test: e2e test builds go-licenses in temp dir

e2e_test.go

@@ -42,12 +42,19 @@ func TestCsvCommandE2E(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	// This builds and installs go-licenses CLI to $(go env GOPATH)/bin.
-	cmd := exec.Command("go", "install", ".")
+	// This builds go-licenses CLI to temporary dir.
+	tempDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tempDir)
+	goLicensesPath := filepath.Join(tempDir, "go-licenses")
+	cmd := exec.Command("go", "build", "-o", goLicensesPath)
 	_, err = cmd.Output()
 	if err != nil {
 		t.Fatal(err)
 	}
+	t.Logf("Built go-licenses binary in %s.", goLicensesPath)
 	for _, tc := range tests {
 		t.Run(tc.workdir, func(t *testing.T) {
 			err := os.Chdir(filepath.Join(originalWorkDir, tc.workdir))
@@ -59,7 +66,7 @@ func TestCsvCommandE2E(t *testing.T) {
 			if err != nil {
 				t.Fatalf("downloading go modules:\n%s", string(log))
 			}
-			cmd = exec.Command("go-licenses", "csv", ".")
+			cmd = exec.Command(goLicensesPath, "csv", ".")
 			// Capture stderr to buffer.
 			var stderr bytes.Buffer
 			cmd.Stderr = &stderr