overhaul tests

test/apps/preloading/src/routes/_error.html

@@ -0,0 +1,3 @@
+<h1>{status}</h1>
+
+<p>{error.message}</p>

test/apps/preloading/src/routes/_layout.html

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+{#if preloading}
+	<progress class='preloading-progress' value=0.5/>
+{/if}
+
+<svelte:component this={child.component} {rootPreloadFunctionRan} {...child.props}/>
+
+<script>
+	export default {
+		preload() {
+			return {
+				rootPreloadFunctionRan: true
+			};
+		}
+	};
+</script>

test/apps/preloading/src/routes/foo.html

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+<h1>foo</h1>

test/apps/preloading/src/routes/index.html

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+<h1>Great success!</h1>
+
+<a href="slow-preload">slow preload</a>
+<a href="foo">foo</a>

test/apps/preloading/src/routes/preload-root/index.html

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+<h1>root preload function ran: {rootPreloadFunctionRan}</h1>

test/apps/preloading/src/routes/preload-values/custom-class.html

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+<h1>{foo.bar()}</h1>
+
+<script>
+	export default {
+		preload() {
+			class Foo {
+				bar() {
+					return 42;
+				}
+			}
+
+			return {
+				foo: new Foo()
+			};
+		}
+	};
+</script>

test/apps/preloading/src/routes/preload-values/index.html

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+<svelte:component this={child.component} {...child.props}/>

test/apps/preloading/src/routes/preload-values/set.html

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+<h1>{set.has('x')}</h1>
+
+<script>
+	export default {
+		preload() {
+			return {
+				set: new Set(['x'])
+			};
+		}
+	};
+</script>

test/apps/preloading/src/routes/slow-preload.html

@@ -0,0 +1,15 @@
+<h1>This page should never render</h1>
+
+<script>
+	export default {
+		preload() {
+			return new Promise(fulfil => {
+				if (typeof window !== 'undefined') {
+					window.fulfil = fulfil;
+				} else {
+					fulfil({});
+				}
+			});
+		}
+	};
+</script>