add graphrow symbol tests

Author: philocalyst

src/components/utils/graphrow.rs

@@ -16,3 +16,40 @@ pub const SYM_TEE_RIGHT: &str = "┣";
 pub const SYM_TEE_UP: &str = "┻";
 pub const SYM_TEE_DOWN: &str = "┳";
 pub const SYM_SPACE: &str = " ";
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn symbols_are_single_char_and_distinct() {
+		let symbols = [
+			SYM_COMMIT,
+			SYM_COMMIT_BRANCH,
+			SYM_COMMIT_MERGE,
+			SYM_COMMIT_STASH,
+			SYM_COMMIT_UNCOMMITTED,
+			SYM_VERTICAL,
+			SYM_VERTICAL_DOTTED,
+			SYM_HORIZONTAL,
+			SYM_MERGE_BRIDGE_START,
+			SYM_MERGE_BRIDGE_MID,
+			SYM_MERGE_BRIDGE_END,
+			SYM_BRANCH_UP,
+			SYM_BRANCH_UP_RIGHT,
+			SYM_TEE_LEFT,
+			SYM_TEE_RIGHT,
+			SYM_TEE_UP,
+			SYM_TEE_DOWN,
+			SYM_SPACE,
+		];
+
+		for symbol in symbols {
+			assert_eq!(
+				symbol.chars().count(),
+				1,
+				"{symbol:?} should be a single glyph"
+			);
+		}
+	}
+}