Add tests for JsonReaderExtensions

api/src/test/java/com/readrops/api/utils/JsonReaderExtensionsTest.kt

@@ -0,0 +1,85 @@
+package com.readrops.api.utils
+
+import com.squareup.moshi.JsonReader
+import junit.framework.TestCase.assertEquals
+import junit.framework.TestCase.assertNull
+import okio.Buffer
+import org.junit.Test
+
+class JsonReaderExtensionsTest {
+
+    @Test
+    fun nextNullableStringNullCaseTest() {
+        val reader = JsonReader.of(Buffer().readFrom("""
+            {
+                "field": null
+            }
+        """.trimIndent().byteInputStream()))
+
+        reader.beginObject()
+        reader.nextName()
+
+        assertNull(reader.nextNullableString())
+        reader.endObject()
+    }
+
+    @Test
+    fun nextNullableStringEmptyCaseTest() {
+        val reader = JsonReader.of(Buffer().readFrom("""
+            {
+                "field": ""
+            }
+        """.trimIndent().byteInputStream()))
+
+        reader.beginObject()
+        reader.nextName()
+
+        assertNull(reader.nextNullableString())
+        reader.endObject()
+    }
+
+    @Test
+    fun nextNullableValueNormalCaseTest() {
+        val reader = JsonReader.of(Buffer().readFrom("""
+            {
+                "field": "value"
+            }
+        """.trimIndent().byteInputStream()))
+
+        reader.beginObject()
+        reader.nextName()
+
+        assertEquals(reader.nextNullableString(), "value")
+        reader.endObject()
+    }
+
+    @Test
+    fun nextNonEmptyStringTest() {
+        val reader = JsonReader.of(Buffer().readFrom("""
+            {
+                "field": "value"
+            }
+        """.trimIndent().byteInputStream()))
+
+        reader.beginObject()
+        reader.nextName()
+
+        assertEquals(reader.nextNullableString(), "value")
+        reader.endObject()
+    }
+
+    @Test(expected = ParseException::class)
+    fun nextNonEmptyStringEmptyCaseTest() {
+        val reader = JsonReader.of(Buffer().readFrom("""
+            {
+                "field": ""
+            }
+        """.trimIndent().byteInputStream()))
+
+        reader.beginObject()
+        reader.nextName()
+
+        reader.nextNonEmptyString()
+    }
+
+}