.WriteFile(filepath.Join(pluginDir, "plugin.yaml"), []byte(pluginYAML), 0o644); err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, os.WriteFile(filepath.Join(pluginDir, "plugin.yaml"), []byte(pluginYAML), 0o644))
 
 	// Create a tarball
 	tarballPath := filepath.Join(tempDir, "test-plugin.tgz")
 	tarFile, err := os.Create(tarballPath)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	if err := CreatePluginTarball(pluginDir, "test-plugin", tarFile); err != nil {
 		tarFile.Close()
 		t.Fatal(err)
@@ -60,39 +56,25 @@ runtimeConfig:
 	// Create a test key for signing
 	keyring := "../../pkg/cmd/testdata/helm-test-key.secret"
 	signer, err := provenance.NewFromKeyring(keyring, "helm-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := signer.DecryptKey(func(_ string) ([]byte, error) {
+	require.NoError(t, err)
+	require.NoError(t, signer.DecryptKey(func(_ string) ([]byte, error) {
 		return []byte(""), nil
-	}); err != nil {
-		t.Fatal(err)
-	}
+	}))
 
 	// Read the tarball data
 	tarballData, err := os.ReadFile(tarballPath)
-	if err != nil {
-		t.Fatalf("failed to read tarball: %v", err)
-	}
+	require.NoError(t, err, "failed to read tarball")
 
 	// Sign the plugin tarball
 	sig, err := SignPlugin(tarballData, filepath.Base(tarballPath), signer)
-	if err != nil {
-		t.Fatalf("failed to sign plugin: %v", err)
-	}
+	require.NoError(t, err, "failed to sign plugin")
 
 	// Verify the signature contains the expected content
-	if !strings.Contains(sig, "-----BEGIN PGP SIGNED MESSAGE-----") {
-		t.Error("signature does not contain PGP header")
-	}
+	assert.Contains(t, sig, "-----BEGIN PGP SIGNED MESSAGE-----", "signature does not contain PGP header")
 
 	// Verify the tarball hash is in the signature
 	expectedHash, err := provenance.DigestFile(tarballPath)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	// The signature should contain the tarball hash
-	if !strings.Contains(sig, "sha256:"+expectedHash) {
-		t.Errorf("signature does not contain expected tarball hash: sha256:%s", expectedHash)
-	}
+	assert.Contains(t, sig, "sha256:"+expectedHash, "signature does not contain expected tarball hash: sha256:%s", expectedHash)
 }