Add first cut at some tests

tests/project-root1.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+cd "$DIR"/.. || exit
+
+source ./_reformat-common.bash
+
+setUp() {
+    cd "$DIR"/.. || exit
+}
+
+testProjectRoot001() {
+    dir=$(mktemp -d --tmpdir would-reformat-testProjectRoot001.XXXXXX)
+    cd "$dir" || exit
+    git init >/dev/null 2>&1
+
+    echo 'abc123' >random-file
+
+    pr=$(project_root random-file)
+
+    assertEquals "$dir" "$pr"
+}
+
+# This won't work (yet) because our only method of determining a
+# project root is to ask git what it thinks.
+testProjectRoot002() {
+    dir=$(mktemp -d --tmpdir would-reformat-testProjectRoot001.XXXXXX)
+    cd "$dir" || exit
+
+    echo 'abc123' >random-file
+
+    pr=$(project_root random-file)
+
+    assertEquals "" "$pr"
+}
+
+# shellcheck disable=SC1091
+source shunit2