Use kotlin.test.Test instead of org.junit.Test in common stdlib tests

(and in jvm-only and js-only tests also)

libraries/stdlib/test/numbers/BigNumbersTest.kt

@@ -5,7 +5,6 @@ import java.math.BigInteger
 import java.math.BigDecimal
 
 import kotlin.test.*
-import org.junit.Test
 import java.math.MathContext
 import java.math.RoundingMode
 

libraries/stdlib/test/numbers/BitwiseOperationsTest.kt

@@ -1,7 +1,6 @@
 package test.numbers
 
 import kotlin.test.*
-import org.junit.Test
 
 // TODO: Run these tests during compiler test only (JVM & JS)
 class BitwiseOperationsTest {

libraries/stdlib/test/numbers/CompanionIntrinsicObjectsJVMTest.kt

@@ -19,7 +19,6 @@ package test.numbers
 
 import kotlin.test.*
 
-import org.junit.Test
 
 class CompanionIntrinsicObjectsJVMTest {
     @Test fun intTest() {

libraries/stdlib/test/numbers/MathJVMTest.kt

@@ -2,7 +2,6 @@
 package test.numbers
 
 import kotlin.test.*
-import org.junit.Test
 import kotlin.math.*
 
 class MathJVMTest {

libraries/stdlib/test/numbers/MathTest.kt

@@ -16,7 +16,6 @@
 
 package test.numbers
 
-import org.junit.Test
 import kotlin.math.*
 import kotlin.test.*
 

libraries/stdlib/test/numbers/NaNPropagationTest.kt

@@ -1,9 +1,7 @@
 package numbers
 
-import org.junit.Test
-import kotlin.test.assertTrue
+import kotlin.test.*
 import kotlin.comparisons.*
-import kotlin.test.assertEquals
 
 val Double.Companion.values get() = listOf(0.0, NEGATIVE_INFINITY, MIN_VALUE, MAX_VALUE, POSITIVE_INFINITY, NaN)
 val Float.Companion.values get() = listOf(0.0f, NEGATIVE_INFINITY, MIN_VALUE, MAX_VALUE, POSITIVE_INFINITY, NaN)

libraries/stdlib/test/numbers/NumbersJVMTest.kt

@@ -2,7 +2,6 @@
 package test.numbers
 
 import java.math.BigDecimal
-import org.junit.Test
 import kotlin.test.*
 
 class NumbersJVMTest {

libraries/stdlib/test/numbers/NumbersTest.kt

@@ -1,6 +1,5 @@
 package test.numbers
 
-import org.junit.Test
 import kotlin.test.*
 
 object NumbersTestConstants {