diff --git a/source/compilation/compilation.test.hon b/source/compilation/compilation.test.hon
index 4df7191..9ce25a9 100644
--- a/source/compilation/compilation.test.hon
+++ b/source/compilation/compilation.test.hon
@@ -70,10 +70,20 @@ keeps_package_declarations_distinct_and_ir_independent test {
 
 dependency_traps_keep_original_spans_and_remain_demand_driven test {
     mains [2][]u8 :: [
-        "dep :: import \"../dependency\"\nmain proc() int { return dep.fail(false) }\n",
-        "dep :: import \"../dependency\"\nmain proc() int { return dep.fail(true) }\n",
+        `dep :: import "../dependency"
+        `main proc() int { return dep.fail(false) }
+        `
+        ,
+        `dep :: import "../dependency"
+        `main proc() int { return dep.fail(true) }
+        `
+        ,
     ]
-    prefix :: "\nfail proc(take bool) int {\n    if take {\n        return "
+    prefix ::
+        `
+        `fail proc(take bool) int {
+        `    if take {
+        `
     for (mains) |main, index| {
         diagnostic_store := diagnostics.init(mem.c_allocator)
         defer diagnostics.deinit(&diagnostic_store)
@@ -88,7 +98,15 @@ dependency_traps_keep_original_spans_and_remain_demand_driven test {
             root_bytes := try owned_text(main)
             defer arraylist.deinit(&root_bytes)
             dependency_bytes := try owned_text(
-                "\nfail proc(take bool) int {\n    if take {\n        return missing\n    }\n    return 42\n}\n",
+                `
+                `fail proc(take bool) int {
+                `    if take {
+                `        return missing
+                `    }
+                `    return 42
+                `}
+                `
+                ,
             )
             defer arraylist.deinit(&dependency_bytes)
             root_source :: try add_source(&session, root, "app/main.hon", &root_bytes, &diagnostic_store)
@@ -105,8 +123,9 @@ dependency_traps_keep_original_spans_and_remain_demand_driven test {
         diagnostic :: diagnostics.get(&diagnostic_store, original)?
         try testing.expect_equal(diagnostics.Code.unknown_name, diagnostic.code)
         try testing.expect_equal(dependency_source, diagnostic.span.source)
-        try testing.expect_equal(u32(prefix.len), diagnostic.span.start)
-        try testing.expect_equal(u32(prefix.len + 7), diagnostic.span.end)
+        start :: u32(prefix.len + "        return ".len)
+        try testing.expect_equal(start, diagnostic.span.start)
+        try testing.expect_equal(start + 7, diagnostic.span.end)
         outcome := try interpreter.run(mem.c_allocator, &module, &diagnostic_store)
         defer interpreter.deinit(&outcome)
         try testing.expect_equal(1, diagnostics.count(&diagnostic_store))
diff --git a/tests/native.py b/tests/native.py
index 0956569..9eed34b 100644
--- a/tests/native.py
+++ b/tests/native.py
@@ -440,29 +440,72 @@ def check_dependency_provenance(temporary, executable):
     # A transitive call must report the leaf's location, not either importing file.
     bridge = project / "bridge"
     bridge.mkdir()
-    (bridge / "main.hon").write_text(
-        'import "../dependency"\nfail proc() int { return dependency.fail() }\n'
-    )
+    (bridge / "main.hon").write_text(textwrap.dedent("""
+        import "../dependency"
+        fail proc() int { return dependency.fail() }
+    """).strip() + "\n")
     cases = [
-        ("fail proc() int {\n    return `\n}\n", 4, 12, True),
-        ("fail proc() int {\n    return (1\n}\n", 4, 14, True),
-        ("fail proc() int {\n    text :: \"é\" return missing\n}\n", 4, 25, True),
-        ("fail proc() int {\n    if (1) return 0\n    return 42\n}\n", 4, 9, True),
-        ("fail proc() int {\n    return 9223372036854775808\n}\n", 4, 12, True),
-        ("fail proc() int {\n    return 9223372036854775807 + 1\n}\n", 4, 12, False),
-        ("fail proc() int {\n    a :: [42]\n    return a[1]\n}\n", 5, 12, False),
-        ("fail proc() int {\n    before :: after\n    after :: 42\n    return before\n}\n", 4, 15, False),
-        ("a int :: b\nb int :: a\nfail proc() int { return a }\n", 4, 10, False),
+        ("""
+            fail proc() int {
+                return `
+            }
+        """, 4, 12, True),
+        ("""
+            fail proc() int {
+                return (1
+            }
+        """, 4, 14, True),
+        ("""
+            fail proc() int {
+                text :: "é" return missing
+            }
+        """, 4, 25, True),
+        ("""
+            fail proc() int {
+                if (1) return 0
+                return 42
+            }
+        """, 4, 9, True),
+        ("""
+            fail proc() int {
+                return 9223372036854775808
+            }
+        """, 4, 12, True),
+        ("""
+            fail proc() int {
+                return 9223372036854775807 + 1
+            }
+        """, 4, 12, False),
+        ("""
+            fail proc() int {
+                a :: [42]
+                return a[1]
+            }
+        """, 5, 12, False),
+        ("""
+            fail proc() int {
+                before :: after
+                after :: 42
+                return before
+            }
+        """, 4, 15, False),
+        ("""
+            a int :: b
+            b int :: a
+            fail proc() int { return a }
+        """, 4, 10, False),
     ]
     for text, line, column, static in cases:
-        source.write_text("\n# utf8: é\n" + text)
+        source.write_text("\n# utf8: é\n" + textwrap.dedent(text).strip() + "\n")
         location = f"{source.resolve()}:{line}:{column}: ".encode()
         for reached in (False, True):
-            main.write_text(
-                'import "../bridge"\nmain proc() int {\n'
-                f'    if ({str(reached).lower()}) return bridge.fail()\n'
-                '    return 42\n}\n'
-            )
+            main.write_text(textwrap.dedent(f"""
+                import "../bridge"
+                main proc() int {{
+                    if ({str(reached).lower()}) return bridge.fail()
+                    return 42
+                }}
+            """).strip() + "\n")
             interpreted = run(str(HONEY), "run", str(app))
             assert interpreted.returncode == int(static or reached), outcome(interpreted)
             assert interpreted.stdout == (b"" if reached else b"42\n"), outcome(interpreted)