test: set case name from initial filename for a sequence

Port more incremental tests.

test/incremental/assert_function.0.zig

@@ -0,0 +1,15 @@
+pub fn main() void {
+    add(3, 4);
+}
+
+fn add(a: u32, b: u32) void {
+    assert(a + b == 7);
+}
+
+pub fn assert(ok: bool) void {
+    if (!ok) unreachable; // assertion failure
+}
+
+// run
+// target=x86_64-linux,x86_64-macos
+//