diff --git a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationFunctionalTest.groovy b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationFunctionalTest.groovy
index ec8b25587..028195c77 100644
--- a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationFunctionalTest.groovy
+++ b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationFunctionalTest.groovy
@@ -51,7 +51,7 @@ import java.nio.file.Files
 
 class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
     def "can build a native image for a simple application"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
         debug = true
 
         given:
@@ -85,7 +85,7 @@ class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
 
     @Issue("https://github.com/graalvm/native-build-tools/issues/129")
     def "can build a native image with dependencies only needed by native image"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
 
         given:
         withSample("java-application-with-extra-sourceset")
@@ -119,7 +119,7 @@ class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
     })
     @Ignore("Need to find another way to test this since toolchains will now always be evaluated early")
     def "can override toolchain selection"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
 
         given:
         withSample("java-application")
@@ -178,7 +178,7 @@ class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
         }
 
         and:
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
         nativeApp.exists()
 
         when:
@@ -191,7 +191,7 @@ class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
 
     @Issue("https://github.com/graalvm/native-build-tools/issues/275")
     def "can pass environment variables to the builder process"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
 
         given:
         withSample("java-application")
@@ -221,7 +221,7 @@ class JavaApplicationFunctionalTest extends AbstractFunctionalTest {
     @IgnoreIf({ System.getenv("IS_GRAALVM_DEV_BUILD") })
     def "can build a native image with PGO instrumentation"() {
         def pgoDir = file("src/pgo-profiles/main").toPath()
-        def nativeApp = file("build/native/nativeCompile/java-application-instrumented")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application-instrumented")
         def pgoFile = file("build/native/nativeCompile/default.iprof")
 
         given:
diff --git a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithResourcesFunctionalTest.groovy b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithResourcesFunctionalTest.groovy
index e6e38ed5c..8f84ba351 100644
--- a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithResourcesFunctionalTest.groovy
+++ b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithResourcesFunctionalTest.groovy
@@ -46,7 +46,7 @@ import spock.lang.Unroll
 class JavaApplicationWithResourcesFunctionalTest extends AbstractFunctionalTest {
     @Unroll("can build an application which uses resources using #pattern with JUnit Platform #junitVersion")
     def "can build an application which uses resources"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
         debug = true
         given:
         withSample("java-application-with-resources")
@@ -196,7 +196,7 @@ graalvmNative {
     }
 
     def "scans resources of jar file even if it includes a native-image/resources-config.json file"() {
-        def nativeApp = file("build/native/nativeCompile/java-application")
+        def nativeApp = getExecutableFile("build/native/nativeCompile/java-application")
         debug = true
         given:
         withSample("java-application-with-resources")
diff --git a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithTestsFunctionalTest.groovy b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithTestsFunctionalTest.groovy
index 80a08b7e4..d3f4f3765 100644
--- a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithTestsFunctionalTest.groovy
+++ b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaApplicationWithTestsFunctionalTest.groovy
@@ -49,7 +49,7 @@ import spock.lang.Unroll
 class JavaApplicationWithTestsFunctionalTest extends AbstractFunctionalTest {
     @Unroll("can execute tests in a native image with JUnit Platform #junitVersion")
     def "can build a native image and run it"() {
-        def nativeTestsApp = file("build/native/nativeTestCompile/java-application-tests")
+        def nativeTestsApp = getExecutableFile("build/native/nativeTestCompile/java-application-tests")
 
         given:
         withSample("java-application-with-tests")
diff --git a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaLibraryFunctionalTest.groovy b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaLibraryFunctionalTest.groovy
index fcc0d98e3..a4ed3a99a 100644
--- a/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaLibraryFunctionalTest.groovy
+++ b/native-gradle-plugin/src/functionalTest/groovy/org/graalvm/buildtools/gradle/JavaLibraryFunctionalTest.groovy
@@ -46,16 +46,7 @@ import org.graalvm.buildtools.gradle.fixtures.AbstractFunctionalTest
 class JavaLibraryFunctionalTest extends AbstractFunctionalTest {
 
     def "can build a native image for a simple library"() {
-        def libExt = ""
-        if (IS_LINUX) {
-            libExt = ".so"
-        } else if (IS_WINDOWS) {
-            libExt = ".dll"
-        } else if (IS_MAC) {
-            libExt = ".dylib"
-        }
-
-        def library = file("build/native/nativeCompile/java-library" + libExt)
+        def sharedLibrary = getSharedLibraryFile("build/native/nativeCompile/java-library")
         debug  = true
 
         given:
@@ -73,6 +64,6 @@ class JavaLibraryFunctionalTest extends AbstractFunctionalTest {
         outputContains "--shared"
 
         and:
-        library.exists()
+        sharedLibrary.exists()
     }
 }
diff --git a/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy b/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
index aed808f5e..aeb10aa5b 100644
--- a/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
+++ b/native-gradle-plugin/src/testFixtures/groovy/org/graalvm/buildtools/gradle/fixtures/AbstractFunctionalTest.groovy
@@ -91,6 +91,23 @@ abstract class AbstractFunctionalTest extends Specification {
         path(pathElements).toFile()
     }
 
+    File getExecutableFile(String path) {
+        file(IS_WINDOWS ? path + ".exe" : path)
+    }
+
+    File getSharedLibraryFile(String path) {
+        def libExt = ""
+        if (IS_LINUX) {
+            libExt = ".so"
+        } else if (IS_WINDOWS) {
+            libExt = ".dll"
+        } else if (IS_MAC) {
+            libExt = ".dylib"
+        }
+        assert !libExt.isEmpty(): "Unable to determine shared library extension: unexpected operating system"
+        file("build/native/nativeCompile/java-library" + libExt)
+    }
+
     File getGroovyBuildFile() {
         file("build.gradle")
     }