Generate nicer errors for failures to parse main namespace name

2 files changed, 33 insertions, 2 deletions

diff --git a/src/test/java/org/shedlang/compiler/config/BinConfigTests.java b/src/test/java/org/shedlang/compiler/config/BinConfigTests.java
index 925088fe..aead8546 100644
--- a/src/test/java/org/shedlang/compiler/config/BinConfigTests.java
+++ b/src/test/java/org/shedlang/compiler/config/BinConfigTests.java
@@ -1,10 +1,12 @@
 package org.shedlang.compiler.config;
 
 import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.config.errors.ConfigError;
 import org.shedlang.compiler.config.toml.TomlTableWithSource;
 import org.shedlang.compiler.sources.Sources;
 import org.shedlang.compiler.types.NamespaceName;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.zwobble.precisely.AssertThat.assertThat;
 import static org.zwobble.precisely.Matchers.*;
 
@@ -23,4 +25,29 @@ public class BinConfigTests {
             has("mainNamespace", x -> x.mainNamespace(), equalTo(NamespaceName.of("A", "B")))
         ));
     }
+    @Test
+    public void whenMainNamespaceHasSyntaxErrorThenErrorIsThrown() {
+        var source = Sources.string("""
+            name = "one"
+            main-namespace = "A.B"
+            """);
+
+        var error = assertThrows(
+            ConfigError.class,
+            () -> BinConfig.fromToml(TomlTableWithSource.parse(source))
+        );
+
+        assertThat(error.getMessage(), equalTo("""
+            Invalid namespace name.
+            Expected: END
+            But got: SYMBOL_DOT "."
+            
+            <string>:1:2
+            A.B
+             ^"""));
+        assertThat(error.source().describe(), equalTo("""
+            <string>:2:1
+            main-namespace = "A.B"
+            ^"""));
+    }
 }
diff --git a/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java b/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
index 41bb3c0f..1086671c 100644
--- a/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
+++ b/src/test/java/org/shedlang/compiler/config/toml/TomlTableWithSourceTests.java
@@ -243,7 +243,9 @@ public class TomlTableWithSourceTests {
             .get(1)
             .getString("name");
 
-        assertThat(result, equalTo("two"));
+        assertThat(result, equalTo(
+            new TomlString("two", source.at(42, 42))
+        ));
     }
 
     @Test
@@ -316,6 +318,8 @@ public class TomlTableWithSourceTests {
             .get(1)
             .getStringOrNone("name");
 
-        assertThat(result, equalTo(Optional.of("two")));
+        assertThat(result, equalTo(Optional.of(
+            new TomlString("two", source.at(42, 42))
+        )));
     }
 }