New ClassNameFormatter that handles formatting a valid class name (#851)

misk/src/main/kotlin/misk/web/formatter/ClassNameFormatter.kt

@@ -0,0 +1,13 @@
+package misk.web.formatter
+
+import javax.inject.Inject
+import kotlin.reflect.KClass
+
+class ClassNameFormatter @Inject constructor() {
+  fun <T : Any> format(kclass: KClass<T>): String {
+    return when (kclass.qualifiedName) {
+      null -> kclass.toString().split("class ").last()
+      else -> kclass.qualifiedName.toString()
+    }
+  }
+}

misk/src/test/kotlin/misk/web/formatter/ClassNameFormatterTest.kt

@@ -0,0 +1,53 @@
+package misk.web.formatter
+
+import com.google.common.base.CharMatcher
+import misk.testing.MiskTest
+import misk.web.NetworkChain
+import misk.web.NetworkInterceptor
+import misk.web.Response
+import org.junit.jupiter.api.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertNull
+import kotlin.test.assertTrue
+
+@MiskTest(startService = false)
+class ClassNameFormatterTest {
+  fun isValid(className: String) {
+    assertTrue(className.isNotBlank())
+    assertNotNull(className)
+    assertTrue(
+        CharMatcher.inRange('A', 'Z').or(CharMatcher.inRange('a', 'z')).matchesAnyOf(className))
+  }
+
+  @Test fun validQualifiedName() {
+    val formatted = ClassNameFormatter().format(ValidQualifiedNameClass::class)
+    isValid(formatted)
+    assertEquals(formatted, ValidQualifiedNameClass::class.qualifiedName.toString())
+  }
+
+  @Test fun missingQualifiedName() {
+    val noQualifiedNameClass = NoQualifiedNameFactory().create()
+    assertNull(noQualifiedNameClass::class.qualifiedName)
+
+    val formatted = ClassNameFormatter().format(noQualifiedNameClass::class)
+    isValid(formatted)
+    assertEquals(formatted, noQualifiedNameClass::class.toString().split("class ").last())
+  }
+}
+
+class ValidQualifiedNameClass {}
+
+class NoQualifiedNameFactory {
+  fun create(): NetworkInterceptor {
+    return NoQualifiedNameClass
+  }
+
+  private companion object {
+    val NoQualifiedNameClass = object : NetworkInterceptor {
+      override fun intercept(chain: NetworkChain): Response<*> {
+        return Response("False")
+      }
+    }
+  }
+}