diff --git a/packages/gradle-plugin/gradle/libs.versions.toml b/packages/gradle-plugin/gradle/libs.versions.toml
index 584509981d29cd..4544a5df14e910 100644
--- a/packages/gradle-plugin/gradle/libs.versions.toml
+++ b/packages/gradle-plugin/gradle/libs.versions.toml
@@ -5,6 +5,7 @@ guava = "31.0.1-jre"
 javapoet = "1.13.0"
 junit = "4.13.2"
 kotlin = "1.9.24"
+assertj = "3.25.1"
 
 [libraries]
 kotlin-gradle-plugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
@@ -13,6 +14,7 @@ gson = { module = "com.google.code.gson:gson", version.ref = "gson" }
 guava = { module = "com.google.guava:guava", version.ref = "guava" }
 javapoet = { module = "com.squareup:javapoet", version.ref = "javapoet" }
 junit = {module = "junit:junit", version.ref = "junit" }
+assertj = { module = "org.assertj:assertj-core", version.ref = "assertj" }
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts b/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
index 28055c6209252a..8506b017d289ef 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
+++ b/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
@@ -48,6 +48,7 @@ dependencies {
   implementation(libs.javapoet)
 
   testImplementation(libs.junit)
+  testImplementation(libs.assertj)
   testImplementation(project(":shared-testutil"))
 }
 
diff --git a/packages/gradle-plugin/settings-plugin/build.gradle.kts b/packages/gradle-plugin/settings-plugin/build.gradle.kts
index 39b65d466cffd8..58a7d069f30089 100644
--- a/packages/gradle-plugin/settings-plugin/build.gradle.kts
+++ b/packages/gradle-plugin/settings-plugin/build.gradle.kts
@@ -38,6 +38,7 @@ dependencies {
   implementation(libs.javapoet)
 
   testImplementation(libs.junit)
+  testImplementation(libs.assertj)
   testImplementation(project(":shared-testutil"))
 }
 
diff --git a/packages/gradle-plugin/settings-plugin/src/test/kotlin/com/facebook/react/ReactSettingsExtensionTest.kt b/packages/gradle-plugin/settings-plugin/src/test/kotlin/com/facebook/react/ReactSettingsExtensionTest.kt
index 3f89e1b935cf92..e203bff1e813d6 100644
--- a/packages/gradle-plugin/settings-plugin/src/test/kotlin/com/facebook/react/ReactSettingsExtensionTest.kt
+++ b/packages/gradle-plugin/settings-plugin/src/test/kotlin/com/facebook/react/ReactSettingsExtensionTest.kt
@@ -10,12 +10,10 @@ package com.facebook.react
 import com.facebook.react.ReactSettingsExtension.Companion.checkAndUpdateLockfiles
 import com.facebook.react.ReactSettingsExtension.Companion.computeSha256
 import com.facebook.react.ReactSettingsExtension.Companion.getLibrariesToAutolink
-import groovy.test.GroovyTestCase.assertEquals
 import java.io.File
+import org.assertj.core.api.Assertions.assertThat
 import org.gradle.testfixtures.ProjectBuilder
 import org.intellij.lang.annotations.Language
-import org.junit.Assert.assertFalse
-import org.junit.Assert.assertTrue
 import org.junit.Rule
 import org.junit.Test
 import org.junit.rules.TemporaryFolder
@@ -34,10 +32,8 @@ class ReactSettingsExtensionTest {
       }
       """
                 .trimIndent())
-
-    assertEquals(
-        "838aa9a72a16fdd55b0d49b510a82e264a30f59333b5fdd97c7798a29146f6a8",
-        computeSha256(validFile))
+    assertThat(computeSha256(validFile))
+        .isEqualTo("838aa9a72a16fdd55b0d49b510a82e264a30f59333b5fdd97c7798a29146f6a8")
   }
 
   @Test
@@ -52,7 +48,7 @@ class ReactSettingsExtensionTest {
                 .trimIndent())
 
     val map = getLibrariesToAutolink(validJsonFile)
-    assertEquals(0, map.keys.size)
+    assertThat(map.keys).isEmpty()
   }
 
   @Test
@@ -97,11 +93,9 @@ class ReactSettingsExtensionTest {
                 .trimIndent())
 
     val map = getLibrariesToAutolink(validJsonFile)
-    assertEquals(1, map.keys.size)
-    assertTrue(":react-native_oss-library-example" in map.keys)
-    assertEquals(
-        File("./node_modules/@react-native/oss-library-example/android"),
-        map[":react-native_oss-library-example"])
+    assertThat(map.keys).containsExactly(":react-native_oss-library-example")
+    assertThat(map[":react-native_oss-library-example"])
+        .isEqualTo(File("./node_modules/@react-native/oss-library-example/android"))
   }
 
   @Test
@@ -130,14 +124,14 @@ class ReactSettingsExtensionTest {
                 .trimIndent())
 
     val map = getLibrariesToAutolink(validJsonFile)
-    assertEquals(0, map.keys.size)
+    assertThat(map.keys).isEmpty()
   }
 
   @Test
   fun checkAndUpdateLockfiles_withNothingToCheck_returnsFalse() {
     val project = ProjectBuilder.builder().build()
     val noFiles = project.files()
-    assertFalse(checkAndUpdateLockfiles(noFiles, tempFolder.root))
+    assertThat(checkAndUpdateLockfiles(noFiles, tempFolder.root)).isFalse()
   }
 
   @Test
@@ -147,11 +141,10 @@ class ReactSettingsExtensionTest {
     tempFolder.newFile("yarn.lock").apply { writeText("I'm a lockfile") }
     val lockfileCollection = project.files("yarn.lock")
 
-    assertTrue(checkAndUpdateLockfiles(lockfileCollection, buildFolder))
-    assertTrue(File(buildFolder, "yarn.lock.sha").exists())
-    assertEquals(
-        "76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8",
-        File(buildFolder, "yarn.lock.sha").readText())
+    assertThat(checkAndUpdateLockfiles(lockfileCollection, buildFolder)).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").readText())
+        .isEqualTo("76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8")
   }
 
   @Test
@@ -164,11 +157,10 @@ class ReactSettingsExtensionTest {
     tempFolder.newFile("yarn.lock").apply { writeText("I'm a lockfile") }
     val lockfileCollection = project.files("yarn.lock")
 
-    assertTrue(checkAndUpdateLockfiles(lockfileCollection, buildFolder))
-    assertTrue(File(buildFolder, "yarn.lock.sha").exists())
-    assertEquals(
-        "76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8",
-        File(buildFolder, "yarn.lock.sha").readText())
+    assertThat(checkAndUpdateLockfiles(lockfileCollection, buildFolder)).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").readText())
+        .isEqualTo("76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8")
   }
 
   @Test
@@ -182,11 +174,10 @@ class ReactSettingsExtensionTest {
     tempFolder.newFile("yarn.lock").apply { writeText("I'm a lockfile") }
     val lockfileCollection = project.files("yarn.lock")
 
-    assertFalse(checkAndUpdateLockfiles(lockfileCollection, buildFolder))
-    assertTrue(File(buildFolder, "yarn.lock.sha").exists())
-    assertEquals(
-        "76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8",
-        File(buildFolder, "yarn.lock.sha").readText())
+    assertThat(checkAndUpdateLockfiles(lockfileCollection, buildFolder)).isFalse()
+    assertThat(File(buildFolder, "yarn.lock.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").readText())
+        .isEqualTo("76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8")
   }
 
   @Test
@@ -200,15 +191,13 @@ class ReactSettingsExtensionTest {
     tempFolder.newFile("package-lock.json").apply { writeText("and I'm another lockfile") }
     val lockfileCollection = project.files("yarn.lock", "package-lock.json")
 
-    assertTrue(checkAndUpdateLockfiles(lockfileCollection, buildFolder))
-    assertTrue(File(buildFolder, "yarn.lock.sha").exists())
-    assertTrue(File(buildFolder, "package-lock.json.sha").exists())
-    assertEquals(
-        "76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8",
-        File(buildFolder, "yarn.lock.sha").readText())
-    assertEquals(
-        "9be5bca432b81becf4f54451aea021add68376330581eaa93ab9a0b3e4e29a3b",
-        File(buildFolder, "package-lock.json.sha").readText())
+    assertThat(checkAndUpdateLockfiles(lockfileCollection, buildFolder)).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "package-lock.json.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").readText())
+        .isEqualTo("76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8")
+    assertThat(File(buildFolder, "package-lock.json.sha").readText())
+        .isEqualTo("9be5bca432b81becf4f54451aea021add68376330581eaa93ab9a0b3e4e29a3b")
   }
 
   @Test
@@ -225,15 +214,13 @@ class ReactSettingsExtensionTest {
     tempFolder.newFile("package-lock.json").apply { writeText("and I'm another lockfile") }
     val lockfileCollection = project.files("yarn.lock", "package-lock.json")
 
-    assertFalse(checkAndUpdateLockfiles(lockfileCollection, buildFolder))
-    assertTrue(File(buildFolder, "yarn.lock.sha").exists())
-    assertTrue(File(buildFolder, "package-lock.json.sha").exists())
-    assertEquals(
-        "76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8",
-        File(buildFolder, "yarn.lock.sha").readText())
-    assertEquals(
-        "9be5bca432b81becf4f54451aea021add68376330581eaa93ab9a0b3e4e29a3b",
-        File(buildFolder, "package-lock.json.sha").readText())
+    assertThat(checkAndUpdateLockfiles(lockfileCollection, buildFolder)).isFalse()
+    assertThat(File(buildFolder, "yarn.lock.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "package-lock.json.sha").exists()).isTrue()
+    assertThat(File(buildFolder, "yarn.lock.sha").readText())
+        .isEqualTo("76046b72442ee7eb130627e56c3db7c9907eef4913b17ad130335edc0eb702a8")
+    assertThat(File(buildFolder, "package-lock.json.sha").readText())
+        .isEqualTo("9be5bca432b81becf4f54451aea021add68376330581eaa93ab9a0b3e4e29a3b")
   }
 
   private fun createJsonFile(@Language("JSON") input: String) =
diff --git a/packages/gradle-plugin/shared/build.gradle.kts b/packages/gradle-plugin/shared/build.gradle.kts
index fa76599233ef37..f0758ad0be5de3 100644
--- a/packages/gradle-plugin/shared/build.gradle.kts
+++ b/packages/gradle-plugin/shared/build.gradle.kts
@@ -18,6 +18,7 @@ dependencies {
   implementation(libs.gson)
   implementation(libs.guava)
   testImplementation(libs.junit)
+  testImplementation(libs.assertj)
   testImplementation(project(":shared-testutil"))
 }