add tests

Author: kindly

fixtures/only_null_field.json

@@ -0,0 +1,5 @@
+[
+    {
+        "a": null
+    }
+]

fixtures/only_null_fields.csv

@@ -0,0 +1,2 @@
+table_name,field_name,field_type,field_title,count
+main,a,text,a,1

src/snapshots/libflatterer__tests__only_null_field.json-datapackage.json.snap

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+---
+source: src/lib.rs
+expression: "&value"
+snapshot_kind: text
+---
+profile: tabular-data-package
+resources:
+  - profile: tabular-data-resource
+    name: main
+    flatterer_name: main
+    title: main
+    schema:
+      fields:
+        - name: _link
+          title: _link
+          type: string
+          format: string
+          count: 1
+          stats:
+            min_len: 1
+            max_len: 1
+            min_str: "0"
+            max_str: "0"
+            count: 1
+            empty_count: 0
+            exact_unique: 1
+            estimate_unique: ~
+            top_20:
+              - - "0"
+                - 1
+            sum: ~
+            mean: ~
+            variance: ~
+            stddev: ~
+            min_number: ~
+            max_number: ~
+            median: ~
+            lower_quartile: ~
+            upper_quartile: ~
+            deciles: 0
+            centiles: 0
+        - name: a
+          title: a
+          type: boolean
+          format: boolean
+          count: 1
+          stats:
+            min_len: ~
+            max_len: ~
+            min_str: ~
+            max_str: ~
+            count: 0
+            empty_count: 1
+            exact_unique: ~
+            estimate_unique: 0
+            top_20: ~
+            sum: ~
+            mean: ~
+            variance: ~
+            stddev: ~
+            min_number: ~
+            max_number: ~
+            median: ~
+            lower_quartile: ~
+            upper_quartile: ~
+            deciles: 0
+            centiles: 0
+      primaryKey: _link
+    path: csv/main.csv

src/snapshots/libflatterer__tests__only_null_field.json-fieldscsv-datapackage.json.snap

@@ -0,0 +1,69 @@
+---
+source: src/lib.rs
+expression: "&value"
+snapshot_kind: text
+---
+profile: tabular-data-package
+resources:
+  - profile: tabular-data-resource
+    name: main
+    flatterer_name: main
+    title: main
+    schema:
+      fields:
+        - name: _link
+          title: _link
+          type: string
+          format: string
+          count: 1
+          stats:
+            min_len: 1
+            max_len: 1
+            min_str: "0"
+            max_str: "0"
+            count: 1
+            empty_count: 0
+            exact_unique: 1
+            estimate_unique: ~
+            top_20:
+              - - "0"
+                - 1
+            sum: ~
+            mean: ~
+            variance: ~
+            stddev: ~
+            min_number: ~
+            max_number: ~
+            median: ~
+            lower_quartile: ~
+            upper_quartile: ~
+            deciles: 0
+            centiles: 0
+        - name: a
+          title: a
+          type: string
+          format: string
+          count: 1
+          stats:
+            min_len: ~
+            max_len: ~
+            min_str: ~
+            max_str: ~
+            count: 0
+            empty_count: 1
+            exact_unique: ~
+            estimate_unique: 0
+            top_20: ~
+            sum: ~
+            mean: ~
+            variance: ~
+            stddev: ~
+            min_number: ~
+            max_number: ~
+            median: ~
+            lower_quartile: ~
+            upper_quartile: ~
+            deciles: 0
+            centiles: 0
+      primaryKey: _link
+    path: csv/main.csv

src/snapshots/libflatterer__tests__only_null_field.json-fieldscsv-fields.csv.snap

@@ -0,0 +1,8 @@
+---
+source: src/lib.rs
+expression: output
+snapshot_kind: text
+---
+- "table_name,field_name,field_type,field_title,count"
+- "main,_link,text,_link,1"
+- "main,a,text,a,1"

src/snapshots/libflatterer__tests__only_null_field.json-fieldscsv-tables.csv.snap

@@ -0,0 +1,7 @@
+---
+source: src/lib.rs
+expression: output
+snapshot_kind: text
+---
+- "table_name,table_title"
+- "main,main"