test(config): Verify bad merge

crates/typos-cli/tests/cmd/extend-builtin-dict.in/_typos.toml

@@ -0,0 +1,10 @@
+[type.rust]
+check-filename = false
+
+[default.extend-words]
+foo = "bar"
+
+[files]
+extend-exclude = [
+  "_typos.toml"
+]

crates/typos-cli/tests/cmd/extend-builtin-dict.in/foo.rs

@@ -0,0 +1 @@
+flate2

crates/typos-cli/tests/cmd/extend-builtin-dict.toml

@@ -0,0 +1,16 @@
+bin.name = "typos"
+args = ""
+status.code = 2
+stdin = '''
+\n\n
+Destory
+'''
+stdout = """
+error: `flate` should be `flat`
+  --> ./foo.rs:1:1
+  |
+1 | flate2
+  | ^^^^^
+  |
+"""
+stderr = ""