diff --git a/libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/NpmRangeTest.kt b/libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/NpmRangeTest.kt
index a5c87273772..c2fd42a329c 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/NpmRangeTest.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/NpmRangeTest.kt
@@ -12,6 +12,66 @@ import kotlin.test.assertTrue
 class NpmRangeTest {
     @Test
     fun maxStartWith() {
-        assertTrue { false }
+        val nullRange1 = npmRange()
+        val nullRange2 = npmRange()
+        val maxStart1 = maxStart(
+            nullRange1,
+            nullRange2
+        )
+        assertTrue("Max start should be ${nullRange2.startVersion} but $maxStart1 found") {
+            maxStart1 == nullRange2.startVersion
+        }
+
+        val startRange1 = npmRange(
+            startMajor = 1
+        )
+        val maxStart2 = maxStart(
+            startRange1,
+            npmRange()
+        )
+        assertTrue("Max start should be ${startRange1.startVersion} but $maxStart2 found") {
+            maxStart2 == startRange1.startVersion
+        }
+
+        val startRange2 = npmRange(startMajor = 2)
+        val maxStart3 = maxStart(
+            startRange1,
+            startRange2
+        )
+        assertTrue("Max start should be ${startRange2.startVersion} but $maxStart3 found") {
+            maxStart3 == startRange2.startVersion
+        }
     }
-}
\ No newline at end of file
+}
+
+private fun npmRange(
+    startMajor: Int? = null,
+    startMinor: Int? = null,
+    startPatch: Int? = null,
+    endMajor: Int? = null,
+    endMinor: Int? = null,
+    endPatch: Int? = null,
+    startInclusive: Boolean = false,
+    endInclusive: Boolean = false
+): NpmRange =
+    NpmRange(
+        startVersion = semVer(startMajor, startMinor, startPatch),
+        endVersion = semVer(endMajor, endMinor, endPatch),
+        startInclusive = startInclusive,
+        endInclusive = endInclusive
+    )
+
+private fun semVer(
+    major: Int? = null,
+    minor: Int? = null,
+    patch: Int? = null
+): SemVer? =
+    if (major == null && minor == null && patch == null)
+        null
+    else {
+        SemVer(
+            (major ?: 0).toBigInteger(),
+            (minor ?: 0).toBigInteger(),
+            (patch ?: 0).toBigInteger()
+        )
+    }
\ No newline at end of file