Move GraphQLQueryHelper and StreamHelper from the Core module

Drop-In/src/androidTest/java/com/braintreepayments/api/GraphQLQueryHelperTest.kt

@@ -0,0 +1,17 @@
+package com.braintreepayments.api
+
+import android.content.res.Resources.NotFoundException
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner
+import com.braintreepayments.api.GraphQLQueryHelper.getQuery
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4ClassRunner::class)
+class GraphQLQueryHelperTest {
+
+    @Test(expected = NotFoundException::class)
+    fun query_throwsResourcesNotFoundExceptionForInvalidResources() {
+        getQuery(ApplicationProvider.getApplicationContext(), -1)
+    }
+}

Drop-In/src/main/java/com/braintreepayments/api/GraphQLQueryHelper.kt

@@ -0,0 +1,20 @@
+package com.braintreepayments.api
+
+import android.content.Context
+import android.content.res.Resources
+import java.io.IOException
+import java.io.InputStream
+
+internal object GraphQLQueryHelper {
+    @JvmStatic
+    @Throws(Resources.NotFoundException::class, IOException::class)
+    fun getQuery(context: Context, queryResource: Int): String {
+        var inputStream: InputStream? = null
+        return try {
+            inputStream = context.resources.openRawResource(queryResource)
+            StreamHelper.getString(inputStream)
+        } finally {
+            inputStream?.close()
+        }
+    }
+}

Drop-In/src/main/java/com/braintreepayments/api/StreamHelper.kt

@@ -0,0 +1,23 @@
+package com.braintreepayments.api
+
+import java.io.BufferedReader
+import java.io.IOException
+import java.io.InputStream
+import java.io.InputStreamReader
+import java.lang.StringBuilder
+import java.nio.charset.Charset
+
+internal object StreamHelper {
+    @Throws(IOException::class)
+    fun getString(inputStream: InputStream?): String {
+        val buffReader = BufferedReader(InputStreamReader(inputStream, Charset.forName("UTF-8")))
+        return buffReader.use { reader ->
+            val data = StringBuilder()
+            var line: String?
+            while (reader.readLine().also { line = it } != null) {
+                data.append(line)
+            }
+            data.toString()
+        }
+    }
+}

Drop-In/src/test/java/com/braintreepayments/api/StreamHelperUnitTest.kt

@@ -0,0 +1,18 @@
+package com.braintreepayments.api
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import java.io.ByteArrayInputStream
+import java.nio.charset.StandardCharsets
+
+@RunWith(RobolectricTestRunner::class)
+class StreamHelperUnitTest {
+
+    @Test
+    fun getString_readsAStringFromAStream() {
+        val inputStream = ByteArrayInputStream("Test string".toByteArray(StandardCharsets.UTF_8));
+        assertEquals("Test string", StreamHelper.getString(inputStream))
+    }
+}