Add test for missing @partial-block ref #634

Author: jknack

handlebars/src/main/java/com/github/jknack/handlebars/Handlebars.java

@@ -1254,7 +1254,8 @@ public Handlebars parentScopeResolution(final boolean parentScopeResolution) {
    * <pre>
    *     {{> @partial-block}}
    * </pre>
-   * Attention: If this is set to true, Handlebars works *much* slower!
+   * Attention: If this is set to true, Handlebars works *much* slower! while rendering
+   * partial blocks. Default is: true for compatibility reasons.
    *
    * @return If true partial blocks will be evaluated before the partial will be rendered
    *         to allow inline block side effects.
@@ -1271,7 +1272,8 @@ public boolean preEvaluatePartialBlocks() {
    * <pre>
    *     {{> @partial-block}}
    * </pre>
-   * Attention: If this is set to true, Handlebars works *much* slower!
+   * Attention: If this is set to true, Handlebars works *much* slower! while rendering
+   * partial blocks. Default is: true for compatibility reasons.
    *
    * @param preEvaluatePartialBlocks If true partial blocks will be evaluated before the
    *                                 partial will be rendered to allow inline block side
@@ -1290,7 +1292,8 @@ public void setPreEvaluatePartialBlocks(final boolean preEvaluatePartialBlocks)
    * <pre>
    *     {{> @partial-block}}
    * </pre>
-   * Attention: If this is set to true, Handlebars works *much* slower!
+   * Attention: If this is set to true, Handlebars works *much* slower! while rendering
+   * partial blocks. Default is: true for compatibility reasons.
    *
    * @param preEvaluatePartialBlocks If true partial blocks will be evaluated before the
    *                                 partial will be rendered to allow inline block side

handlebars/src/test/java/com/github/jknack/handlebars/issues/Issue634.java

@@ -0,0 +1,28 @@
+package com.github.jknack.handlebars.issues;
+
+import com.github.jknack.handlebars.HandlebarsException;
+import com.github.jknack.handlebars.v4Test;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import org.junit.Test;
+
+public class Issue634 extends v4Test {
+
+  @Test
+  public void shouldThrowHandlebarsExceptionWhenPartialBlockIsMissing() throws Exception {
+    try {
+      shouldCompileTo("{{> my-partial}}",
+          $("partials", $("my-partial", "Hello {{> @partial-block}}")), null);
+      fail("Must throw HandlebarsException");
+    } catch (HandlebarsException x) {
+      assertTrue(x.getMessage().contains("does not provide a @partial-block"));
+    }
+  }
+
+  @Test
+  public void shouldNotThrowHandlebarsException() throws Exception {
+    shouldCompileTo("{{#> my-partial}}634{{/my-partial}}",
+        $("partials", $("my-partial", "Hello {{> @partial-block}}")), "Hello 634");
+  }
+
+}