[add] tests

test.typ

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+// #import "@preview/tidy:0.3.0"
+#import "src/tidy.typ"
+
+#show raw.where(block: true): highlight
+
+#let module = ````
+/// #example(```
+/// [a #raw("foo") b]
+/// ```)
+let x = none
+
+/// #example(`[a #raw("foo") b]`)
+let y = none
+
+/// #example(raw(`[a #raw("foo") b]`.text), mode: "markup")
+let z = none
+
+/// #example(raw(lang: "typc", `[a #raw("foo") b]`.text))
+let ß = none
+````.text
+
+#let module = tidy.parse-module(
+  module,
+  // preamble: "set raw(block: false);"
+)
+#tidy.show-module(
+  module,
+  sort-functions: none,
+  style: tidy.styles.minimal,
+)

tests/.gitignore

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+# added by typst-test
+**/out/
+**/diff/

tests/show-example/test.typ

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+#set page(width: 170pt, height: auto, margin: 0pt)
+#import "/src/tidy.typ": show-example as example, render-examples
+#let show-example = example.show-example.with(
+    layout: (code, preview, ..sink) => {
+        grid(columns: (1fr, 1fr), align: horizon, code, preview)
+    }
+)
+#let almost-default-show-example = example.show-example.with(
+    layout: example.default-layout-example.with(
+        code-block: block.with(stroke: .5pt + luma(200)),
+        col-spacing: 0pt
+    )
+)
+
+#set block(below: 0pt)
+
+// All possible combinations of code and markup mode
+#show-example(`1`)
+#show-example(`#calc.sin(0)`)
+#show-example(raw("#calc.sin(0)"))
+#show-example(raw(lang: "typc", "calc.sin(0)"))
+#show-example(raw(lang: "typc", "calc.sin(0)", block: true))
+#show-example(raw(lang: "typ", "#calc.sin(0)"))
+#show-example(raw(lang: "typ", "a^2"), mode: "math")
+#show-example(raw(lang: "typm", "a^2"), mode: "math")
+
+#pagebreak()
+
+// Check that `raw` is not forced to block in the preview, see #21
+#show-example(`a #raw("foo") b`, mode: "markup")
+// Language should NOT default to typ in the preview, see #21
+#show-example(`#raw("#import")`, mode: "markup")
+
+#pagebreak()
+
+#show-example(`Fit that code in a tiny space`)
+
+#pagebreak()
+
+// Test ratio
+#almost-default-show-example(`Ratio .5`, ratio: .5)
+#pagebreak()
+
+// Test scale-preview
+#almost-default-show-example(`Fit that 200%`, scale-preview: 200%)
+#almost-default-show-example(`Fit that 50%`, scale-preview: 50%)
+#pagebreak()
+
+
+// Test direction
+#almost-default-show-example(`#ltr`, dir: ltr)
+#pagebreak()
+#almost-default-show-example(`#ttb`, dir: ttb)
+
+#pagebreak()
+
+// The auto-shower, see #15
+
+#[
+    #show: render-examples
+
+    ```example
+    #rect(height: 3pt)
+    ```
+]
+
+#pagebreak()
+
+
+#[
+    #set page(width: auto, height: auto, margin: 0pt)
+    #show: render-examples.with(layout: (code, preview) => grid(columns: 2, align: horizon, code, preview))
+
+    ```example
+    #rect(height: 3pt)
+    ```
+]