refactor: extract repeated string literals into constants

- Add tokenParam const in jenkins.go and reuse across main.go
- Add shared test_helpers_test.go with test constants
- Remove unused //nolint:gosec directive in jenkins.go
- Resolve golangci-lint v2.12 goconst and nolintlint warnings

.github/workflows/docker.yml

@@ -10,6 +10,11 @@ on:
     branches:
       - "master"
 
+permissions:
+  contents: read
+  packages: write
+  security-events: write
+
 jobs:
   build-docker:
     runs-on: ubuntu-latest
@@ -18,6 +23,7 @@ jobs:
         uses: actions/setup-go@v6
         with:
           go-version: "^1"
+          check-latest: true
       - name: Checkout repository
         uses: actions/checkout@v6
         with:
@@ -29,13 +35,13 @@ jobs:
           make build_linux_arm64
 
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -43,7 +49,7 @@ jobs:
 
       - name: Docker meta
         id: docker-meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ghcr.io/${{ github.repository }}
@@ -53,8 +59,33 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
 
+      - name: Build image for scanning
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/amd64
+          push: false
+          load: true
+          tags: drone-jenkins:scan
+
+      - name: Run Trivy vulnerability scanner
+        uses: aquasecurity/trivy-action@v0.36.0
+        with:
+          image-ref: "drone-jenkins:scan"
+          format: "sarif"
+          output: "trivy-image-results.sarif"
+          severity: "CRITICAL,HIGH"
+          exit-code: '1'
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v4
+        if: always()
+        with:
+          sarif_file: "trivy-image-results.sarif"
+          category: "trivy-docker-image"
+
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           platforms: linux/amd64,linux/arm64

.github/workflows/goreleaser.yml

@@ -23,7 +23,7 @@ jobs:
           check-latest: true
 
       - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v6
+        uses: goreleaser/goreleaser-action@v7
         with:
           # either 'goreleaser' (default) or 'goreleaser-pro'
           distribution: goreleaser

.github/workflows/lint.yml

@@ -12,13 +12,14 @@ jobs:
         uses: actions/setup-go@v6
         with:
           go-version: "stable"
+          check-latest: true
       - name: Checkout repository
         uses: actions/checkout@v6
 
       - name: Setup golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.6
+          version: v2.12
           args: --verbose
 
       - uses: hadolint/hadolint-action@v3.3.0
@@ -30,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: ["1.25"]
+        go: ["1.25", "1.26"]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build
@@ -44,6 +45,7 @@ jobs:
         uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go }}
+          check-latest: true
 
       - name: Checkout Code
         uses: actions/checkout@v6
@@ -63,6 +65,6 @@ jobs:
           go test -race -cover -coverprofile=coverage.out ./...
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           flags: ${{ matrix.os }},go-${{ matrix.go }}

.github/workflows/trivy.yml

@@ -10,47 +10,76 @@ on:
   schedule:
     # Run daily at 00:00 UTC
     - cron: "0 0 * * *"
-  workflow_dispatch: # Allow manual trigger
+  workflow_dispatch:
 
 permissions:
   contents: read
-  security-events: write # Required for uploading SARIF results
+  security-events: write
 
 jobs:
-  trivy-scan:
-    name: Trivy Security Scan
+  trivy-repo-scan:
+    name: Trivy Repository Scan
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout code
+      - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
 
-      - name: Run Trivy vulnerability scanner (source code)
-        uses: aquasecurity/trivy-action@0.33.1
+      - name: Run Trivy vulnerability scanner (repo)
+        uses: aquasecurity/trivy-action@v0.36.0
         with:
           scan-type: "fs"
           scan-ref: "."
-          scanners: "vuln,secret,misconfig"
           format: "sarif"
-          output: "trivy-results.sarif"
-          severity: "CRITICAL,HIGH,MEDIUM"
-          ignore-unfixed: true
+          output: "trivy-repo-results.sarif"
+          severity: "CRITICAL,HIGH"
 
-      - name: Upload Trivy results to GitHub Security tab
+      - name: Upload Trivy scan results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@v4
         if: always()
         with:
-          sarif_file: "trivy-results.sarif"
+          sarif_file: "trivy-repo-results.sarif"
 
-      - name: Run Trivy scanner (table output for logs)
-        uses: aquasecurity/trivy-action@0.33.1
+  trivy-image-scan:
+    name: Trivy Image Scan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          check-latest: true
+
+      - name: Build binary
+        run: |
+          make build_linux_amd64
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Build Docker image for scanning
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/amd64
+          push: false
+          load: true
+          tags: drone-jenkins:scan
+
+      - name: Run Trivy vulnerability scanner (image)
+        uses: aquasecurity/trivy-action@v0.36.0
+        with:
+          image-ref: "drone-jenkins:scan"
+          format: "sarif"
+          output: "trivy-image-results.sarif"
+          severity: "CRITICAL,HIGH"
+
+      - name: Upload Trivy image scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v4
         if: always()
         with:
-          scan-type: "fs"
-          scan-ref: "."
-          scanners: "vuln,secret,misconfig"
-          format: "table"
-          severity: "CRITICAL,HIGH,MEDIUM"
-          ignore-unfixed: true
-          exit-code: "1"
+          sarif_file: "trivy-image-results.sarif"
+          category: "trivy-image"

go.mod

@@ -1,6 +1,6 @@
 module github.com/appleboy/drone-jenkins
 
-go 1.24.0
+go 1.25.10
 
 require (
 	github.com/appleboy/com v1.1.1

jenkins.go

@@ -19,6 +19,8 @@ import (
 	"github.com/yassinebenaid/godump"
 )
 
+const tokenParam = "token"
+
 type (
 	// Auth contain username and token
 	Auth struct {
@@ -487,14 +489,14 @@ func (jenkins *Jenkins) trigger(ctx context.Context, job string, params url.Valu
 		if params == nil {
 			params = url.Values{}
 		}
-		params.Set("token", jenkins.Token)
+		params.Set(tokenParam, jenkins.Token)
 	}
 
 	var urlPath string
 	// Check if params contains build parameters (excluding 'token')
 	hasBuildParams := false
 	for key := range params {
-		if key != "token" {
+		if key != tokenParam {
 			hasBuildParams = true
 			break
 		}
@@ -524,7 +526,7 @@ func (jenkins *Jenkins) trigger(ctx context.Context, job string, params url.Valu
 			// Create a copy of params with masked token for display
 			displayParams := url.Values{}
 			for key, values := range params {
-				if key == "token" {
+				if key == tokenParam {
 					// Mask token values for security
 					displayParams[key] = []string{"***MASKED***"}
 				} else {

jenkins_test.go

@@ -22,7 +22,7 @@ func TestParseJobPath(t *testing.T) {
 	jenkins, err := NewJenkins(
 		context.Background(),
 		auth,
-		"http://example.com",
+		testExampleURL,
 		"",
 		false,
 		"",
@@ -38,8 +38,8 @@ func TestParseJobPath(t *testing.T) {
 
 func TestUnSupportProtocol(t *testing.T) {
 	auth := &Auth{
-		Username: "foo",
-		Token:    "bar",
+		Username: testUserFoo,
+		Token:    testUserBar,
 	}
 	jenkins, err := NewJenkins(context.Background(), auth, "example.com", "", false, "", false)
 	assert.NoError(t, err)
@@ -60,8 +60,8 @@ func TestTriggerBuild(t *testing.T) {
 	defer server.Close()
 
 	auth := &Auth{
-		Username: "foo",
-		Token:    "bar",
+		Username: testUserFoo,
+		Token:    testUserBar,
 	}
 	jenkins, err := NewJenkins(
 		context.Background(),
@@ -129,8 +129,8 @@ func TestPostAndGetLocation(t *testing.T) {
 			defer server.Close()
 
 			auth := &Auth{
-				Username: "test",
-				Token:    "test",
+				Username: testUserName,
+				Token:    testUserName,
 			}
 			jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 			assert.NoError(t, err)
@@ -206,8 +206,8 @@ func TestGetQueueItem(t *testing.T) {
 			defer server.Close()
 
 			auth := &Auth{
-				Username: "test",
-				Token:    "test",
+				Username: testUserName,
+				Token:    testUserName,
 			}
 			jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 			assert.NoError(t, err)
@@ -242,7 +242,7 @@ func TestGetBuildInfo(t *testing.T) {
 	}{
 		{
 			name:        "build in progress",
-			jobName:     "test-job",
+			jobName:     testJobName,
 			buildNumber: 123,
 			responseBody: `{"number":123,"building":true,"duration":0,"result":null,` +
 				`"url":"http://jenkins.example.com/job/test-job/123/"}`,
@@ -253,7 +253,7 @@ func TestGetBuildInfo(t *testing.T) {
 		},
 		{
 			name:        "build completed successfully",
-			jobName:     "test-job",
+			jobName:     testJobName,
 			buildNumber: 124,
 			responseBody: `{"number":124,"building":false,"duration":5000,"result":"SUCCESS",` +
 				`"url":"http://jenkins.example.com/job/test-job/124/"}`,
@@ -264,7 +264,7 @@ func TestGetBuildInfo(t *testing.T) {
 		},
 		{
 			name:        "build failed",
-			jobName:     "test-job",
+			jobName:     testJobName,
 			buildNumber: 125,
 			responseBody: `{"number":125,"building":false,"duration":3000,"result":"FAILURE",` +
 				`"url":"http://jenkins.example.com/job/test-job/125/"}`,
@@ -275,7 +275,7 @@ func TestGetBuildInfo(t *testing.T) {
 		},
 		{
 			name:           "build not found",
-			jobName:        "test-job",
+			jobName:        testJobName,
 			buildNumber:    999,
 			responseBody:   "Not Found",
 			responseStatus: http.StatusNotFound,
@@ -295,8 +295,8 @@ func TestGetBuildInfo(t *testing.T) {
 			defer server.Close()
 
 			auth := &Auth{
-				Username: "test",
-				Token:    "test",
+				Username: testUserName,
+				Token:    testUserName,
 			}
 			jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 			assert.NoError(t, err)
@@ -347,22 +347,26 @@ func TestWaitForCompletion(t *testing.T) {
 						[]byte(`{"number":456,"building":true,"duration":0,"result":null}`),
 					)
 				} else {
-					_, _ = w.Write([]byte(`{"number":456,"building":false,"duration":5000,"result":"SUCCESS"}`))
+					_, _ = w.Write(
+						[]byte(
+							`{"number":456,"building":false,"duration":5000,"result":"SUCCESS"}`,
+						),
+					)
 				}
 			}
 		}))
 		defer server.Close()
 
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 		assert.NoError(t, err)
 
 		buildInfo, err := jenkins.waitForCompletion(
 			context.Background(),
-			"test-job",
+			testJobName,
 			queueID,
 			100*time.Millisecond,
 			5*time.Second,
@@ -388,15 +392,15 @@ func TestWaitForCompletion(t *testing.T) {
 		defer server.Close()
 
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 		assert.NoError(t, err)
 
 		buildInfo, err := jenkins.waitForCompletion(
 			context.Background(),
-			"test-job",
+			testJobName,
 			queueID,
 			50*time.Millisecond,
 			200*time.Millisecond,
@@ -430,15 +434,15 @@ func TestWaitForCompletion(t *testing.T) {
 		defer server.Close()
 
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 		assert.NoError(t, err)
 
 		buildInfo, err := jenkins.waitForCompletion(
 			context.Background(),
-			"test-job",
+			testJobName,
 			queueID,
 			50*time.Millisecond,
 			200*time.Millisecond,
@@ -470,22 +474,26 @@ func TestWaitForCompletion(t *testing.T) {
 						[]byte(`{"number":456,"building":true,"duration":0,"result":null}`),
 					)
 				} else {
-					_, _ = w.Write([]byte(`{"number":456,"building":false,"duration":3000,"result":"FAILURE"}`))
+					_, _ = w.Write(
+						[]byte(
+							`{"number":456,"building":false,"duration":3000,"result":"FAILURE"}`,
+						),
+					)
 				}
 			}
 		}))
 		defer server.Close()
 
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(context.Background(), auth, server.URL, "", false, "", false)
 		assert.NoError(t, err)
 
 		buildInfo, err := jenkins.waitForCompletion(
 			context.Background(),
-			"test-job",
+			testJobName,
 			queueID,
 			50*time.Millisecond,
 			5*time.Second,
@@ -618,8 +626,8 @@ func TestLoadCACert(t *testing.T) {
 func TestNewJenkinsWithCACert(t *testing.T) {
 	t.Run("with valid CA certificate", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(
 			context.Background(),
@@ -642,8 +650,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 		assert.NoError(t, err)
 
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(
 			context.Background(),
@@ -660,8 +668,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 
 	t.Run("with invalid CA certificate content", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(
 			context.Background(),
@@ -679,8 +687,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 
 	t.Run("with invalid PEM format", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		invalidPEM := "-----BEGIN CERTIFICATE-----\ninvalid-base64-data\n-----END CERTIFICATE-----"
 		jenkins, err := NewJenkins(
@@ -699,8 +707,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 
 	t.Run("with nonexistent file path", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(
 			context.Background(),
@@ -718,8 +726,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 
 	t.Run("insecure flag takes precedence over CA cert", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		// When insecure is true, CA cert should be ignored
 		jenkins, err := NewJenkins(
@@ -737,8 +745,8 @@ func TestNewJenkinsWithCACert(t *testing.T) {
 
 	t.Run("without CA certificate uses default client", func(t *testing.T) {
 		auth := &Auth{
-			Username: "test",
-			Token:    "test",
+			Username: testUserName,
+			Token:    testUserName,
 		}
 		jenkins, err := NewJenkins(
 			context.Background(),

main.go

@@ -71,7 +71,7 @@ func main() {
 			EnvVars: []string{"PLUGIN_USER", "JENKINS_USER", "INPUT_USER"},
 		},
 		&cli.StringFlag{
-			Name:    "token",
+			Name:    tokenParam,
 			Aliases: []string{"t"},
 			Usage:   "jenkins API token for authentication",
 			EnvVars: []string{"PLUGIN_TOKEN", "JENKINS_TOKEN", "INPUT_TOKEN"},
@@ -175,7 +175,7 @@ func run(c *cli.Context) error {
 	}
 
 	// Validate authentication: either (user + token) or remote-token must be provided
-	hasUserAuth := c.String("user") != "" && c.String("token") != ""
+	hasUserAuth := c.String("user") != "" && c.String(tokenParam) != ""
 	hasRemoteToken := c.String("remote-token") != ""
 
 	if !hasUserAuth && !hasRemoteToken {
@@ -185,7 +185,7 @@ func run(c *cli.Context) error {
 	plugin := Plugin{
 		BaseURL:      c.String("host"),
 		Username:     c.String("user"),
-		Token:        c.String("token"),
+		Token:        c.String(tokenParam),
 		RemoteToken:  c.String("remote-token"),
 		Job:          c.StringSlice("job"),
 		Insecure:     c.Bool("insecure"),

plugin_test.go

@@ -34,53 +34,53 @@ func TestValidateConfig(t *testing.T) {
 		{
 			name: "missing authentication",
 			plugin: Plugin{
-				BaseURL: "http://example.com",
+				BaseURL: testExampleURL,
 			},
 			wantError: true,
-			errorMsg:  "authentication required",
+			errorMsg:  testAuthRequiredErr,
 		},
 		{
 			name: "missing token (only username)",
 			plugin: Plugin{
-				BaseURL:  "http://example.com",
-				Username: "foo",
+				BaseURL:  testExampleURL,
+				Username: testUserFoo,
 			},
 			wantError: true,
-			errorMsg:  "authentication required",
+			errorMsg:  testAuthRequiredErr,
 		},
 		{
 			name: "missing username (only token)",
 			plugin: Plugin{
-				BaseURL: "http://example.com",
-				Token:   "bar",
+				BaseURL: testExampleURL,
+				Token:   testUserBar,
 			},
 			wantError: true,
-			errorMsg:  "authentication required",
+			errorMsg:  testAuthRequiredErr,
 		},
 		{
 			name: "user and token auth",
 			plugin: Plugin{
-				BaseURL:  "http://example.com",
-				Username: "foo",
-				Token:    "bar",
+				BaseURL:  testExampleURL,
+				Username: testUserFoo,
+				Token:    testUserBar,
 			},
 			wantError: false,
 		},
 		{
 			name: "remote token auth",
 			plugin: Plugin{
-				BaseURL:     "http://example.com",
-				RemoteToken: "remote-token-123",
+				BaseURL:     testExampleURL,
+				RemoteToken: testRemoteTokenValue,
 			},
 			wantError: false,
 		},
 		{
 			name: "both auth methods",
 			plugin: Plugin{
-				BaseURL:     "http://example.com",
-				Username:    "foo",
-				Token:       "bar",
-				RemoteToken: "remote-token-123",
+				BaseURL:     testExampleURL,
+				Username:    testUserFoo,
+				Token:       testUserBar,
+				RemoteToken: testRemoteTokenValue,
 			},
 			wantError: false,
 		},
@@ -118,7 +118,7 @@ func TestTrimWhitespaceFromSlice(t *testing.T) {
 		},
 		{
 			name:     "all whitespace",
-			input:    []string{"   ", "\t", "\n"},
+			input:    []string{testWhitespaceVal, "\t", "\n"},
 			expected: []string{},
 		},
 		{
@@ -129,12 +129,12 @@ func TestTrimWhitespaceFromSlice(t *testing.T) {
 		{
 			name:     "trim surrounding whitespace",
 			input:    []string{"  foo  ", " bar ", "baz"},
-			expected: []string{"foo", "bar", "baz"},
+			expected: []string{testUserFoo, testUserBar, "baz"},
 		},
 		{
 			name:     "mixed empty and valid",
-			input:    []string{"", "valid", "", "also-valid", ""},
-			expected: []string{"valid", "also-valid"},
+			input:    []string{"", testValidStr, "", "also-valid", ""},
+			expected: []string{testValidStr, "also-valid"},
 		},
 	}
 
@@ -157,29 +157,29 @@ func TestParseParameters(t *testing.T) {
 			name:  "valid parameters",
 			input: "key1=value1\nkey2=value2",
 			expected: url.Values{
-				"key1": []string{"value1"},
-				"key2": []string{"value2"},
+				testParamKey1: []string{testParamValue1},
+				testParamKey2: []string{testParamValue2},
 			},
 		},
 		{
 			name:  "parameter with multiple equals signs",
 			input: "key=value=with=equals",
 			expected: url.Values{
-				"key": []string{"value=with=equals"},
+				testParamKey: []string{"value=with=equals"},
 			},
 		},
 		{
 			name:  "parameter with spaces in value",
 			input: "key=value with spaces",
 			expected: url.Values{
-				"key": []string{"value with spaces"},
+				testParamKey: []string{"value with spaces"},
 			},
 		},
 		{
 			name:  "parameter with empty value",
 			input: "key=",
 			expected: url.Values{
-				"key": []string{""},
+				testParamKey: []string{""},
 			},
 		},
 		{
@@ -196,15 +196,15 @@ func TestParseParameters(t *testing.T) {
 			name:  "mixed valid and invalid",
 			input: "valid=yes\ninvalid\nalso=valid",
 			expected: url.Values{
-				"valid": []string{"yes"},
-				"also":  []string{"valid"},
+				testValidStr: []string{"yes"},
+				"also":       []string{testValidStr},
 			},
 		},
 		{
 			name:  "key with surrounding whitespace",
 			input: "  key  =value",
 			expected: url.Values{
-				"key": []string{"value"},
+				testParamKey: []string{"value"},
 			},
 		},
 		{
@@ -216,16 +216,16 @@ func TestParseParameters(t *testing.T) {
 			name:  "multiple empty lines",
 			input: "key1=value1\n\n\nkey2=value2",
 			expected: url.Values{
-				"key1": []string{"value1"},
-				"key2": []string{"value2"},
+				testParamKey1: []string{testParamValue1},
+				testParamKey2: []string{testParamValue2},
 			},
 		},
 		{
 			name:  "lines with whitespace only",
 			input: "key1=value1\n   \n\t\nkey2=value2",
 			expected: url.Values{
-				"key1": []string{"value1"},
-				"key2": []string{"value2"},
+				testParamKey1: []string{testParamValue1},
+				testParamKey2: []string{testParamValue2},
 			},
 		},
 	}
@@ -252,28 +252,28 @@ func TestExecMissingConfig(t *testing.T) {
 // TestExecMissingJenkinsUsername tests Exec with missing username
 func TestExecMissingJenkinsUsername(t *testing.T) {
 	plugin := Plugin{
-		BaseURL: "http://example.com",
+		BaseURL: testExampleURL,
 	}
 
 	err := plugin.Exec(context.Background())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "configuration error")
-	assert.Contains(t, err.Error(), "authentication required")
+	assert.Contains(t, err.Error(), testAuthRequiredErr)
 }
 
 // TestExecMissingJenkinsToken tests Exec with missing token
 func TestExecMissingJenkinsToken(t *testing.T) {
 	plugin := Plugin{
-		BaseURL:  "http://example.com",
-		Username: "foo",
+		BaseURL:  testExampleURL,
+		Username: testUserFoo,
 	}
 
 	err := plugin.Exec(context.Background())
 
 	assert.Error(t, err)
 	assert.Contains(t, err.Error(), "configuration error")
-	assert.Contains(t, err.Error(), "authentication required")
+	assert.Contains(t, err.Error(), testAuthRequiredErr)
 }
 
 // TestExecMissingJenkinsJob tests Exec with missing or empty job list
@@ -288,7 +288,7 @@ func TestExecMissingJenkinsJob(t *testing.T) {
 		},
 		{
 			name: "only whitespace jobs",
-			jobs: []string{"   ", "\t", "\n"},
+			jobs: []string{testWhitespaceVal, "\t", "\n"},
 		},
 		{
 			name: "nil jobs",
@@ -299,9 +299,9 @@ func TestExecMissingJenkinsJob(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			plugin := Plugin{
-				BaseURL:  "http://example.com",
-				Username: "foo",
-				Token:    "bar",
+				BaseURL:  testExampleURL,
+				Username: testUserFoo,
+				Token:    testUserBar,
 				Job:      tt.jobs,
 			}
 
@@ -326,8 +326,8 @@ func TestExecTriggerBuild(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:  server.URL,
-		Username: "foo",
-		Token:    "bar",
+		Username: testUserFoo,
+		Token:    testUserBar,
 		Job:      []string{"drone-jenkins"},
 	}
 
@@ -353,8 +353,8 @@ func TestExecTriggerMultipleJobs(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:  server.URL,
-		Username: "foo",
-		Token:    "bar",
+		Username: testUserFoo,
+		Token:    testUserBar,
 		Job:      []string{"job1", "job2", "job3"},
 	}
 
@@ -377,8 +377,8 @@ func TestExecWithParameters(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:    server.URL,
-		Username:   "foo",
-		Token:      "bar",
+		Username:   testUserFoo,
+		Token:      testUserBar,
 		Job:        []string{"parameterized-job"},
 		Parameters: "branch=main\nenvironment=production",
 	}
@@ -403,16 +403,16 @@ func TestExecWithRemoteToken(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:     server.URL,
-		Username:    "foo",
-		Token:       "bar",
-		RemoteToken: "remote-token-123",
+		Username:    testUserFoo,
+		Token:       testUserBar,
+		RemoteToken: testRemoteTokenValue,
 		Job:         []string{"secure-job"},
 	}
 
 	err := plugin.Exec(context.Background())
 
 	assert.NoError(t, err)
-	assert.Equal(t, "remote-token-123", receivedToken)
+	assert.Equal(t, testRemoteTokenValue, receivedToken)
 }
 
 // TestExecWithJobsContainingWhitespace tests job list with whitespace
@@ -432,9 +432,9 @@ func TestExecWithJobsContainingWhitespace(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:  server.URL,
-		Username: "foo",
-		Token:    "bar",
-		Job:      []string{"  job1  ", "job2", "   ", "job3"},
+		Username: testUserFoo,
+		Token:    testUserBar,
+		Job:      []string{"  job1  ", "job2", testWhitespaceVal, "job3"},
 	}
 
 	err := plugin.Exec(context.Background())
@@ -467,9 +467,9 @@ func TestExecWithWaitSuccess(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:  server.URL,
-		Username: "foo",
-		Token:    "bar",
-		Job:      []string{"test-job"},
+		Username: testUserFoo,
+		Token:    testUserBar,
+		Job:      []string{testJobName},
 		Wait:     true,
 	}
 
@@ -501,9 +501,9 @@ func TestExecWithWaitFailure(t *testing.T) {
 
 	plugin := Plugin{
 		BaseURL:  server.URL,
-		Username: "foo",
-		Token:    "bar",
-		Job:      []string{"test-job"},
+		Username: testUserFoo,
+		Token:    testUserBar,
+		Job:      []string{testJobName},
 		Wait:     true,
 	}
 

test_helpers_test.go

@@ -0,0 +1,18 @@
+package main
+
+const (
+	testUserFoo          = "foo"
+	testUserBar          = "bar"
+	testUserName         = "test"
+	testJobName          = "test-job"
+	testExampleURL       = "http://example.com"
+	testAuthRequiredErr  = "authentication required"
+	testRemoteTokenValue = "remote-token-123"
+	testWhitespaceVal    = "   "
+	testValidStr         = "valid"
+	testParamKey         = "key"
+	testParamKey1        = "key1"
+	testParamKey2        = "key2"
+	testParamValue1      = "value1"
+	testParamValue2      = "value2"
+)