[guess-root] add tests to document the behavior of preexisting commands.

Summary: This test documents how some commands use invalid roots as the starting place for searching for a valid root while others just reject the invalid root. It also provides a usage of the type-at-pos command where the optional file argument has been elided.

Reviewed By: mvitousek

Differential Revision: D15582376

fbshipit-source-id: 5851d038684e35d87f9729da29b38e91af12ed9e

Author: Andre Kuhlenschmidt

tests/guess-root/.testconfig

@@ -0,0 +1,2 @@
+shell: test.sh
+auto_start: false

tests/guess-root/config/.flowconfig

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+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+
+[options]
+
+[strict]

tests/guess-root/config/no-config/d2.js

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+// @flow
+
+let y = 0;
+function f(x = y) {}
+function g({x = y}) {}

tests/guess-root/d0.js

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+// @flow
+
+let y = 0;
+function f(x = y) {}
+function g({x = y}) {}

tests/guess-root/guess-root.exp

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+nothing
+with file
+with file and config
+number
+no-config/d2.js:3:5,3:5
+with bad root directory
+number
+-:3:5,3:5
+with bad root directory, and file
+number
+no-config/d2.js:3:5,3:5
+with bad root directory, and file
+number
+no-config/d2.js:3:5,3:5
+with file batch coverage
+
+Coverage results from 1 file(s):
+
+no-config/d2.js: 88.89% (8 of 9 expressions)
+
+-----------------------------------
+Aggregate coverage statistics
+-----------------------------------
+Files                : 1
+Expressions          :
+  Covered            : 8
+  Total              : 9
+  Covered Percentage : 88.89%
+
+with bad root directory, and file batch coverage

tests/guess-root/no-config/d1.js

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+// @flow
+
+let y = 0;
+function f(x = y) {}
+function g({x = y}) {}

tests/guess-root/test.sh

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+#!/bin/bash
+
+echo "nothing"
+assert_exit "$EXIT_COULD_NOT_FIND_FLOWCONFIG" "$FLOW" type-at-pos 3 5 < d0.js
+
+echo "with file"
+assert_exit "$EXIT_COULD_NOT_FIND_FLOWCONFIG" "$FLOW" type-at-pos no-config/d1.js 3 5
+
+echo "with file and config"
+assert_ok "$FLOW" type-at-pos --strip-root config/no-config/d2.js 3 5
+
+echo "with bad root directory"
+assert_ok "$FLOW" type-at-pos --root ./config/no-config 3 5 < ./config/no-config/d2.js
+
+echo "with bad root directory, and file"
+assert_ok "$FLOW" type-at-pos --strip-root --root ./config/no-config ./config/no-config/d2.js 3 5
+
+echo "with bad root directory, and file"
+assert_ok "$FLOW" type-at-pos --strip-root --root ./config/no-config ./config/no-config/d2.js 3 5
+
+echo "with file batch coverage"
+assert_ok "$FLOW" batch-coverage --strip-root ./config/no-config/d2.js
+
+echo "with bad root directory, and file batch coverage"
+assert_exit "$EXIT_COULD_NOT_FIND_FLOWCONFIG" "$FLOW" batch-coverage --root ./config/no-config ./config/no-config/d2.js