Return info about config subsection when trying to get an invalid enum

Change-Id: Id4a72a68bdbd485619f4801683d38ad98f9841a2

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ConfigTest.java

@@ -292,6 +292,25 @@ public class ConfigTest {
 		assertSame(TestEnum.ONE_TWO, c.getEnum("s", "b", "c", TestEnum.ONE_TWO));
 	}
 
+	@Test
+	public void testGetInvalidEnum() throws ConfigInvalidException {
+		Config c = parse("[a]\n\tb = invalid\n");
+		try {
+			c.getEnum("a", null, "b", TestEnum.ONE_TWO);
+			fail();
+		} catch (IllegalArgumentException e) {
+			assertEquals("Invalid value: a.b=invalid", e.getMessage());
+		}
+
+		c = parse("[a \"b\"]\n\tc = invalid\n");
+		try {
+			c.getEnum("a", "b", "c", TestEnum.ONE_TWO);
+			fail();
+		} catch (IllegalArgumentException e) {
+			assertEquals("Invalid value: a.b.c=invalid", e.getMessage());
+		}
+	}
+
 	@Test
 	public void testSetEnum() {
 		final Config c = new Config();

org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java

@@ -412,11 +412,13 @@ public class Config {
 		}
 
 		if (subsection != null)
-			throw new IllegalArgumentException(MessageFormat.format(JGitText
+			throw new IllegalArgumentException(MessageFormat.format(
-					.get().enumValueNotSupported3, section, name, value));
+					JGitText.get().enumValueNotSupported3, section, subsection,
+					name, value));
 		else
-			throw new IllegalArgumentException(MessageFormat.format(JGitText
+			throw new IllegalArgumentException(
-					.get().enumValueNotSupported2, section, name, value));
+					MessageFormat.format(JGitText.get().enumValueNotSupported2,
+							section, name, value));
 	}
 
 	/**