Add initial tests

test/runtime/samples/error-handling-bubble-to-parent-manually/_config.js

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+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-bubble-to-parent-manually/child.svelte

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+<script>
+    import { onError } from "svelte";
+
+    onError(e => {
+        throw e;
+    });
+
+    var a = {};
+    console.log(a.b.c);
+</script>

test/runtime/samples/error-handling-bubble-to-parent-manually/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var error = false;
+
+    onError(e => {
+        error = true;
+    });
+</script>

test/runtime/samples/error-handling-bubble-to-parent/_config.js

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+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-bubble-to-parent/child.svelte

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+<script>
+    var a = {};
+    console.log(a.b.c);
+</script>

test/runtime/samples/error-handling-bubble-to-parent/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var error = false;
+
+    onError(e => {
+        error = true;
+    });
+</script>

test/runtime/samples/error-handling-catch-after-error/_config.js

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+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-catch-after-error/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {};
+    export var error = false;
+
+    a.b.c
+
+    onError(e => {
+        error = true;
+    });
+</script>

test/runtime/samples/error-handling-catch-before-error/_config.js

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+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-catch-before-error/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {};
+    export var error = false;
+
+    onError(e => {
+        error = true;
+    });
+
+    a.b.c
+</script>

test/runtime/samples/error-handling-event-correct-this/_config.js

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+export default {
+    async test({ assert, component, target, window }) {
+        const button = target.querySelector('button');
+        const event = new window.MouseEvent('click');
+
+        await button.dispatchEvent(event);
+
+        assert.equal(component.error, true);
+        assert.equal(component.that, button);
+    }
+}

test/runtime/samples/error-handling-event-correct-this/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {};
+    var that;
+    export var error = false;
+
+    onError(e => {
+        error = true;
+    });
+
+    function clickEvent() {
+        that = this;
+        console.log(a.b.c);
+    }
+</script>
+
+<button on:click={clickEvent}></button>

test/runtime/samples/error-handling-event/_config.js

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+export default {
+    async test({ assert, component, target, window }) {
+        const button = target.querySelector('button');
+        const event = new window.MouseEvent('click');
+
+        await button.dispatchEvent(event);
+
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-event/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {};
+    export var error = false;
+
+    onError(e => {
+        error = true;
+    });
+
+    function clickEvent() {
+        console.log(a.b.c);
+    }
+</script>
+
+<button on:click={clickEvent}></button>

test/runtime/samples/error-handling-template-reactive/_config.js

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+export default {
+    async test({ assert, component, target, window }) {
+        const button = target.querySelector('button');
+        const event = new window.MouseEvent('click');
+
+        await button.dispatchEvent(event);
+
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-template-reactive/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {
+        b: {
+            c: 10
+        }
+    };
+    export var error = false;
+
+    onError(e => {
+        error = true;
+    });
+
+    function causeError() {
+        a = {};
+    }
+</script>
+
+{a.b.c}
+
+<button on:click={causeError}></button>

test/runtime/samples/error-handling-template/_config.js

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+export default {
+    test({ assert, component }) {
+        assert.equal(component.error, true);
+    }
+}

test/runtime/samples/error-handling-template/main.svelte

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+<script>
+    import { onError } from "svelte";
+
+    var a = {};
+    export var error = false;
+
+    onError(e => {
+        error = true;
+    });
+</script>
+
+{a.b.c}