adding new sanity check

Author: Francisco Cavedon

support/src/main/java/com/shopify/graphql/support/Query.java

@@ -5,6 +5,7 @@
  */
 public abstract class Query<T extends Query> {
     public static final String ALIAS_SUFFIX_SEPARATOR = "__";
+    private static final String BAD_ALIAS_SEPARATOR = "-";
     private static final String ALIAS_DELIMITER = ":";
     protected final StringBuilder _queryBuilder;
     private boolean firstSelection = true;
@@ -82,6 +83,9 @@ public T withAlias(String aliasSuffix) {
         if (aliasSuffix.contains(Query.ALIAS_SUFFIX_SEPARATOR)) {
             throw new IllegalArgumentException("Alias must not contain __");
         }
+        if (aliasSuffix.contains(Query.BAD_ALIAS_SEPARATOR)) {
+            throw new IllegalArgumentException("Alias must not contain -");
+        }
         this.aliasSuffix = aliasSuffix;
         // noinspection unchecked
         return (T) this;

support/src/test/java/com/shopify/graphql/support/QueryTest.java

@@ -3,7 +3,6 @@
 import org.junit.Test;
 
 import static junit.framework.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
 
 public class QueryTest {
     @Test
@@ -13,29 +12,18 @@ public void testStringEscaping() throws Exception {
         assertEquals("\"\\u0000 \\r \\n \\\\ \\\" c ꝏ\"", result.toString());
     }
 
-    @Test
-    public void testInvalidAlias() {
-        boolean exceptionThrown = false;
-        try {
-            new Query<Query>(null) {
-            }.withAlias("invalid__alias");
-        } catch (IllegalArgumentException e) {
-            exceptionThrown = true;
-        } finally {
-            assertTrue(exceptionThrown);
-        }
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidAliasWithUnderscore() {
+        new Query<Query>(null) {}.withAlias("invalid__alias");
     }
 
-    @Test
+    @Test(expected = IllegalArgumentException.class)
+    public void testInvalidAliasWithDashes() {
+        new Query<Query>(null) {}.withAlias("invalid-alias");
+    }
+
+    @Test(expected = IllegalArgumentException.class)
     public void testBlankAlias() {
-        boolean exceptionThrown = false;
-        try {
-            new Query<Query>(null) {
-            }.withAlias("");
-        } catch (IllegalArgumentException e) {
-            exceptionThrown = true;
-        } finally {
-            assertTrue(exceptionThrown);
-        }
+        new Query<Query>(null) {}.withAlias("");
     }
 }