diff --git a/src/jvmTest/kotlin/command/CommandBuilderTest.kt b/src/jvmTest/kotlin/command/CommandBuilderTest.kt
new file mode 100644
index 0000000..53a089d
--- /dev/null
+++ b/src/jvmTest/kotlin/command/CommandBuilderTest.kt
@@ -0,0 +1,116 @@
+package command
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import utils.SigningMode
+
+class CommandBuilderTest {
+
+    @Test
+    fun `validateAndGetCommand should return error if bundletoolPath is empty`() {
+        val result = CommandBuilder()
+            .validateAndGetCommand()
+        assertEquals("bundletoolPath", result.first)
+        assertEquals(false, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return error if aabFilePath is empty`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .validateAndGetCommand()
+        assertEquals("aabFilePath", result.first)
+        assertEquals(false, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return error if aapt2Path is empty but isAapt2PathEnabled is true`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path", "gg.gg"))
+            .isAapt2PathEnabled(true)
+            .validateAndGetCommand()
+        assertEquals("aapt2Path", result.first)
+        assertEquals(false, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return error if signingMode is RELEASE but keystore information is missing`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path/to/", "file.aab"))
+            .signingMode(SigningMode.RELEASE)
+            .validateAndGetCommand()
+        assertEquals("Check Keystore Info!", result.first)
+        assertEquals(false, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return valid command for RELEASE signing mode with all required parameters`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path/to/", "file.aab"))
+            .signingMode(SigningMode.RELEASE)
+            .keyStorePath("/path/to/keystore.jks")
+            .keyStorePassword("keystorePassword")
+            .keyAlias("keyAlias")
+            .keyPassword("keyPassword")
+            .isUniversalMode(false).validateAndGetCommand()
+        assertEquals(
+            "java -jar \"bundletool.jar\" build-apks --bundle=\"/path/to/file.aab\" --output=\"/path/to/file.apks\" --ks=/path/to/keystore.jks --ks-pass=pass:keystorePassword --ks-key-alias=keyAlias --key-pass=pass:keyPassword ",
+            result.first
+        )
+        assertEquals(true, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return valid command for DEBUG signing mode without keystore information`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path/to/", "file.aab"))
+            .signingMode(SigningMode.DEBUG)
+            .isUniversalMode(false)
+            .validateAndGetCommand()
+        assertEquals(
+            "java -jar \"bundletool.jar\" build-apks --bundle=\"/path/to/file.aab\" --output=\"/path/to/file.apks\" ",
+            result.first
+        )
+        assertEquals(true, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return valid command for verifying adb path`() {
+        val result = CommandBuilder()
+            .verifyAdbPath(true, "/path/to/adb")
+            .getAdbVerifyCommand()
+        assertEquals("\"/path/to/adb\" version", result)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return valid command for universal mode enabled`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path/to/", "file.aab"))
+            .isUniversalMode(true)
+            .validateAndGetCommand()
+        assertEquals(
+            "java -jar \"bundletool.jar\" build-apks --mode=universal --bundle=\"/path/to/file.aab\" --output=\"/path/to/file.apks\" ",
+            result.first
+        )
+        assertEquals(true, result.second)
+    }
+
+    @Test
+    fun `validateAndGetCommand should return valid command with overwrite enabled`() {
+        val result = CommandBuilder()
+            .bundletoolPath("bundletool.jar")
+            .aabFilePath(Pair("/path/to/", "file.aab"))
+            .isOverwrite(true)
+            .isUniversalMode(false).validateAndGetCommand()
+        assertEquals(
+            "java -jar \"bundletool.jar\" build-apks --overwrite --bundle=\"/path/to/file.aab\" --output=\"/path/to/file.apks\" ",
+            result.first
+        )
+        assertEquals(true, result.second)
+    }
+}